Prosper Funding 10-K6 Apr 152014 FY Annual reportFinancial data

Company Profile

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
Document and Entity Information (USD $)	Dec. 31, 2014	Mar. 30, 2015	Jun. 30, 2014
Document And Entity Information [Line Items]
Entity Registrant Name	PROSPER MARKETPLACE INC
Entity Central Index Key	1416265
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$59,433,000
Entity Common Stock, Shares Outstanding		14,869,215
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	FALSE
Document Period End Date	31-Dec-14
Prosper Funding LLC [Member]
Document And Entity Information [Line Items]
Entity Registrant Name	Prosper Funding LLC
Entity Central Index Key	1542574
Current Fiscal Year End Date	-19
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Smaller Reporting Company
Entity Public Float			$0
Entity Common Stock, Shares Outstanding		0

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
ASSETS
Cash and Cash Equivalents	$50,557	$18,339
Restricted Cash	81,300	49,824
Short Term Investments	1,274	1,271
Accounts Receivable	3,152	296
Loans Held for Sale, at Fair Value	8,463	3,206
Borrower Loans, at Fair Value	273,243	233,105
Property and Equipment, Net	14,424	3,026
Prepaid and Other Assets	7,745	1,192
Total Assets	440,158	310,259
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities	17,239	3,388
Payable to Investors	64,494	38,025
Class Action Settlement Liability	7,861	9,739
Notes, at Fair Value	273,783	234,218
Repurchase Liability for Unvested Restricted Stock Awards	1,010	559
Total Liabilities	364,387	285,929
Commitments and Contingencies (see Note 12)
Convertible Preferred Stock â€“ $0.01 par value; 32,155,022 shares authorized; 30,699,957 issued and outstanding as of December 31, 2014. 27,274,068 shares authorized, issued and outstanding as of December 31, 2013, respectively. Aggregate liquidation preference of $160,952 and $96,172 as of December 31, 2014 and December 31, 2013, respectively.	111,145	44,822
Stockholders' Equity (Deficit)
Common Stock --$0.01 par value; 47,928,883 shares authorized; 14,448,700 shares issued and outstanding as of December 31, 2014; 41,487,465 shares authorized; 13,588,803 issued and outstanding as of December 31, 2013	102	75
Additional Paid-In Capital	86,340	83,676
Less: Treasury Stock	-303	-291
Accumulated Deficit	-121,513	-103,952
Total Stockholders' Equity (Deficit)	-35,374	-20,492
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)	440,158	310,259
Prosper Funding LLC [Member]
ASSETS
Cash and Cash Equivalents	23,777	5,789
Restricted Cash	73,103	46,650
Short Term Investments	1,274	1,271
Loans Held for Sale, at Fair Value	8,463	3,206
Borrower Loans, at Fair Value	273,243	233,104
Property and Equipment, Net	1,125	1,610
Other Assets	3,120	443
Related Party Receivable	1,135
Total Assets	385,240	292,073
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities	1,357	405
Payable to Investors	63,809	38,021
Notes, at Fair Value	273,783	234,218
Related Party Payable		205
Total Liabilities	338,949	272,849
Stockholders' Equity (Deficit)
Member's Equity	29,619	15,836
Accumulated Deficit	16,672	3,388
Total Stockholders' Equity (Deficit)	46,291	19,224
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)	$385,240	$292,073

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Statement Of Financial Position [Abstract]
Convertible preferred stock, par value (in dollars per share)	$0.01	$0.01
Convertible preferred stock, shares authorized (in shares)	32,155,022	27,274,068
Convertible preferred stock, shares issued (in shares)	30,699,957	27,274,068
Convertible preferred stock, shares outstanding (in shares)	30,699,957	27,274,068
Convertible preferred stock, aggregate liquidation preference	$160,952	$96,172
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized (in shares)	47,928,883	41,487,465
Common stock, shares issued (in shares)	14,448,700	13,588,803
Common stock, shares outstanding (in shares)	14,448,700	13,588,803

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014
Operating Revenues
Transaction Fees, Net	$68,229
Servicing Fees, Net	4,552
Other Revenues	5,055
Total Operating Revenues	77,836
Interest Income
Interest Income on Borrower Loans	42,087
Interest Expense on Notes	-38,734
Net Interest Income	3,353
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	128
Total Net Revenues	81,317
Expenses
Origination and Servicing	14,098
Sales and Marketing	41,971
General and Administrative	27,917
Total Expenses	83,986
Net Income (Loss)	-2,669
Excess Return to Preferred Shareholders on Repurchase	-14,892
Net Loss Applicable to Common Shareholders	-17,561
Net Loss Per Share â€“ Basic and Diluted	($1.97)
Weighted-Average Shares - Basic and Diluted Net Loss Per Share	8,896,801
Prosper Funding LLC [Member]
Operating Revenues
Administration Fee Revenue â€“ Related Party	28,519
Servicing Fees, Net	4,168
Other Revenues	3,733
Total Operating Revenues	36,420
Interest Income
Interest Income on Borrower Loans	42,370
Interest Expense on Notes	-38,734
Net Interest Income	3,636
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	209
Total Net Revenues	40,265
Expenses
Servicing	4,615
Administration Fee â€“ Related Party	21,860
General and Administrative	506
Total Expenses	26,981
Net Income (Loss)	$13,284

Consolidated_Statements_of_Con

Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity (USD $)	Total	Prosper Funding LLC [Member]	Restricted Stock	Convertible Preferred Stock [Member]	Common Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Accumulated Deficit [Member]	Member's Equity [Member]
In Thousands, except Share data	USD ($)	USD ($)	USD ($)	USD ($)	USD ($)	Restricted Stock	USD ($)	Restricted Stock	USD ($)	USD ($)	Prosper Funding LLC [Member]	Prosper Funding LLC [Member]
								USD ($)			USD ($)	USD ($)
Balance at Dec. 31, 2012 (Previously Stated [Member])	$6,037			$72	$5		($291)		$83,150	($76,899)
Balance (Adjustment [Member])	-80,370			80,269					-80,252	-46
Balance at Dec. 31, 2012	-74,333	5					-291
Balance (in shares) at Dec. 31, 2012 (Previously Stated [Member])				7,195,813	482,938		-182,264
Balance (in shares) at Dec. 31, 2012							-182,264
Net Income (Loss)	-4,170	239
Net Income (Loss) at Jan. 01, 2013 (Previously Stated [Member])	-4,199	187
Net Income (Loss) (Adjustment [Member])	29	52
Balance at Mar. 31, 2013
Balance at Dec. 31, 2012 (Previously Stated [Member])	6,037			72	5		-291		83,150	-76,899
Balance (Adjustment [Member])	-80,370			80,269					-80,252	-46
Balance at Dec. 31, 2012	-74,333	5		80,341	5		-291		2,898	-76,945	-205	210
Balance (in shares) at Dec. 31, 2012 (Previously Stated [Member])				7,195,813	482,938		-182,264
Balance (in shares) at Dec. 31, 2012				7,195,813	482,938		-182,264
Issuance of convertible preferred stock, new Series A, net of issuance costs				19,840
Issuance of convertible preferred stock, new Series A, net of issuance costs (in shares)				13,868,152
Issuance of convertible preferred stock Series A-1				51
Issuance of convertible preferred stock Series A-1 (in shares)				5,117,182
Issuance of convertible preferred stock, new Series B, net of issuance costs				24,931
Issuance of convertible preferred stock, new Series B, net of issuance costs (in shares)				8,288,734
Conversion of Preferred Series A-F	80,341			-80,341	62				80,279
Conversion of Preferred Series A-F (in shares)				-7,195,813	6,191,270
Exercise of vested stock options	210				8				202
Exercise of vested stock options (in shares)					828,496
Exercise of nonvested stock options (in shares)					6,499,463
Repurchase of stock (in shares)						-414,184
Exercise of common stock warrants (in shares)					820
Restricted stock vested	51								51
Stock-based compensation expense	246								246
Net Income (Loss)	-27,007	3,593								-27,007	3,593
Net Income (Loss) at Jan. 01, 2013 (Previously Stated [Member])	-27,181	3,623
Net Income (Loss) (Adjustment [Member])	174	-30
Transfer of Assets from PMI		5,649										5,649
Capital Infusion from Parent		10,001										10,001
Transfer of Servicing Rights to Parent		-24										-24
Balance at Dec. 31, 2013 (Previously Stated [Member])	24,117	19,494
Balance (Adjustment [Member])	-44,609	-270
Balance at Dec. 31, 2013	-20,492	19,224		44,822	75		-291		83,676	-103,952	3,388	15,836
Balance (in shares) at Dec. 31, 2013 (Previously Stated [Member])	13,902,478
Balance (in shares) (Adjustment [Member])	13,588,803
Balance (in shares) at Dec. 31, 2013				27,274,068	13,588,803		-182,264
Balance at Sep. 30, 2013
Net Income (Loss)	-2,329	1,641
Net Income (Loss) (Adjustment [Member])	35	-38
Balance (Adjustment [Member])	-44,609	-270
Balance at Dec. 31, 2013	-20,492	19,224					-291
Balance (in shares) (Adjustment [Member])	13,588,803
Balance (in shares) at Dec. 31, 2013							-182,264
Balance at Dec. 31, 2013 (Previously Stated [Member])	24,117	19,494
Balance (in shares) at Dec. 31, 2013 (Previously Stated [Member])	13,902,478
Net Income (Loss)	-2,718	1,648
Net Income (Loss) at Jan. 01, 2014 (Previously Stated [Member])	-2,166	2,088
Net Income (Loss) (Adjustment [Member])	-552	-440
Balance at Mar. 31, 2014
Balance at Dec. 31, 2013	-20,492	19,224		44,822	75		-291		83,676	-103,952	3,388	15,836
Balance (in shares) at Dec. 31, 2013				27,274,068	13,588,803		-182,264
Issuance Of Convertible Preferred Stock Series C'14, net of issuance costs				69,958
Issuance Of Convertible Preferred Stock Series C'14, net of issuance costs (in shares)				4,880,954
Exercise of vested stock options	77				1				76
Exercise of vested stock options (in shares)					59,150
Exercise of nonvested stock options (in shares)					865,717
Repurchase of stock	-14,892		-12	-3,635				-12		-14,892
Repurchase of stock (in shares)				-1,455,065		-181,893		-4,923
Restricted stock vested	345				25				320
Exercise of warrants	227				1				226
Exercise of warrants (in shares)					116,923
Stock-based compensation expense	2,042								2,042
Net Income (Loss)	-2,669	13,284								-2,669	13,284
Capital Infusion from Parent		15,000										15,000
Transfer of Servicing Rights to Parent		-1,217										-1,217
Balance at Dec. 31, 2014	($35,374)	$46,291		$111,145	$102		($303)		$86,340	($121,513)	$16,672	$29,619
Balance (in shares) at Dec. 31, 2014				30,699,957	14,448,700		-187,187

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Cash Flows from Operating Activities:
Net Income (Loss)	($2,669)
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868
Change in Fair Value of Loans Held For Sale	-73
Change in Fair Value of Notes	-16,391
Depreciation and Amortization	2,097
Change in Servicing Rights	-3,256
Stock-Based Compensation Expense	2,042
Loss on Impairment of Property and Equipment	322
Accretion of Class Action Settlement Liability	122
Purchase of Loans Held for Sale at Fair Value	-1,416,809
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145
Accounts Receivable	-2,856
Prepaid and Other Assets	-2,840
Accounts Payable and Accrued Liabilities	11,844
Class Action Settlement Liability	-2,000
Payable to Investors	26,219
Net cash provided by (used in) Operating Activities	-2,900
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088
Principal Payments of Borrower Loans Held at Fair Value	121,082
Purchases of Property and Equipment	-12,267
Maturities of Short Term Investments	1,271
Purchases of Short Term Investments	-1,274
Changes in Restricted Cash Related to Investing Activities	-5,081
Net Cash Used in Investing Activities	-73,357
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865
Payment of Notes Held at Fair Value	-120,909
Proceeds from Issuance of Convertible Preferred Stock, Net	69,958
Proceeds from Early Exercise of Stock Options	814
Repurchase of Restricted Stock	-30
Proceeds from Exercise of Vested Stock Options	77
Proceeds from Exercise of Common Stock Warrants	227
Repurchase of Preferred Stock	-18,527
Net Cash Provided by Financing Activities	108,475
Proceeds from Exercise of Vested Stock Options	77
Net Increase (Decrease) in Cash and Cash Equivalents	32,218
Cash and Cash Equivalents at Beginning of the Year	18,339
Cash and Cash Equivalents at End of the Year	50,557
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	41,053
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	1,550
Prosper Funding LLC [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	13,284
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868
Change in Fair Value of Loans Held For Sale	-73
Change in Fair Value of Notes	-16,391
Depreciation and Amortization	1,331
Change in Servicing Rights	-3,440
Purchase of Loans Held for Sale at Fair Value	-1,416,809
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145
Other Assets	3
Accounts Payable and Accrued Liabilities	495
Payable to Investors	25,538
Net Related Party Payable	-1,340
Net cash provided by (used in) Operating Activities	3,946
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088
Principal Payments of Borrower Loans Held at Fair Value	121,081
Purchases of Property and Equipment	-846
Maturities of Short Term Investments	-1,274
Purchases of Short Term Investments	1,271
Changes in Restricted Cash Related to Investing Activities	-58
Net Cash Used in Investing Activities	-56,914
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865
Payment of Notes Held at Fair Value	-120,909
Net Cash Provided by Financing Activities	70,956
Memberâ€™s Equity Capital Infusion from Parent	15,000
Net Increase (Decrease) in Cash and Cash Equivalents	17,988
Cash and Cash Equivalents at Beginning of the Year	5,789
Cash and Cash Equivalents at End of the Year	23,777
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	41,053
Non-Cash Financing Activity, Distribution to Parent	$1,228

Organization_and_Business

Organization and Business	12 Months Ended
	Dec. 31, 2014
Organization and Business	1	Organization and Business
	Prosper Marketplace, Inc. (“Prosper”, “PMI” or “the Company”) was incorporated in the state of Delaware on March 22, 2005. Prosper developed a peer-to-peer online credit marketplace (the “marketplace”) and prior to February 1, 2013, owned the proprietary technology that made operation of the marketplace possible. Prior to February 1, 2013, PMI also operated the marketplace, facilitated the origination of unsecured, consumer loans by WebBank (“Borrower Loans”), an FDIC-insured, Utah-chartered industrial bank, through the marketplace and issued and sold borrower payment dependent notes corresponding to those Borrower Loans.
	The marketplace is designed to allow investor members to invest in borrower loans in an open transparent marketplace, with the aim of allowing both investor members and borrower members to profit financially as well as socially. The Company believes marketplace lending represents a new model of consumer lending, where individuals and institutions can earn the interest spread of a traditional consumer lender but must also assume the credit risk of a traditional consumer lender.
	A borrower member who wishes to obtain a Borrower Loan through the marketplace must post a Borrower Loan listing, on the marketplace. Listings are allocated to one of two investor member funding channels: (i) the first channel allows investor members to commit to purchase a participating interest in a Borrower Loan which is referred to as a Note, the payments of which are dependent on the payments made on the corresponding Borrower Loan (the “Note Channel”); and (ii) the second channel allows investor members to commit to purchase 100% of a Borrower Loan directly from the Company (the “Whole Loan Channel”).
	As of December 31, 2014, the marketplace is open to investors in 31 states and the District of Columbia. Additionally, as of December 31, 2014 the marketplace is open to borrowers in 46 states and the District of Columbia. Currently our marketplace is not offered internationally.
	On February 1, 2013, PMI transferred ownership of the marketplace, including all of the rights related to the operation of the marketplace, as well as all then-outstanding Borrower Loans, to its wholly-owned subsidiary, Prosper Funding LLC (“PFL” and, collectively with PMI, the “Company” or the “Registrants”). At that same time, PFL assumed all of PMI’s obligations with respect to all then-outstanding Notes. Since February 1, 2013, all Notes issued and sold through the marketplace are issued and sold by PFL. Pursuant to a Loan Account Program Agreement between PMI and WebBank, PMI manages the operation of the marketplace, as agent of WebBank, in connection with the submission of loan applications by potential borrowers, the making of related loans by WebBank and the funding of such Borrower Loans by WebBank. On February 1, 2013, PFL entered into an Administration Agreement with PMI in its capacity as licensee, corporate administrator, loan marketplace administrator and loan and note servicer, pursuant to which PMI provides certain back office support, loan marketplace administration and loan and note servicing to PFL.
	PFL formed Prosper Asset Holdings LLC (“PAH”) in November 2013 as a limited liability company with the sole equity member being PFL. PAH was formed to purchase Borrower Loans directly from PFL and sell the Borrower Loans to third parties.

Prosper Funding LLC [Member]
Organization and Business	1	Organization and Business
	Prosper Funding LLC (“PFL”) was formed in the state of Delaware in February 2012 as a limited liability company with the sole equity member being Prosper Marketplace, Inc. (“PMI”).
	PFL was formed by PMI to hold Borrower Loans and issue Notes through the marketplace. Although PFL is consolidated with PMI for accounting and tax purposes, PFL has been organized and is operated in a manner that is intended to minimize the likelihood that it would be substantively consolidated with PMI in a bankruptcy proceeding. PFL’s intention is to minimize the likelihood that its assets would be subject to claims by PMI’s creditors if PMI were to file for bankruptcy, as well as to minimize the likelihood that PFL will become subject to bankruptcy proceedings directly. PFL seeks to achieve this by placing certain restrictions on its activities and implementing certain formal procedures designed to expressly reinforce its status as a distinct corporate entity from PMI.
	On January 22, 2013, PMI entered into an Asset Transfer Agreement with PFL pursuant to which PMI transferred substantially all of its remaining assets to PFL, including (i) all outstanding Notes issued by PMI under the Indenture dated June 15, 2009 between PMI and Wells Fargo Bank, as trustee, (ii) all Borrower Loans held by PMI, (iii) all lender/borrower/group leader registration agreements related to such Notes or Borrower Loans, and (iv) all documents and information related to the foregoing, effective February 1, 2013.
	PFL commenced operations as of February 1, 2013 when PMI transferred ownership of the marketplace, including all of the rights related to the operation of the marketplace, to PFL. Since February 1, 2013, all Notes issued and sold through the marketplace are issued, sold and serviced by PFL. Pursuant to a Loan Account Program Agreement between PMI and WebBank, PMI manages the operation of the marketplace, as agent of WebBank, in connection with the submission of Borrower Loan applications by potential borrowers, the making of related Borrower Loans by WebBank and the funding of such Borrower Loans by WebBank. Pursuant to an Administration Agreement between PFL and PMI, PMI manages all other aspects of the marketplace on behalf of PFL.
	A borrower member who wishes to obtain a loan through the marketplace must post a loan listing, or listing, on the marketplace. PFL allocates listings to one of two investor member funding channels: (i) the first channel allows investor members to commit to purchase Notes, the payments of which are dependent on the payments made on the corresponding Borrower Loan (the “Note Channel”); and (ii) the second channel allows investor members to commit to purchase 100% of a Borrower Loan directly from the Company (the “Whole Loan Channel”).
	All loans requested and obtained through the marketplace are unsecured obligations of individual borrower members with a fixed interest rate and loan terms set at three or five years as of December 31, 2014. All loans made through the marketplace are funded by WebBank, an FDIC-insured, Utah chartered industrial bank. After funding a loan, WebBank sells the loan to PFL, without recourse to WebBank, in exchange for the principal amount of the loan. WebBank does not have any obligation to purchasers of the Notes.
	PFL’s marketplace is designed to allow investor members to invest in Borrower Loans in an open transparent marketplace, with the aim of allowing both investor members and borrower members to profit financially as well as socially. PFL believes marketplace lending represents a new model of consumer lending, where individuals and institutions can earn the interest spread of a traditional consumer lender but must also assume the credit risk of a traditional consumer lender.
	A borrower member who wishes to obtain a Borrower Loan through PFL’s marketplace must post a loan listing to the marketplace. Listings are allocated to one of two investor member funding channels: (i) the Note Channel, which allows investor members to commit to purchase a Note from PFL, the payments of which are dependent on the payments made on the corresponding Borrower Loan; and (ii) the Whole Loan Channel, which allows investor members to commit to purchase Borrower Loans in their entirety directly from PFL.
	As of December 31, 2014, PFL’s marketplace was open to investors in 31 states and the District of Columbia. Additionally, as of December 31, 2014 PFL’s marketplace was open to borrowers in 46 states and the District of Columbia. Currently, PFL’s marketplace is not offered internationally.
	PFL formed Prosper Asset Holdings LLC (“PAH”) in November 2013 as a limited liability company with the sole equity member being PFL. PAH was formed to purchase Borrower Loans directly from PFL and sell the Borrower Loans to third parties.

Summary_of_Significant_Account

Summary of Significant Accounting Policies

12 Months Ended

Dec. 31, 2014

Significant Accounting Policies [Line Items]

Summary of Significant Accounting Policies

Basis of Presentation

The accompanying consolidated financial statements include the accounts of Prosper Marketplace Inc. and its wholly owned subsidiary Prosper Funding LLC. All intercompany balances and transactions between PFL and PMI have been eliminated in consolidation. PMI and PFL’s financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).

Use of Estimates

The preparation of the consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures, including contingent liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting periods. These estimates, judgments and assumptions include but are not limited to the following: valuation of Loans Held for Sale, Borrower Loans and associated Notes, valuation of servicing rights, valuation allowance on deferred tax assets, stock-based compensation expense, and contingent liabilities. Actual results could differ from those estimates, and those differences could be material.

Certain Risks

In the normal course of its business, the Company encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject the Company to significant concentrations of credit risk consist primarily of cash, cash equivalents, and restricted cash. The Company places cash, cash equivalents, and restricted cash with high-quality financial institutions and is exposed to credit risk in the event of default by these institutions to the extent the amount recorded on the balance sheet exceeds federally insured amounts. The Company performs periodic evaluations of the relative credit standing of these financial institutions and has not sustained any credit losses from instruments held at these financial institutions.

To the extent that payments on Borrower Loans (including Borrower Loans that have been sold) are not made, interest income and/or servicing income will be reduced. A series of Notes corresponding to a particular Borrower Loan is wholly dependent on the repayment of such Borrower Loan. As a result, the Company does not bear the risk on such Borrower Loan.

The Company is subject to various regulatory requirements. The failure to appropriately identify and address these regulatory requirements could result in certain discretionary actions by regulators that could have a material effect on the Company’s consolidated financial position and results of operations (See Note 11—Commitments and Contingencies—Securities Law Compliance).

Reclassifications

During the year ended December 31, 2014, the Company changed the presentation of its revenues in the consolidated statement of operations. A new line called “Servicing Fees, Net” was created and the servicing fees related to Borrower Loans sold directly to third parties that were previously included in interest income were reclassified to this new line. Furthermore, the “Rebates and Promotions” line was removed, with the amounts in that line reclassified to the “Servicing Fees, Net” or “Transaction Fees, Net” or “Other Revenues” lines based on the underlying transactions. Also, the “Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net” was moved into the total revenues subtotal. The Company also changed the definitions used to classify expenses. Expenses were previously classified as cost of services, compensation and benefits, marketing and advertising, depreciation and amortization, professional services, facilities and maintenance, class action settlement, loss on impairment of fixed assets and other. The revised classification approach replaces the previous classifications with origination and servicing, sales and marketing, and general and administration. The changes had no impact to the total expenses or net income. Prior period amounts have been reclassified to conform to the current presentation. Lastly, the subtotals were realigned to reflect the new presentation. Management believes these changes make the income statement more useful for the readers of the financial statements and comparable with the Company’s competitors.

Consolidation of Variable Interest Entities

The determination of whether to consolidate a variable interest entity (“VIE”) in which we have a variable interest requires a significant amount of analysis and judgment whether we are the primary beneficiary of a VIE via a controlling financial interest in the VIE. A controlling financial interest in a VIE exists if we have both the power to direct the VIE’s activities that most significantly affect the VIE’s economic performance and a potentially significant economic interest in the VIE. The determination of whether an entity is a VIE considers factors, such as (i) whether the entity’s equity investment at risk is insufficient to allow the entity to finance its activities without additional subordinated financial support or (ii) when a holder’s equity investment at risk lacks any of the following characteristics of a controlling financial interest: the direct or indirect ability through voting rights or similar rights to make decisions about a legal entity’s activities that have a significant effect on the entity’s success, the obligation to absorb the expected losses of the entity or the right to receive the expected residual returns of the legal entity.

As a result of the nature of the retained servicing rights on the sale of Borrower Loans, we are a variable interest holder in certain special purposes entities that purchase these Borrower Loans. For all of these entities we either do not have the power to direct the activities that most significantly affect the VIE’s economic performance or we do not have a potentially significant economic interest in the VIE. In no case are we the primary beneficiary and as a result none of these entities are consolidated on the Company’s consolidated financial statements.

Management regularly reviews and reconsiders its previous conclusions regarding the status of an entity as a VIE and whether we are required to consolidate such VIE in the consolidated financial statements.

Cash and Cash Equivalents

Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking accounts.

Restricted Cash

Restricted cash consists primarily of cash deposits and short term certificate of deposit accounts held as collateral as required for long term leases, loan funding and servicing activities, and cash that investors or the Company has on our marketplace that has not yet been invested in loans or disbursed to the investor.

Short Term Investments

Short term investments consists of certificates of deposit with a term greater than three months but less than a year that are held as collateral as required for loan funding and servicing activities.

Fair Value Measurement

The Company adopted Accounting Standards Codification (“ASC”) Topic 820, Fair Value Measurements and Disclosures (“ASC Topic 820”), which provides a framework for measuring the fair value of assets and liabilities. ASC Topic 820 also provides guidance regarding a fair value hierarchy, which prioritizes information used to measure fair value and the effect of fair value measurements on earnings and provides for enhanced disclosures determined by the level within the hierarchy of information used in the valuation. ASC Topic 820 applies whenever other standards require (or permit) assets or liabilities to be measured at fair value.

ASC Topic 820 defines fair value in terms of the price that would be received upon the sale of an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date.

The price used to measure the fair value is not adjusted for transaction costs. Under ASC Topic 820, the fair value measurement also assumes that the transaction to sell an asset occurs in the principal market for the asset or, in the absence of a principal market, the most advantageous market for the asset. The principal market is the market in which the reporting entity would sell or transfer the asset with the greatest volume and level of activity for the asset. In determining the principal market for an asset or liability under ASC Topic 820, it is assumed that the reporting entity has access to the market as of the measurement date. If no market for the asset exists or if the reporting entity does not have access to the principal market, the reporting entity should use a hypothetical market.

Under ASC Topic 820, assets and liabilities carried at fair value on the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value:

Level 1 — The valuation is based on quoted prices in active markets for identical instruments.

Level 2 — The valuation is based on observable inputs such as quoted prices for similar instruments in active markets, quoted prices for identical or similar instruments in markets that are not active, and model-based valuation techniques for which all significant assumptions are observable in the market.

Level 3 — The valuation is based on unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the instrument. Level 3 valuations are typically performed using pricing models, discounted cash flow methodologies, or similar techniques, which incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument or valuations that require significant management judgment or estimation.

Fair values of assets or liabilities are determined based on the fair value hierarchy established in ASC Topic 820, which requires an entity to maximize the use of quoted prices and observable inputs and to minimize the use of unobservable inputs when measuring fair value. Various valuation techniques are utilized, depending on the nature of the financial instrument, including the use of market prices for identical or similar instruments, or discounted cash flow models. When possible, active and observable market data for identical or similar financial instruments are utilized. Alternatively, fair value is determined using assumptions that management believes a market participant would use in pricing the asset or liability.

Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature.

The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013 (in thousands):

31-Dec-14

Level 1

Level 2

Level 3

Fair Value

Inputs

Assets

Borrower Loans

—

273,243

Restricted Cash

76,783

4,517

—

81,300

Short Term Investments

—

1,274

—

1,274

Loans Held for Sale

—

8,463

Total Assets

76,783

5,791

281,706

364,280

Liabilities

Notes

—

273,783

31-Dec-13

Level 1

Level 2

Level 3

Fair Value

Inputs

Assets

Borrower Loans

—

233,105

Restricted Cash

49,904

170

50,074

Short Term Investments

—

1,271

—

1,271

Loans Held for Sale

—

3,206

Total Assets

49,904

1,441

236,311

287,656

Liabilities

Notes

—

234,218

As observable market prices are not available for the Borrower Loans, Loans Held for Sale and Notes, or for similar assets and liabilities, Prosper believes the Borrower Loans, Loans Held for Sale and Notes should be considered Level 3 financial instruments under ASC Topic 820. In a hypothetical transaction as of the measurement date, Prosper believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which Prosper might offer those loans may result in differences between the originated amount of the loans and their fair value as of the transaction date. For Borrower Loans and Loans Held for Sale, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, default rates and discount rates based on the perceived credit risk within each credit grade.

The obligation to pay principal and interest on any series of Notes is equal to the loan payments, if any, that are received on the corresponding Borrower Loan, net of our servicing fee which is generally 1% of the outstanding balance. The fair value election for Notes and Borrower Loans allows both the assets and the related liabilities to receive similar accounting treatment for expected losses which is consistent with the subsequent cash flows to investors that are dependent upon borrower payments. As such, the fair value of a series of Notes is approximately equal to the fair value of the corresponding Borrower Loan, adjusted for the 1.0% servicing fee and the timing of loan purchase, note issuance and borrower payments subsequently disbursed to such Note holders. As a result, the valuation of the Notes uses the same methodology and assumptions as the Borrower Loans, except that the Notes incorporate the 1% servicing fee and any differences in timing in payments. Any unrealized gains or losses on the Borrower Loans and Notes for which the fair value option has been elected is recorded as a separate line item in the statement of operations. The effective interest rate associated with a group of Notes is less than the interest rate earned on the corresponding Borrower Loan due to the 1.0% servicing fee. See Note 4 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.

Borrower Loans and Notes

Through the Note Channel, the Company purchases Borrower Loans from WebBank then issues Notes and purchases, and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on the Company’s consolidated balance sheets as assets and liabilities, respectively. The Company has adopted the provisions of ASC Topic 825, Financial Instruments (“ASC Topic 825”). ASC Topic 825 permits companies to choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the reader of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. A specific allowance account is not recorded relating to the Borrower Loans in which the Company has elected the fair value option, but rather the Company estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies adjusted for the expected prepayment, loss and recovery rates. The Borrower Loans are not derecognized when a corresponding Note is issued as the Company maintains the ability to sell the Borrower Loans without the approval of the holders of the corresponding Notes.

Loan Servicing Assets and Liabilities

The Company records servicing assets and liabilities at their estimated fair values if servicing rights are retained when the Company sells Borrower Loans to unrelated third-party buyers. The gain or loss on a loan sale is recorded in “Other Revenue” while the fair value of the servicing rights, which is based on the degree to which the contractual loan servicing fee is above or below an estimated market servicing fee is recorded in servicing assets or liabilities. Servicing assets and liabilities are recorded in “Prepaid and Other Assets” and “Accrued Expenses and Other Liabilities,” respectively, on the consolidated balance sheets. The initial fair value of servicing assets or liabilities are amortized in proportion to and over the period of estimated servicing income or loss and are reported in “Servicing Fees” on the consolidated statement of operations.

The Company uses a discounted cash flow model to estimate the fair value of the loan servicing assets or liabilities which considers the contractual projected servicing fee revenue that the Company earns on the Borrower Loans, estimated market servicing fees to service such loans, prepayment rates, default rates and the current principal balances of the Borrower Loans.

The Company periodically assesses servicing assets accounted for using the amortization method for impairment. For purposes of measuring impairment, the servicing assets are stratified based on predominant risk characteristics of the underlying serviced Borrower Loans. These risk characteristics include loan type, interest rate and term. Impairment, if any, represents the excess of amortized cost of an individual stratum over its estimated fair value and is recognized in current period earnings and the carrying value of the assets is adjusted through a valuation allowance.

Loans Held for Sale

Loans held for sale are comprised of Borrower Loans held for short durations and are recorded at fair value. The fair value is estimated using discounted cash flow methodologies based upon a set of valuation assumptions similar to those of other Borrower Loans, which are set forth in Note 2— Fair Value Measurement. The Company has adopted the provisions of ASC Topic 825. ASC Topic 825 permits companies to choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the reader of the financial statements and it allows for the Loans Held for Sale to be measured at fair value similar to Borrower Loans and Notes. The fair value election, with respect to an item, may not be revoked once an election is made.

Property and Equipment

Property and equipment consists of computer equipment, office furniture and equipment, software purchased or developed for internal use and web site development costs. Property and equipment are stated at cost, less accumulated depreciation and amortization, and are computed using the straight-line method based upon estimated useful lives of the assets. Estimated useful lives of the assets as follows:

Furniture and fixtures

7 years

Office equipment

5 years

Computers and equipment

3 years

Leasehold improvements

5-8 years

Software and website development costs

1-3 years

Internal use software costs and website development costs are accounted for, in accordance with ASC Topic 350-40, Internal Use Software, and ASC Topic 350-50, Website Development Costs. In accordance with ASC Topic 350-40 and 350-50, the costs to develop software for the website and other internal uses are capitalized when management has authorized and committed project funding, preliminary development efforts are successfully completed, and it is probable that the project will be completed and the software will be used as intended. Capitalized software and website development costs primarily include software licenses acquired, fees paid to outside consultants, and salaries and payroll related costs for employees directly involved in the development efforts.

Costs incurred prior to meeting these criteria, together with costs incurred for training and maintenance, are expensed. Costs incurred for upgrades and enhancements that are considered to be probable to result in additional functionality are capitalized. Capitalized costs are included in property and equipment and amortized to expense using the straight-line method over their expected lives. Software and website development assets are evaluated for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of software and website development assets to be held and used is measured by a comparison of the carrying amount of the asset group to the future net undiscounted cash flows expected to be generated by the asset group. If such software and website development assets are considered to be impaired, the impairment to be recognized is the excess of the carrying amount over the fair value of the software and website development asset group.

Payable to Investors

Payable to investors primarily represents our obligation to investors related to cash held in for the benefit account, payments-in-process received from investors.

Repurchase Liability for Unvested Restricted Stock Awards

Under the terms of the Company’s stock option plan certain options issued to employees can be exercised before they have vested. When this occurs the Company records a liability for the unvested portion of the exercise. If the employee’s employment is terminated before all of the shares become vested the Company may repurchase the unvested shares at the original exercise price. The liability is released into equity as the shares become vested. Early exercises of options are not deemed to be substantive exercises for accounting purpose and are excluded from the basic earnings per share calculation and treated as unexercised options shares for stock compensation purposes.

Revenue Recognition

Revenue primarily results from fees and net interest income earned. Fees include transaction fees paid by WebBank on origination of Borrower Loans and servicing fees paid by investors. We also have other smaller sources of revenue reported as other revenue, this includes referral fees and gains or losses on the sale of Borrower Loans.

Transaction Fees

The Company earns a transaction fee upon the successful origination of all Borrower Loans facilitated through Prosper’s marketplace. WebBank charges the borrower an origination fee and the Company receives payments from WebBank equal to the origination fee as compensation for the loan origination activities the Company performs on behalf of WebBank. The borrower receives an amount equal to the Borrower Loan amount net of the loan origination fee. The loan origination fee is determined by the term and credit grade of the Borrower Loan, and ranges from 1.00% to 5.00% of the original principal amount of such Borrower Loan. The Company records the transaction fee net of any fees paid to WebBank. Since the Company accounts for Borrower Loans and Loans held for sale at fair value, transaction fees are not deferred but are recognized at acquisition of the Borrower Loan, and direct costs to originate Borrower Loans are recorded as expenses as incurred.

Servicing Fees

Investors in whole loans typically pay the Company a servicing fee which is currently generally set at 1% per annum of the outstanding principal balance of the corresponding loan prior to applying the current payment. The servicing fee compensates the Company for the costs incurred in servicing the related Borrower Loan, including managing payments from borrowers, payments to investors and maintaining investors’ account portfolios. The Company records servicing fees from Borrower Loan holders as a component of operating revenue when received. The amortization of servicing rights is also included in servicing fees.

Interest Income on Borrower Loans, and Interest Expense on Notes

The Company recognizes interest income on Borrower Loans funded through the Note Channel and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent the Company believes it to be collectable.

Advertising Costs

Advertising costs are expensed when incurred and are included in sales and marketing expense in the accompanying consolidated statements of operations. The Company incurred advertising costs of $24.1 million, and $12.7 million for the years ended December 31, 2014 and 2013, respectively.

Stock-Based Compensation

We determine the fair value of our stock options issued to employees on the date of grant using the Black-Scholes option pricing model, which is impacted by the fair value of our common stock, as well as changes in assumptions that include, but are not limited to, the expected common stock price volatility over the term of the option awards, the expected term of the awards, risk-free interest rates and the expected dividend yield.

We recognize compensation expense for our stock based awards on a straight-line basis over the period during which an employee is required to provide services in exchange for the award (the vesting period of the award). Stock-based compensation expense is recognized only for those awards expected to vest. We estimate future forfeitures at the date of grant and revise the estimates, if necessary, in subsequent periods if actual forfeitures differ from those estimates.

Compensation expense for stock options issued to nonemployees is calculated using the Black-Scholes option pricing model and is recorded over the requisite service period.

Income Taxes

The asset and liability method is used to account for income taxes as codified in ASC Topic 740, Income Taxes. Under this method, deferred income tax assets and liabilities are based on the differences between the financial statement carrying values and tax bases of assets and liabilities that will result in taxable or deductible amounts in the future based on enacted tax laws and rates applicable to the periods in which the differences are expected to affect taxable income. Valuation allowances are established when necessary to reduce deferred tax assets to the amount expected to be realized.

The Company’s policy is to include interest and penalties related to gross unrecognized tax benefits within its provision for income taxes. U.S. Federal, California and other state income tax returns are filed. The Company is currently not undergoing any income tax examinations. Due to the net operating loss, generally all tax years remain open.

We recognize benefits from uncertain tax positions only if we believe that it is more likely than not that the tax position will be sustained on examination by the taxing authorities based on the technical merits of the position. The tax benefits in the financial statements from such positions are then measured based on the largest benefit that has a greater than 50% likelihood of being realized upon settlement.

Comprehensive Income

There is no comprehensive income (loss) other than the net income (loss) disclosed in the condensed consolidated statements of operations.

Recent Accounting Pronouncements

In May 2014, as part of its ongoing efforts to assist in the convergence of U.S. GAAP and International Financial Reporting Standards (“IFRS”), the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “Revenue from Contracts with Customers.” The new guidance sets forth a new five-step revenue recognition model which replaces the prior revenue recognition guidance in its entirety and is intended to eliminate numerous industry-specific pieces of revenue recognition guidance that have historically existed in U.S. GAAP. The underlying principle of the new standard is that a business or other organization will recognize revenue to depict the transfer of promised goods or services to customers in an amount that reflects what it expects in exchange for the goods or services. The standard also requires more detailed disclosures and provides additional guidance for transactions that were not addressed completely in the prior accounting guidance. The standard will be effective for the Company in the first quarter of fiscal 2017. Early adoption is not permitted. The Company is currently assessing the potential impact on its financial statements from adopting this new guidance.

In August 2014, the FASB issued ASU 2014-15, “Presentation of Financial Statements - Going Concern (Subtopic 205-40); Disclosure of Uncertainties about an Entity’s Ability to Continue as a Going Concern,” which requires management of a company to evaluate whether there is substantial doubt about the company’s ability to continue as a going concern. This ASU is effective for the annual reporting period ending after December 15, 2016, and for interim and annual reporting periods thereafter, with early adoption permitted. The Company is currently assessing the potential impact on its financial statements from adopting this new guidance.

In February 2015, the FASB issued ASU 2015-02, "Consolidation (Topic 810): Amendments to the Consolidation Analysis." ASU 2015-02 affects reporting entities that are required to evaluate whether they should consolidate certain legal entities. ASU 2015-02 is effective for periods beginning after December 15, 2015 with early adoption permitted. The Company is currently evaluating the new guidance and has not determined the impact this standard may have on its financial statements.

On January 1, 2015, we elected to adopt the fair value method to measure the servicing assets and liabilities for all classes subsequent to initial recognition. ASC-860-50-35-3e allows the subsequent adoption of the fair value method at the beginning of any fiscal year. The adoption of the fair value method for a particular class is irrevocable. Prior to January 1, 2015 we measured the servicing assets and liabilities using the amortized cost method.

Prosper Funding LLC [Member]

Significant Accounting Policies [Line Items]

Summary of Significant Accounting Policies

Significant Accounting Policies

Basis of Presentation

PFL’s consolidated financial statements include the accounts of PFL and its wholly-owned subsidiary PAH. All intercompany balances and transactions between PFL and PAH have been eliminated in consolidation. PFL’s financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).

Use of Estimates

The preparation of PFL’s consolidated financial statements in conformity with accounting principles generally accepted in the United States requires management to make certain estimates, judgments and assumptions that affect the reported amounts of assets and liabilities and the related disclosures at the date of the condensed consolidated financial statements and the reported amounts of revenues and expenses during the reporting periods. These estimates, judgments and assumptions include but are not limited to the following: valuation of Loans Held for Sale, Borrower Loans and associated Notes, valuation of servicing rights, repurchase and indemnification obligation, valuation allowance on deferred tax assets, and contingent liabilities. PFL bases its estimates on historical experience from all Borrower Loans, and on various other assumptions that it believes to be reasonable under the circumstances. Actual results could differ from those estimates, and those could be material.

Certain Risks

In the normal course of its business, PFL encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject PFL to significant concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash. PFL places cash, cash equivalents and restricted cash with high-quality financial institutions and is exposed to credit risk in the event of default by these institutions to the extent the amount recorded on the balance sheet exceeds federally insured amounts. PFL also performs periodic evaluations of the relative credit standing of these financial institutions and has not sustained any credit losses from instruments held at these financial institutions.

To the extent that Borrower Loan (including Borrower Loans that have been sold) payments are not made, servicing income will be reduced. A group of Notes corresponding to a particular Borrower Loan is wholly dependent on the repayment of such Borrower Loan. As a result, PFL does not bear the risk on such Borrower Loan.

PFL is subject to various regulatory requirements. The failure to appropriately identify and address these regulatory requirements could result in certain discretionary actions by regulators that could have a material effect on PFL’s financial position and results of operations.

Reclassifications

During the year ended December 31, 2014, PFL changed the presentation of its revenues in the consolidated statement of operations. A new line called “Servicing Fees, Net” was created and the servicing fees related to Borrower Loans that have been sold that were previously included in interest income were reclassified to this new line. Also, the “Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net” was moved into the total revenues subtotal. The Company also changed the definitions used to classify expenses. Expenses were previously classified as cost of services, administration fee, depreciation and amortization, professional services and other operating expenses. The revised classification approach replaces the previous classifications with servicing, administration fee –related party, and general and administration. The changes had no impact to the total expenses or net income. Prior period amounts have been reclassified to conform to the current presentation. Management believes these changes make the income statement more useful for the readers of the financial statements and comparable with the Company’s competitors.

Consolidation of Variable Interest Entities

Cash and Cash Equivalents

Cash equivalents are recorded at cost, which approximates fair value. Such deposits periodically exceed amounts insured by the FDIC.

Restricted Cash

Restricted cash consists primarily of cash deposits and short term certificates of deposit held as collateral as required for loan funding and servicing activities, and cash that investors or the Company has on our platform that has not yet been invested in loans or disbursed to the investor.

Short Term Investments

Fair Value Measurement

PFL has adopted Accounting Standards Codification Topic 820, Fair Value Measurements and Disclosures (“ASC topic 820”), which provides guidance measuring the fiar value of assets and liabilities. ASC Topic 820 also provides a fair value hierarchy, which prioritizes information used to measure fair value and the effect of fair value measurements on earnings and provides for enhanced disclosures determined by the level within the hierarchy of information used in the valuation. ASC Topic 820 applies whenever other standards require (or permit) assets or liabilities to be measured at fair value.

Under ASC Topic 820, assets and liabilities carried at fair value in the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value:

Level 1 — The valuation is based on quoted prices in active markets for identical instruments.

Financial instruments consist principally of cash and cash equivalents, restricted cash, Borrower Loans, accounts payable and accrued liabilities, and Notes. The estimated fair values of cash and cash equivalents, restricted cash, accounts payable and accrued liabilities approximate their carrying values because of their short term nature.

The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013:

Level 1

Level 2

Level 3

31-Dec-14

Inputs

Fair Value

Assets

Borrower Loans

—

273,243

Restricted Cash

73,103

—

73,103

Short Term Investments

—

1,274

—

1,274

Loans Held for Sale

—

8,463

Total Assets

73,103

1,274

281,706

356,083

Liabilities

Notes

—

273,783

Level 1

Level 2

Level 3

31-Dec-13

Inputs

Fair Value

Assets

Restricted Cash

46,900

—

46,900

Short Term Investments

—

1,271

—

1,271

Borrower Loans

—

233,104

Loans Held for Sale

—

3,206

Total Assets

46,900

1,271

236,310

284,481

Liabilities

Notes

—

234,218

As observable market prices are not available for the Borrower Loans, Loans Held for Sale and Notes, or for similar assets and liabilities, PFL believes the Borrower Loans, Loans Held for Sale and Notes should be considered Level 3 financial instruments under ASC Topic 820. In a hypothetical transaction as of the measurement date, PFL believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which PFL might offer those loans may result in differences between the originated amount of the loans and their fair value as of the transaction date. For Borrower Loans and Loans Held for Sale, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, default rates and discount rates based on the perceived credit risk within each credit grade.

The obligation to pay principal and interest on any Note is equal to the loan payments, if any, that are received on the corresponding Borrower Loan, net of our servicing fee which is generally 1.0%. The fair value election for Notes and Borrower Loans allows both the assets and the related liabilities to receive similar accounting treatment for expected losses which is consistent with the subsequent cash flows to lenders that are dependent upon borrower payments. As such, the fair value of a group of Notes is approximately equal to the fair value of the corresponding Borrower Loan, adjusted for the 1.0% servicing fee and the timing of borrower payments subsequently disbursed to such Note holders. As a result, the valuation of the Notes uses the same methodology and assumptions as the Borrower Loans, except that the Notes incorporates the 1% servicing fee and any differences in timing in payments. Any unrealized gains or losses on the Borrower Loans and Notes for which the fair value option has been elected is recorded as a separate line item in the statement of operations. The effective interest rate associated with a group of Notes is less than the interest rate earned on the corresponding Borrower Loan due to the 1.0% servicing fee. See Note 4 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.

Borrower Loans and Notes

Through the Note Channel, the Company purchases Borrower Loans from WebBank then issues Notes and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on the Company’s consolidated balance sheets as assets and liabilities, respectively. The Company has adopted the provisions of ASC Topic 825, Financial Instruments (“ASC Topic 825”). ASC Topic 825 permits companies to choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the reader of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. A specific allowance account is not recorded relating to the Borrower Loans in which the Company has elected the fair value option, but rather the Company estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies adjusted for the expected payment, loss and recovery rates. The Borrower Loans are not derecognized when a corresponding Note is issued as the Company maintains the ability to sell the Borrower Loans without the approval of the holders in the corresponding Notes.

Loan Servicing Assets and Liabilities

The Company records servicing assets and liabilities at their estimated fair values if servicing rights are retained when the Company sells Borrower Loans to unrelated third-party buyers. The gain or loss on a loan sale is recorded in “Other Revenue” while the fair value of the servicing rights, which is based on the degree to which the contractual loan servicing fee is above or below an estimated market loan servicing fee is recorded in servicing assets or liabilities. Servicing assets and liabilities are recorded in “Prepaid and Other Assets” and “Accrued Expenses and Other Liabilities,” respectively, on the consolidated balance sheets. The initial fair value of servicing assets or liabilities are amortized in proportion to and over the period of estimated servicing income or loss and are reported in “Servicing Fees” on the consolidated statement of operations.

The Company uses a discounted cash flow model to estimate the fair value of the loan servicing assets or liabilities which considers the contractual projected servicing fee revenue that the Company earns on the loans, estimated market servicing fees to service such loans, prepayment rates, default rates and the current principal balances of the loans.

The Company periodically assesses servicing assets accounted for using the amortization method for impairment. For purposes of measuring impairment, the servicing assets are stratified based on predominant risk characteristics of the underlying serviced loans. These risk characteristics include loan type, interest rate and term. Impairment, if any, represents the excess of amortized cost of an individual stratum over its estimated fair value and is recognized in current period earnings and the carrying value of the assets is adjusted through a valuation allowance.

Loans Held for Sale

Loans held for sale are primarily comprised of Borrower Loans held for short durations and are recorded at fair value. The fair value is estimated using discounted cash flow methodologies based upon a set of valuation assumptions similar to those of other Borrower Loans, which are set forth in Note 2— Fair Value Measurement. The Company has adopted the provisions of ASC Topic 825. ASC Topic 825 permits companies to choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the reader of the financial statements and it allows for the Loans Held for Sale to be measured at fair value similar to Borrower Loans and Notes. The fair value election, with respect to an item, may not be revoked once an election is made.

Internal Use Software and Website Development

PFL accounts for internal use software costs, including website development costs, in accordance with ASC Topic 350-40, Internal Use Software and ASC Topic 350-50, Website Development Costs. In accordance with ASC Topic 350-40 and 350-50, the costs to develop software for the website and other internal uses are capitalized when management has authorized and committed project funding, preliminary development efforts are successfully completed, and it is probable that the project will be completed and the software will be used as intended. Capitalized software and website development costs primarily include software licenses acquired, fees paid to outside consultants, and salaries and payroll related costs for employees directly involved in the development efforts.

Costs incurred prior to meeting these criteria, together with costs incurred for training and maintenance, are expensed. Costs incurred for upgrades and enhancements that are considered to be probable to result in additional functionality are capitalized. Capitalized costs are included in property and equipment and amortized to expense using the straight-line method over their expected lives which is generally one to three years. PFL evaluates its software assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of software and website development assets to be held and used is measured by a comparison of the carrying amount of the asset to the future net undiscounted cash flows expected to be generated by the asset. If such software and website development assets are considered to be impaired, the impairment to be recognized is the excess of the carrying amount over the fair value of the software and website development asset group.

Payable to Investors

Payable to investors primarily represents our obligation to investors related to cash held in the “for the benefit” or FBO account and payments-in-process received from investors.

Revenue Recognition

Revenue primarily results from fees and net interest earned. Fees consist of related part administrative fees and servicing fees paid by investors. We also have other smaller sources of revenue reported as other revenue this includes the gains or losses on whole loan sales.

Administration Agreement License Fees

PFL primarily generates revenues through license fees it earns through an Administration Agreement with PMI. The Administration Agreement contains a license granted by PFL to PMI that entitles PMI to use the platform for and in relation to: (i) PMI’s performance of its duties and obligations under the Administration Agreement relating to corporate administration, loan platform services, loan and note servicing and marketing, and (ii) PMI’s performance of its duties and obligations to WebBank in relation to loan origination and funding. The license fees are based on the number of listings that are posted to the platform.

Service Fees

Investors in whole loans typically pay the Company a servicing fee which is currently generally set at 1% per annum of the outstanding principal balance of the corresponding loan prior to applying the current payment. The servicing fee compensates the Company for the costs we incur in servicing the related loan, including managing payments from borrowers, payments to investors and maintaining investors’ account portfolios. Prosper records servicing fees paid by borrower loan holders as a component of operating revenue when received. The amortization of servicing rights is also included in servicing fees.

Interest Income on Borrower Loans and Interest Expense on Notes

PFL recognizes interest income on Borrower Loans funded through the Note Channel and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent PFL believes it to be collectable.

Comprehensive Income

There is no comprehensive income (loss) other than the net income (loss) disclosed in the condensed consolidated statements of operations.

Recent Accounting Pronouncements

Property_and_Equipment_Net

Property and Equipment, Net	12 Months Ended
Property and Equipment, Net	Dec. 31, 2014
Property and Equipment, Net	3	Property and Equipment, Net
	Property and equipment consist of the following (in thousand)s:

			December 31,
			2014			2013
	Property and equipment:
	Computer equipment		$	3,824		$	2,115
	Internal-use software and website development costs			4,486			3,592
	Office equipment and furniture			1,904			39
	Leasehold improvements			5,274			—
	Assets not yet placed in service			4,361			651
	Property and equipment			19,849			6,397
	Less accumulated depreciation and amortization			(5,425	)		(3,371	)
	Total property and equipment, net		$	14,424		$	3,026

	Depreciation expense for 2014 and 2013 was $2,097 thousand and $1,094 thousand, respectively. The Company capitalized internal-use software and website development costs in the amount of $846 thousand and $1,561 thousand for the years ended December 31, 2014 and 2013, respectively. The Company recorded internal-use software and website development impairment charges $322 thousand and $299 thousand for the years ended December 31, 2014 and 2013 respectively, as a result of our decision to discontinue several software and website development projects.

Prosper Funding LLC [Member]
Property and Equipment, Net	3. Property and Equipment
	Property and equipment consist of the following (in thousands) :

			December 31,
			2014			2013
	Property and equipment:
	Internal-use software and web site development costs		$	4,042		$	3,217
	Property and equipment			4,042			3,217
	Less accumulated depreciation and amortization			(2,917	)		(1,607	)
	Total property and equipment, net		$	1,125		$	1,610
	Depreciation expense for 2014 and 2013 was $1,314 thousands and $nil, respectively. PFL capitalized internal-use software costs in the amount of $1,798 thousands and $671 thousands for the years ended December 31, 2014 and 2013, respectively. The Company recorded internal software impairment charges $17 thousands and $nil for the years ended December 31, 2014 and 2013 respectively, as a result of our decision to discontinue several software development projects.

Borrower_Loans_Loans_Held_for_

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value	12 Months Ended
	Dec. 31, 2014
Borrower Loans, Loans Held for Sale and Notes Held at Fair Value	4	Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value
	The fair value of the Borrower Loans and Notes funded through the Note Channel is estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary cash flow assumptions used to value such Borrower Loans and Notes include default rates derived from historical performance and discount rates applied to each credit grade based on the perceived credit risk of each credit grade. The obligation to pay principal and interest on any series of Notes is equal to the loan payments, if any, received on the corresponding Borrower Loan, net of the servicing fee. As such, the fair value of the Notes is approximately equal to the fair value of the Borrower Loans funded through the Note Channel, adjusted for the servicing fee and the timing of borrower payments subsequently disbursed to the Note holders. The effective interest rate associated with a series of Notes will be less than the interest rate earned on the corresponding Borrower Loan due to the servicing fee.
	At December 31, 2014 and December 31, 2013, Borrower Loans, Notes and Loans Held for Sale (in thousands) were:

			Borrower Loans								Notes						Loans Held for Sale
			December 31, 2014				December 31, 2013				December 31, 2014			December 31, 2013			December 31, 2014		December 31, 2013
	Aggregate principal balance		$	268,598			$	228,184			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	outstanding		$	268,598			$	228,184			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	Fair value adjustments			4,645				4,921				(1,514	)		(2,125	)		168		49
	Fair value		$	273,243			$	233,105			$	(273,783	)	$	(234,218	)	$	8,463	$	3,206

	At December 31, 2013, Loans Held for Sale, Borrower Loans and underlying Notes had original terms between 12 months and 60 months, had monthly payments with fixed interest rates ranging from 5.65% to 35% and had various maturity dates through December 2018. At December 31, 2014, outstanding Borrower Loans and the underlying Notes had original maturities between 36 and 60 months, had monthly payments with fixed interest rates ranging from 5.77% to 33.04% and had various maturity dates through December 2019.
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2014 for Loans Held for Sale, Borrower Loans and Notes funded through the Note Channel are presented in the following table (in thousands):

			Borrower Loans / Loans Held for Sale				Notes
	Discount rate assumption:			5.25	%	*		5.25	%	*
	Resulting fair value increase/(decrease) from:
	100 basis point increase		$	278,212			$	270,672
	200 basis point increase			275,108				267,646
	Resulting fair value from:
	100 basis point decrease		$	284,683			$	276,983
	200 basis point decrease			288,059				280,274
	Default rate assumption:			12.06	%	*		12.06	%	*
	Resulting fair value from:
	Applying a 0.8 multiplier to default rate		$	288,507			$	280,696
	Applying a 0.9 multiplier to default rate			284,968				277,253
	Resulting fair value from:
	Applying a 1.1 multiplier to default rate		$	277,881			$	270,357
	Applying a 1.2 multiplier to default rate			274,443				267,012
	* Represents weighted average assumptions considering all credit grades.
	The changes in Level 3 assets measured at fair value on a recurring basis are as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Borrower				Notes				Loans Held			Total
			Loans				Notes				for Sale			Total
	Balance at January 1, 2013		$	163,861			$	(164,840	)		$	—		$	(979	)
	Purchase of Loans/Issuance of Notes			169,859				(170,586	)			184,807			184,080
	Principal repayments			(90,054	)			89,681				—			(373	)
	Borrower loans sold to third parties			—				—				(181,656	)		(181,656	)
	Change in fair value			(10,561	)			11,527				55			1,021
	Balance at December 31, 2013		$	233,105			$	(234,218	)		$	3,206		$	2,093

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Borrower				Notes				Loans Held			Total
			Loans				Notes				for Sale			Total
	Balance at January 1, 2014		$	233,105			$	(234,218	)		$	3,206		$	2,093
	Purchase of Loans/Issuance of Notes			177,088				(176,865	)			1,416,809			1,417,032
	Principal repayments			(121,082	)			120,909				—			(173	)
	Borrower loans sold to third parties			—				—				(1,411,625	)		(1,411,625	)
	Change in fair value			(15,868	)			16,391				73			596
	Balance at December 31, 2014		$	273,243			$	(273,783	)		$	8,463		$	7,923

	Changes in fair value of Borrower Loans include an increase in accrued interest receivable of $0.1 million and $0.4 million for the years ending December 31, 2014 and 2013 respectively. Changes in fair values of Notes the increase in interest payable represents $0.2 million and $0.05 million for the years ending December 31, 2014 and 2013 respectively. The changes in fair value would directly impact the change in fair value on Borrower Loans, Loans held for sale and Notes in the condensed consolidated statements of operations. Approximately $16.3 million and $15.9 million represents the aggregate adverse fair value adjustments that was recorded to charge off Borrower Loans during the years ending December 31, 2014 and 2013 respectively.
	As December 31, 2014 the Borrower Loans that were 90 days or more delinquent, had an aggregate principal amount of $1.7 million and a fair value of $0.6 million. As December 31, 2013 the Borrower Loans that were 90 days or more delinquent, had an aggregate principal amount of $1.9 million and a fair value of $0.7 million. We place loans on non-accrual status when they are over 120 days due. As of December 31, 2014 and 2013, Borrower Loans in non-accrual status had a fair value of $nil.

Prosper Funding LLC [Member]
Borrower Loans, Loans Held for Sale and Notes Held at Fair Value	4	Borrower Loans, Loans Held For Sale and Notes Held at Fair Value
	The fair value of the Borrower Loans and Notes funded through the Note Channel is estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary cash flow assumptions used to value such Borrower Loans and Notes include default rates derived from historical performance and discount rates applied to each credit grade based on the perceived credit risk of each credit grade. The obligation to pay principal and interest on any series of Notes is equal to the loan payments, if any, received on the corresponding Borrower Loan, net of the servicing fee. As such, the fair value of the Notes is approximately equal to the fair value of the Borrower Loans funded through the Note Channel, adjusted for the servicing fee and the timing of borrower payments subsequently disbursed to the Note holders. The effective interest rate associated with a series of Notes will be less than the interest rate earned on the corresponding Borrower Loan due to the servicing fee.
	At December 31, 2014 and December 31, 2013, borrower loans, notes and loans held for sale (in thousands) were:

			Borrower Loans								Notes						Loans Held for Sale
			31-Dec-14				31-Dec-13				31-Dec-14			31-Dec-13			31-Dec-14		31-Dec-13
	Aggregate principal balance		$	268,598			$	228,183			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	outstanding		$	268,598			$	228,183			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	Fair value adjustments			4,645				4,921				(1,514	)		(2,125	)		168		49
	Fair value		$	273,243			$	233,104			$	(273,783	)	$	(234,218	)	$	8,463	$	3,206
	At December 31, 2013, loans underlying notes and certificates had original terms between 12 months and 60 months, had monthly payments with fixed interest rates ranging from 5.65% to 35% and had various maturity dates through December 2018. At December 31, 2014, outstanding loans underlying notes and certificates had original maturities between 36 and 60 months, had monthly payments with fixed interest rates ranging from 5.77% to 33.04% and had various maturity dates through December 2019.
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2014 for Borrower Loans and Notes funded through the Note Channel are presented in the following table (in thousands):

			Borrower				Notes
			Loans				Notes
	Discount rate assumption:			5.25	%	*		5.25	%	*
	Resulting fair value from:
	100 basis point increase		$	278,212			$	270,672
	200 basis point increase			275,108				267,646
	Resulting fair value from:
	100 basis point decrease		$	284,683			$	276,983
	200 basis point decrease			288,059				280,274
	Default rate assumption:			12.06	%	*		12.06	%	*
	Resulting fair value from:
	Applying a 0.8 multiplier to default rate		$	288,507			$	280,696
	Applying a 0.9 multiplier to default rate			284,968				277,253
	Resulting fair value from:
	Applying a 1.1 multiplier to default rate		$	277,881			$	270,357
	Applying a 1.2 multiplier to default rate			274,443				267,012
	* Represents weighted average assumptions considering all credit grades.
	The changes in Level 3 assets measured at fair value on a recurring basis are as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
											Loans
											Held for
			Borrower Loans				Notes				Sale			Total
	Balance at January 1, 2013		$	—			$	—			$	—		$	—
	Assets transferred on February 1, 2013			167,376				(167,758	)			—			(382	)
	Originations			160,037				(160,764	)			184,807			184,080
	Principal repayments			(83,677	)			82,924				—			(753	)
	Borrower loans sold to third parties			—				—				(181,645	)		(181,645	)
	Change in fair value			(10,632	)			11,380				44			792
	Balance at December 31, 2013		$	233,104			$	(234,218	)		$	3,206		$	2,092

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
											Loans
											Held for
			Borrower Loans				Notes				Sale			Total
	Balance at January 1, 2014		$	233,104			$	(234,218	)		$	3,206		$	2,092
	Originations			177,088				(176,865	)			1,416,809			1,417,032
	Principal repayments			(121,081	)			120,909				—			(172	)
	Borrower loans sold to third parties			—				—				(1,411,625	)		(1,411,625	)
	Change in fair value			(15,868	)			16,391				73			596
	Balance at December 31, 2014		$	273,243			$	(273,783	)		$	8,463		$	7,923

	Of the change in fair values for Borrower Loans the increase in interest receivable represents $0.1 million and $0.3 million for the years ending December 31, 2014 and 2013 respectively. Of the change in fair values for Notes the increase in interest payable represents $0.2 million and $0.05 million for the years ending December 31, 2014 and 2013 respectively. The changes in fair value would directly impact the change in fair value on Borrower Loans, Loans held for sale, and Notes in the consolidated statements of operations. $16.3 million and $15.8 million in aggregate adverse fair value adjustments were recorded to charge off loans during the years ending December 31, 2014 and 2013 respectively.
	As December 31, 2014 the Borrower Loans that were 90 days or more delinquent, had an aggregate principal amount of $1.5 million and a fair value of $0.14 million. As December 31, 2013 the Borrower Loans that were 90 days or more delinquent, had an aggregate principal amount of $1.9 million and a fair value of $0.7 million. As of December 31, 2014 and 2013, Borrower Loans in non-accrual status had a fair value of $nil.

Loan_Servicing_Assets_and_Liab

Loan Servicing Assets and Liabilities	12 Months Ended
Loan Servicing Assets and Liabilities	Dec. 31, 2014
Loan Servicing Assets and Liabilities	5	Loan Servicing Assets and Liabilities
	The Company initially records servicing assets and liabilities at their estimated fair values when the Company sells Borrower loans in their entirety to unrelated third-party buyers. The initial fair value of such servicing assets or liabilities is amortized in proportion to and over the period of estimated servicing income or loss. The total gains recognized on the sale of such Borrower Loans were $4.0M and $0.3 million for the years ended December 31, 2014 and 2013 respectively. For the years ended December 31, 2014 and 2013 respectively no impairment was recorded.

	At December 31, 2014, Borrower Loans that were facilitated and subsequently sold to unrelated third parties, but for which we retained servicing rights had a total outstanding principle balance of $1,358 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and maturity dates through December 2019. At December 31, 2013, Borrower Loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $170.2 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and maturity dates through December 2018.
	Fair value
	Discounted cash flow – Discounted cash flow valuation techniques generally consist of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounting those cash flows at a rate of return that results in the fair value amount.
	Significant unobservable inputs presented in the table below are those that the Company considers significant to the estimated fair values of the Level 3 servicing assets and liabilities. The following is a description of the significant unobservable inputs provided in the table. Prepayment of the loans does not materially change the fair value of servicing assets and liability.
	Market servicing rate – The Company estimates adequate servicing compensation rates of what a market participant would earn to service the Borrower Loans that the Company sells to third parties. This rate is calculated on the outstanding principle balance on a per annum basis. The Company estimated these market servicing rates based on observable market rates for other loan types in the industry and bids from subservicing providers, adjusted for the unique loan attributes that are present in the specific loans that the Company sells and services and information from a backup service provider.
	Discount rate – The discount rate is a rate of return used to discount future expected cash flows to arrive at a present value, which represents the fair value of the loan servicing rights. We used a range of discount rates for the servicing assets and liabilities based on comparable observed valuations of similar assets and publicly available disclosures related to servicing valuations, with comparability adjustments made to account for differences with the Company’s servicing assets.
	Default Rate – The default rate presented is an annualized, average estimate considering all Borrower Loan categories, and represents an aggregate of conditional default rate curves for each credit grade or Borrower Loan category. Each point on a particular Borrower Loan category’s curve represents the percentage of principal expected to default per period based on the term and age of the underlying Borrower Loans. The assumption regarding defaults directly reduces servicing revenues because the amount of servicing revenues received is based on the amount of outstanding principal each period. In addition, defaults also reduce the expected terms of the Borrower Loans, which are used to project future servicing revenues.
	Significant Unobservable Inputs
	The following table presents quantitative information about the significant unobservable inputs used for our servicing asset/liability fair value measurements at December 31, 2014 and December 31, 2013:

			Range
	Unobservable Input		December 31, 2014		December 31, 2013
	Discount rate		15% - 25%		15% - 25%
	Default rate		2.62% - 26.32%		1.73% - 19.75%
	Market servicing rate		0.625% -0.70%		0.70%

	Loan Servicing Asset and Liabilities Activity:
	The following tables present additional information about Level 3 servicing assets and liabilities being amortized for the year ended December 31, 2014 and 2013 (in thousands).

			Servicing			Servicing
			Assets			Liabilities
	Amortized cost at January 1, 2013		$	—		$	—
	Additions			496			177
	Less: Amortization			(36	)		(10	)
	Amortized cost at December 31, 2013		$	460		$	167
	Additions			4,700			662
	Less: Amortization			(997	)		(205	)
	Amortized cost at December 31, 2014		$	4,163		$	624
	Fair Value at December 31, 2014		$	4,708		$	595

	Servicing Asset and Liability Fair Value Input Sensitivity:

	The table below shows the estimated impact on our estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of December 31, 2014 (in thousands, except percentages).

			Servicing			Servicing
			Assets			Liabilities
	Weighted average market servicing rate assumptions			0.625	%		0.625	%
	Increase (decrease) in fair value
	Market servicing rate increase to 0.65%		$	(348	)	$	59
	Market servicing rate decrease to 0.60%		$	348		$	(59	)
	Weighted average default assumptions			13	%		13	%
	Increase (decrease) in fair value
	Applying a 1.1 multiplier to default rate		$	(88	)	$	1
	Applying a 0.9 multiplier to default rate		$	89		$	(1	)

Prosper Funding LLC [Member]
Loan Servicing Assets and Liabilities	5	Loan Servicing Assets and Liabilities
	The Company initially records servicing assets and liabilities at their estimated fair values when the Company sells whole loans to unrelated third-party whole loan buyers. The initial fair value of such servicing assets or liabilities is amortized in proportion to and over the period of estimated servicing income or loss. The total gains recognized on the sale of the whole loans were $4.0 million and $0.3 million for the years ended December 31, 2014 and 2013 respectively. For the years ended December 31, 2014 and 2013 respectively no impairment was recorded.
	At December 31, 2014, loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $1,045 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and Maturity dates through December 2019. At December 31, 2013, loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $159.8 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and Maturity dates through December 2018.
	Fair value
	Discounted cash flow – Discounted cash flow valuation techniques generally consist of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounting those cash flows at a rate of return that results in the fair value amount.
	Significant unobservable inputs presented in the table below are those that the Company considers significant to the estimated fair values of the Level 3 servicing assets and liabilities. The following is a description of the significant unobservable inputs provided in the table. Prepayment of the loans does not materially change the fair value of servicing assets and liability.
	Market servicing rate – The Company estimates adequate servicing compensation rates of what a market participant would earn to service the loans that the Company sells to third parties. This rate is calculated on the outstanding principle balance on a per annum basis. The Company estimated these market servicing rates based on observable market rates for other loan types in the industry and bids from subservicing providers, adjusted for the unique loan attributes that are present in the specific loans that the Company sells and services and information from a backup service provider.
	Discount rate – The discount rate is a rate of return used to discount future expected cash flows to arrive at a present value, which represents the fair value of the loan servicing rights. We used a range of discount rates for the servicing assets and liabilities based on comparable observed valuations of similar assets and publicly available disclosures related to servicing valuations, with comparability adjustments made to account for differences with the Company’s servicing assets.
	Default Rate – The default rate presented is an annualized, average estimate considering all loan categories, and represents an aggregate of conditional default rate curves for each credit grade or loan category. Each point on a particular loan category’s curve represents the percentage of principal expected to default per period based on the term and age of the underlying loans. The assumption regarding defaults directly reduces servicing revenues because the amount of servicing revenues received is based on the amount of outstanding principal each period. In addition, defaults also reduce the expected terms of the loans, which are used to project future servicing revenues.
	Significant Unobservable Inputs
	The following table presents quantitative information about the significant unobservable inputs used for our servicing asset/liability fair value measurements at December 31, 2014 and December 31, 2013:

			Range
	Unobservable Input		31-Dec-14		31-Dec-13
	Discount rate		15% - 25%		15% - 25%
	Default rate		2.62% - 26.32%		1.73% - 19.75%
	Market servicing rate		0.625% -0.70%		0.70%

	Loan Servicing Assets and Liabilities Activity:
	The following tables present additional information about Level 3 servicing assets and liabilities being amortized for the years ended December 31, 2014 and 2013 (in thousands).

			Servicing			Servicing
			Assets			Liabilities
	Amortized cost at January 1, 2013		$	—		$	—
	Additions			496			177
	Less: Transfers to PMI			(24	)
	Less: Amortization			(36	)		(10	)
	Amortized cost at December 31, 2013		$	436		$	167
	Additions			4,700			662
	Less: Transfers to PMI			(1,221	)
	Less: Amortization			(799	)		(205	)
	Amortized cost at December 31, 2014		$	3,116		$	624
	Fair Value at December 31, 2014		$	3,515		$	595

	Servicing Asset and Liability Fair Value Input Sensitivity:

	The table below shows the estimated impact on our estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of December 31, 2014 (in thousands, except percentages).

			Servicing			Servicing
			Assets			Liabilities
	Weighted average market servicing rate assumptions			0.625	%		0.625	%
	Increase (decrease) in fair value
	Servicing rate increase to 0.65%		$	(260	)	$	59
	Servicing rate decrease to 0.60%		$	260		$	(59	)
	Weighted average default assumptions			10	%		10	%
	Increase (decrease) in fair value
	Applying a 1.1 multiplier to default rate		$	(66	)	$	1
	Applying a 0.9 multiplier to default rate		$	66		$	(1	)

Net_Loss_Per_Share

Net Loss Per Share	12 Months Ended
Net Loss Per Share	Dec. 31, 2014
Earnings Per Share [Abstract]
Net Loss Per Share	6	Net Loss Per Share
	Prosper computes net loss per share in accordance with ASC Topic 260, Earnings Per Share (“ASC Topic 260”). Under ASC Topic 260, basic net loss per share is computed by dividing net loss per share available to common stockholders by the weighted average number of common shares outstanding for the period and excludes the effects of any potentially dilutive securities. Diluted earnings per share, if presented, would include the dilution that would occur upon the exercise or conversion of all potentially dilutive securities into common stock using the “treasury stock” and/or “if converted” methods as applicable. The weighted average number of shares and the loss per share reflect a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
	We compute Earnings per Share (“EPS”) using the two-class method. The two-class method allocates earnings that otherwise would have been available to common shareholders to holders of participating securities. We consider all series of our convertible preferred stock to be participating securities due to their rights to participate in dividends with common stock. As such, earnings allocated to these participating securities, which include participation rights in undistributed earnings, are subtracted from net income to determine total undistributed earnings to be allocated to common stockholders. All participating securities are excluded from basic weighted-average common shares outstanding. Prior to any conversion to common shares, each series of the Company’s convertible preferred stock was entitled to participate on an if converted basis in distributions, when and if declared by the board of directors, that were made to common stockholders and as a result these shares were considered participating securities. During the year ended December 31, 2014 and 2013, certain shares issued as a result of the early exercise of stock options, which are subject to a repurchase right by the Company, were entitled to receive non-forfeitable dividends during the vesting period and as a result were considered participating securities.
	The adjustment from net income (loss) to net loss available to common shareholders represents the excess over the carrying value of such shares paid to certain preferred shareholders upon repurchase of their preferred shares as described below in Note 9 Convertible Preferred Stock and Stockholders’ Equity (Deficit). The weighted average shares used in calculating basic and diluted net loss per share excludes certain shares that are disclosed as outstanding shares in the Consolidated Balance Sheet and Consolidated Statement of Stockholders’ Equity because such shares are restricted as they were associated with options that were early exercised and continue to remain unvested.
	Basic and diluted net loss per share was calculated as follows (net loss in thousands):

			Year Ended December 31,
			2014			2013
	Numerator:
	Net loss available to common stockholders for basic and		$	(17,561	)	$	(27,007	)
	diluted EPS		$	(17,561	)	$	(27,007	)
	Denominator:
	Weighted average shares used in computing basic and			8,896,801			6,596,827
	diluted net loss per share			8,896,801			6,596,827
	Basic and diluted net loss per share		$	(1.97	)	$	(4.09	)
	Due to losses attributable to Prosper’s common shareholders for each of the periods below, the following potentially dilutive shares are excluded from the diluted net loss per share calculation because they were anti-dilutive under the treasury stock method, in accordance with ASC Topic 260:

			Year Ended December 31,
			2014			2013
			(shares)			(shares)
	Excluded securities:
	Convertible preferred stock issued and outstanding			30,699,957			27,274,068
	Stock options issued and outstanding			4,994,998			894,976
	Unvested stock options exercised			4,114,269			5,594,134
	Warrants issued and outstanding			176,887			218,810
	Total common stock equivalents excluded from diluted			39,986,111			33,981,988
	net loss per common share computation			39,986,111			33,981,988

Convertible_Preferred_Stock_an

Convertible Preferred Stock and Stockholders' Equity (Deficit)

12 Months Ended

Dec. 31, 2014

Stockholders Equity Note [Abstract]

Convertible Preferred Stock and Stockholders' Equity (Deficit)

7.Convertible Preferred Stock and Stockholders’ Equity (Deficit)

Convertible Preferred Stock

Under Prosper’s amended and restated certificate of incorporation, preferred stock is issuable in series, and the board of directors is authorized to determine the rights, preferences, and terms of each series.

In January 2013, the Company issued and sold 13,868,152 shares of new Series A (“New Series A”) preferred stock in a private placement at a purchase price of $1.44 per share for $19.8 million, net of issuance costs. In connection with that sale, the Company issued 5,117,182 shares at par value $0.01 per share of Series A-1 (“Series A-1”) convertible preferred stock to the holders of shares of the Company’s convertible preferred stock that was outstanding immediately prior to the sale (“Old Preferred Shares”) in consideration for such stockholders participating in the sale. In connection with the new Series A sale, Old Preferred Shares were converted into shares of common stock at a ratio of 1:1 if the holder of the Old Preferred Shares participated in the new Series A sale or at a 10:1 ratio if the holder of the Old Preferred Shares did not so participate. In addition, each such participating holder received a share of new Series A-1 convertible preferred stock for every dollar of liquidation preference associated with an Old Preferred Share held by such holder. Each share of Series A-1 preferred stock has a liquidation preference of $10.00 and converts into common stock at a ratio of 1,000,000:1. The Series A and Series A-1 convertible preferred stock were sold in reliance on the exemption from the registration requirements of the Securities Act set forth in Section 4(2) of the Securities Act and Regulation D promulgated thereunder regarding sales by an issuer not involving a public offering.

In September 2013, Prosper issued and sold 8,288,734 shares of new Series B (“New Series B”) convertible preferred stock in a private placement at a purchase price of $3.02 per share for approximately $24.9 million, net of issuance costs. The New Series B convertible preferred stock was sold in reliance on the exemption from the registration requirements of the Securities Act set forth in Section 4(2) of the Securities Act and Regulation D promulgated thereunder regarding sales by an issuer not involving a public offering.

In May 2014, the Company issued and sold 4,880,954 shares of new Series C (“New Series C”) convertible preferred stock in a private placement at a purchase price of $14.36 per share for approximately $69.9 million, net of issuance costs. . The Series C convertible preferred stock was sold in reliance on the exemption from the registration requirements of the Securities Act set forth in Section 4(2) of the Securities Act and Regulation D promulgated thereunder regarding sales by an issuer not involving a public offering. The purpose of the new Series C private placement was to raise funds for general corporate needs and for the tender offer discussed below.

On June 18, 2014, the Company issued a Tender Offer Statement to purchase up to 1,392,757 shares, in the aggregate, of its new Series A convertible preferred Stock and new Series B convertible preferred Stock, at a price equal to $14.36 per share. Upon closure of the tender offer on July 16, 2014, 156,508 shares of new Series A convertible preferred Stock and 1,133,558 share of new Series B convertible preferred Stock were purchased for an aggregate price of $18.5 million

The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of December 31, 2014 are disclosed in the table below:

Convertible Preferred Stock

Par Value

Authorized

Outstanding and Issued

Liquidation

shares as of

Preference

December 31,

($,000s)

2014

New Series A

0.01

13,868,152

13,711,644

19,774

Series A-1

0.01

5,117,182

4,952,183

49,522

New Series B

0.01

8,288,734

7,155,176

21,581

New Series C

0.01

4,880,954

70,075

32,155,022

30,699,957

160,952

The number of shares issued and outstanding reflect a 10-for-1 reverse stock split effected by the Company on October 29, 2013.

Dividends

Dividends on shares of the new Series A, new Series B and new Series C convertible preferred stock are payable only when, as, and if declared by the Board of Directors. No dividends will be paid with respect to the common stock until any declared dividends on the new Series A, new Series B and new Series C convertible preferred stock have been paid or set aside for payment to the new Series A, new Series B and new Series C convertible preferred stockholders. After payment of any such dividends, any additional dividends or distributions will be distributed among all holders of common stock and preferred stock in proportion to the number of shares of common stock that would be held by each such holder if all shares of preferred stock were converted to common stock at the then effective conversion rate. The Series A-1 convertible preferred shares have no dividend rights. To date, no dividends have been declared on any of the Company’s preferred stock or common stock, and there are no dividends in arrears at December 31, 2014.

Conversion

Under the terms of the Company’s amended and restated certificate of incorporation, the holders of preferred stock have the right to convert such preferred stock into common stock at any time. In addition, all preferred stock automatically converts into common stock (i) immediately prior to the closing of an Initial Public Offering (“IPO”) that values the Company at least at $750 million and that results in aggregate proceeds to the Company of at least $100 million or (ii) upon a written request from the holders of at least 60% of the voting power of the outstanding preferred stock (on an as-converted basis) including at least 14% of the voting power of the outstanding Series A-1 convertible preferred stock. In addition, if a holder of the new Series A convertible preferred stock has converted any of the new Series A convertible preferred stock, then all of such holder’s shares of Series A-1 convertible preferred stock also will be converted upon a liquidation event. In lieu of any fractional shares of common stock to which a holder would otherwise be entitled, the Company shall pay such holder cash in an amount equal to the fair market value of such fractional shares, as determined by the Board of Directors. At present, the new Series A, new Series B and the new Series C convertible preferred stock converts into the Company common stock at a 1:1 ratio while the Series A-1 convertible preferred stock converts into common stock at a 1,000,000:1 ratio.

Liquidation Rights

The Company’s convertible preferred stock has been classified as temporary equity on the accompanying balance sheets. The preferred stock is not redeemable; however, upon in the event of a voluntary or involuntary liquidation, dissolution, change in control or winding up of the Company, holders of the convertible preferred stock may have the right to receive its liquidation preference under the terms of the Company’s certificate of incorporation.

Each holder of new Series A, new Series B and new Series C convertible preferred stock is entitled to receive, on a pari passu basis, prior and in preference to any distribution of proceeds from a liquidation event to the holders of Series A-1 preferred stock or common stock, an amount per share for each share of new Series A, new Series B and new Series C convertible preferred stock equal to the sum of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share. After the payment or setting aside for payment to the holders of new Series A, new Series B and new Series C convertible preferred stock, the holders of Series A-1 convertible preferred stock are entitled to receive, prior and in preference to any distribution of proceeds to the holders of common stock an amount per share for each such share of Series A-1 convertible preferred stock equal to the sum of the liquidation preference specified for such share and all declared but unpaid dividends, if any, on such share. After the payment or setting aside for payment to the holders of new Series A, new Series B, new Series C convertible preferred stock and Series A-1 preferred stock, the entire remaining proceeds legally available for distribution will be distributed pro rata to the holders of new Series A preferred stock and common stock in proportion to the number of shares of common stock held by them assuming the new Series A preferred stock has been converted into shares of common stock at the then effective conversion rate, provided that the maximum aggregate amount per share of new Series A convertible preferred stock which the holders of new Series A convertible preferred stock shall be entitled to receive is three times the original issue price for the new Series A convertible preferred stock. At present, the liquidation preferences are equal to $1.44 per share for the new Series A convertible preferred stock, $10.00 per share for the Series A-1 convertible preferred stock, $3.02 per share for the new Series B convertible preferred stock and $14.36 per share for the new Series C convertible preferred stock.

Voting

Each holder of shares of convertible preferred stock is entitled to the number of votes equal to the number of shares of common stock into which such shares of convertible preferred stock could be converted and has voting rights and powers equal to the voting rights and powers of the common stock. The holders of convertible preferred stock and the holders of common stock vote together as a single class (except with respect to certain matters that require separate votes or as required by law), and are entitled to notice of any stockholders’ meeting in accordance with the bylaws of the Company.

Common Stock

The Company, through its amended and restated certificate of incorporation, is the sole issuer of common stock and related options and warrants. On October 29, 2013, the Company amended and restated its certificate of incorporation to effect a 10-for-1 reverse stock split. On May 15, 2014, the Company amended and restated its certificate of incorporation to effect an increase in the number of authorized shares of stock. The total number of shares of stock which the Company has the authority to issue is 80,083,905, consisting of 47,928,883 shares of common stock, $0.01 par value per share, and 32,155,022 shares of preferred stock, $0.01 par value per share, 13,868,152 of which are designated as new Series A preferred stock, 5,117,182 of which are designated as Series A-1 preferred stock and 8,288,734 of which are designated new Series B preferred stock and 4,880,954 of which are designated as Series C preferred stock. As of December 31, 2014, 14,448,700 shares of common stock were issued and outstanding. As of December 31, 2013, 13,588,803 shares of common stock were issued and outstanding. Each holder of common stock is entitled to one vote for each share of common stock held.

Common Stock Issued upon Exercise of Stock Options

During the year ended December 31, 2014 and 2013, the Company issued 924,867 and 7,327,959 shares of common stock, respectively, upon the exercise of options for cash proceeds of $0.89 million and $0.86 million, respectively, of which 865,717 and 6,499,463 were unvested, respectively. Certain options are eligible for exercise prior to vesting. These unvested options may be exercised for restricted shares of common stock that have the same vesting schedule as the options. The Company records a liability for the exercise price paid upon the exercise of unvested options, which is reclassified to common stock and additional paid-in capital as the shares vest. Should the holder’s employment be terminated, the unvested restricted shares are subject to repurchase by the Company at an amount equal to the exercise price paid for such shares. At December 31, 2014 and 2013, there were 4,114,269 and 5,594,134 shares respectively of restricted stock outstanding that remain unvested and subject to the Company’s right of repurchase.

For the year ended December 31, 2014 and 2013, the Company repurchased 181,893 shares of restricted stock for $0.09 million and 414,130 shares of restricted stock for $0.02 million, respectively upon termination of employment of various employees.

Common Stock Issued upon Exercise of Warrants

For the year ended December 31, 2014 and 2013 the Company issued 116,923 and 820 shares of common stock upon the exercise of warrants, respectively for $1.95 per share and $0.10 per share respectively.

Stock_Option_Plan_and_Compensa

Stock Option Plan and Compensation	12 Months Ended
Stock Option Plan and Compensation	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock Option Plan and Compensation	8	Stock Option Plan and Compensation
	In 2005, the Company’s stockholders approved the adoption of the 2005 Stock Plan. On December 1, 2010, the Company’s stockholders approved the adoption of the Amended and Restated 2005 Stock Plan (the “Plan”). As of December 31, 2014 under the Plan, options to purchase up to 14,195,255 shares of common stock are reserved and may be granted to employees, directors, and consultants by the Board of Directors and stockholders to promote the success of the Company’s business. Options generally vest 25% one year from the vesting commencement date and 1/48th per month thereafter. In no event are options exercisable more than ten years after the date of grant. All share totals in this note reflects a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
	At December 31, 2014, there were 1,488,494 stock options available for grant under the 2005 Plan.
	Early Exercised Stock Options
	With the approval of the Board, we allow certain employees and directors to exercise stock options granted under the 2005 Plan prior to vesting. The unvested shares are subject to a repurchase right held by the Company at the original exercise price. Early exercises of options are not deemed to be substantive exercises for accounting purposes and therefore, amounts received for early exercises are initially recorded in repurchase liability for unvested restricted stock awards. Such amounts are reclassified to common stock and additional paid-in capital as the underlying shares vest. The activity of options that were early exercised under the 2005 Plan follow for the years below:

			Early exercised				Weighted average			Weighted Average			Aggregate
			options, unvested				exercise price			Contractual Term			Intrinsic Value
										(in years)			(in thousands)
	Balance as of January 1, 2013			—			$	—
	Exercise of non-vested stock options			6,499,463				0.11
	Repurchase of restricted stock			(414,130	)			0.21
	Restricted stock vested			(491,199	)			0.1
	Balance as of December 31, 2013			5,594,134				0.12
	Exercise of non-vested stock options			865,717				0.94
	Repurchase of restricted stock			(181,893	)			0.1
	Restricted stock vested			(2,165,689	)			0.16
	Balance as of December 31, 2014			4,112,269				0.25			2.23		$	74,473
	Options expected to vest			3,674,592			$	0.25			2.23		$	66,547

	Additional information regarding the unvested early exercised stock options outstanding as of December 31, 2014 is as follows:

			Options Outstanding
	Range of		Number				Weighted –Avg.			Weighted –Avg.
	Exercise		Outstanding				Remaining Life			Exercise Price
	Prices
	$0.10 - $0.10			3,520,635				2.14		$	0.1
	0.57 - 0.57			528,495				2.64			0.57
	5.65-5.65			63,139				2.59			5.65
	$0.10 - $5.65			4,112,269				2.23		$	0.25
	Stock Option Activity
	Option activity under the 2005 Plan is summarized as follows for the years below:

			Options				Weighted-			Weighted Average			Aggregate
			Issued and				Average			Contractual Term			Intrinsic Value
			Outstanding				Exercise			(in years)			(in thousands)
							Price
	Balance as of January 1, 2013			1,173,816			$	2.03
	Options granted			7,912,933				0.1
	Options exercised – vested			(828,496	)			0.26
	Options exercised – nonvested			(6,499,463	)			0.1
	Options forefeited			(863,814	)			1.17
	Balance as of December 31, 2013			894,976			$	1.46
	Options granted			5,287,763				1.76
	Options exercised – vested			(59,150	)			1.3
	Options exercised – nonvested			(865,717	)			0.94
	Options forefeited			(262,874	)			1.79
	Balance as of December 31, 2014			4,994,998			$	1.85			8.92		$	81,219
	Options vested and expected to vest as of December 31,			4,463,370				1.85			8.92		$	72,574
	2014			4,463,370				1.85			8.92		$	72,574
	Options vested and exercisable at December 31, 2014			3,921,049			$	1.32			8.75		$	65,834
	For the year ended December 31, 2014, we granted stock options to purchase 5,287,763 shares of common stock with a weighted average exercise price of $1.76 per share, a weighted average grant date fair value of $2.45 per share and an estimated aggregate fair value of approximately $13.0 million. Options to purchase 59,150 shares with total intrinsic value of $0.3 million were exercised during the year ended December 31, 2014.
	Other Information Regarding Stock Options
	Additional information regarding common stock options outstanding as of December 31, 2014 is as follows:

				Options Outstanding										Options Vested and Exercisable
								Weighted –			Weighted –						Weighted -
	Range of							Avg.			Avg.						Avg.
	Exercise			Number				Remaining			Exercise			Number			Exercise
	Prices			Outstanding				Life			Price			Vested			Price
	$	0.10 - $0.10			163,883				8.62		$	0.1			70,784		$	0.1
		0.57 - 0.57			3,170,301				9.12			0.57			1,983,728			0.57
		1.20 - 1.20			133,334				6.71			1.2			121,874			1.2
		1.70 - 1.70			77,552				7.37			1.7			62,724			1.7
	2.00 - 2.00			287,933				5.56			2			287,869			2
	5.00 - 5.00			7,000				1.75			5			7,000			5
	5.60 - 5.60			18,250				4.71			5.6			18,250			5.6
	5.65 - 5.65			1,136,745				9.71			5.65			737			5.65
$	0.10 - $5.65			4,994,998				8.92		$	1.85			2,552,966		$	0.83
The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock-based compensation expense requires the Company to make assumptions and judgments about the variables used in the calculation, including the fair value of the Company’s common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of the Company’s common stock, a risk-free interest rate, and expected dividends. Given the absence of a publicly traded market, the Company considered numerous objective and subjective factors to determine the fair value of our common stock at each grant date. These factors included, but were not limited to, (i) contemporaneous valuations of common stock performed by unrelated third-party specialists; (ii) the prices for our Preferred Stock sold to outside investors; (iii) the rights, preferences and privileges of our Preferred Stock relative to our common stock; (iv) the lack of marketability of our common stock; (v) developments in the business; (vi) secondary transactions of our common and preferred shares and (vii) the likelihood of achieving a liquidity event, such as an initial public offering or a merger or acquisition of the Company, given prevailing market conditions. The Company also estimates forfeitures of unvested stock options. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest. As the Company’s stock is not publically traded volatility for stock options is based on an average of the historical volatilities of the common stock of several entities with characteristics similar to those of the Company. The expected term assumptions were determined based on the vesting terms, exercise terms and contractual lives of the options using the simplified method. The risk-free rate is based on the U.S. Treasury yield curve in effect at the time of grant for periods corresponding with the expected life of the option. The Company uses an expected dividend yield of zero as it does not anticipate paying any dividends in the foreseeable future. Expected forfeitures are based on the Company’s historical experience.
The fair value of the Company’s stock option awards for the year ended December 31, 2014 and 2013 was estimated at the date of grant using the Black-Scholes model with the following average assumptions:

		Year ended
		December 31,
		2014				2013
Volatility of common stock			68.28	%			75.34	%
Risk-free interest rate			1.79	%			1.78	%
Expected life		5.7 years				5.8 years
Dividend yield			0	%			0	%

Under the 2005 Stock Plan certain executive officers of the Company were granted performance-based stock options during 2014. The vesting of these performance-based stock options was contingent upon the achievement of certain revenue targets or target ratios of marketing expenditures to revenues for the year ended December 31, 2014.
The fair value of the performance-based stock options was estimated on the date of grant using the Black-Scholes option valuation model. The Company used the following assumptions in measuring the fair value of these performance-based stock options: a 66% rate for expected volatility, 0% rate for expected dividends, 5.23 years for the expected term and a 1.66% risk-free rate.

The Company granted 2,032,896 performance-based stock options with an exercise price of $0.57 per share during 2014. The contractual term of these options is 10 years. Since the performance targets were achieved, 1,924,896 performance-based stock options became fully vested and 108,000 performance-based stock options were forfeited on the termination of employment of an executive. The aggregate expense recognized during 2014 related to these performance-based stock options was $587 thousand. These shares are included in the stock option activity tables above.
The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in the Company’s consolidated statements of operations during the periods presented (in thousands):

		December 31,
		2014				2013
Origination and Servicing		$	104			$	16
Sales and Marketing			767				24
General and Administrative			1,140				206
Total stock based compensation		$	2,011			$	246
During the year ended December 31, 2014 and 2013, the Company capitalized $21 thousand, and $23 thousand, respectively, of stock-based compensation as internal use software and website development costs. Management modified or accelerated the vesting terms for certain employee options, which resulted in an additional $0.6 million and $nil of stock-based compensation expense for the year ended December 31, 2014 and 2013, respectively. As of December 31, 2014, the unamortized stock-based compensation expense related to Prosper employees’ unvested stock-based awards was approximately $5.8 million, which will be recognized over the remaining weighted-average vesting period of approximately 3.4 years.

Income_Taxes

Income Taxes	12 Months Ended
Income Taxes	Dec. 31, 2014
Income Taxes	9	Income Taxes
	The Company did not have any current or deferred federal or state income tax expense for the years ended December 31, 2014 and 2013. The income tax expense (benefit) differed from the amount computed by applying the U.S. federal income tax rate of 34% to pretax loss as a result of the following:

			Year Ended December 31,
			2014			2013
	Federal tax at statutory rate			34	%		34	%
	State tax at statutory rate (net of federal benefit)			1	%		2	%
	Permanent items			31	%		0	%
	Stock compensation			(9	)%		0	%
	Change in valuation allowance			(66	)%		(38	)%
	Credits and Reserves			9	%		(—	)%
	Other			0	%		2	%
				0	%		0	%
	Temporary items that give rise to significant portions of deferred tax assets and liabilities (tax-effected) at December 31, 2014 and 2013 are as follows (in thousands):

			December 31,
			2014			2013
	Net operating loss carry forwards		$	24,565		$	24,626
	Research & other credits			420			277
	Fixed assets			45			95
	Settlement liability			2,964			3,654
	Stock compensation			344			69
	Accrued liabilities and other			2,320			247
				30,658			28,968
	Fair value of loans			(1,160	)		(1,078	)
	Valuation allowance			(29,498	)		(27,890	)
	Net deferred tax asset		$	—		$	—
	The valuation allowance as of December 31, 2014, increased by $1.6 million to ($29.5) million from ($27.9 million in the prior fiscal year, an increase of 6%. Under ASC 740, Accounting for Income Taxes (“ASC Topic 704”), a valuation allowance must be established when it is more likely than not that all or a portion of a deferred tax asset will not be realized. The amount of valuation allowance would be based upon management’s best estimate of the Company’s ability to realize the net deferred tax assets. A valuation allowance can subsequently be reversed when management believes that the assets are realizable on a more-likely-than-not basis.
	The Company has determined that its net deferred tax asset did not satisfy the recognition criteria set forth in ASC Topic 740 and, accordingly, established a valuation allowance for 100 percent of the net deferred tax asset. Realization of the deferred tax assets is dependent upon future earnings, if any, the amount and timing of which are uncertain. Accordingly, the net deferred tax assets have been fully offset by a valuation allowance of $29.5 million and $27.9 million for the year ended December 31, 2014 and 2013, respectively.
	The Tax Reform Act of 1986 and similar California legislation impose substantial restrictions on the utilization of net operating losses and tax credits in the event of an “ownership change” of a corporation. Accordingly, the Company’s ability to utilize net operating losses and credit carryforwards may be limited in the future as the result of such an “ownership change.”
	The Company files Federal and various state income tax returns. The Company has net operating loss carryforwards for both federal and state income tax purposes of approximately $69.5 million and $83.8 million respectively as of December 31, 2014, available to reduce future income subject to income taxes. The federal net operating loss carryforwards will begin to expire in 2025. The state net operating loss carryforwards will begin to expire in 2015. The Company also has federal and California research and development tax credits of approximately $nil and $450, respectively. The California research credits have no expiration date.
	As of December 31, 2014, the Company’s federal and state tax returns for the years ended December 31, 2011 and December 31, 2010, respectively, through the current period are open to examination. In addition, all of the net operating losses and credits that may be used in future years are still subject to adjustment.
	The following table summarizes the Company’s activity related to its unrecognized tax benefits (in thousands):

			December 31,			December 31,
			2014			2013
	Balance at January 1,		$	54,571		$	219
	Increase related to current year tax position		—			—
	Increase related to tax position of prior years		—				54,352
	Balance at December 31,		$	54,571		$	54,571
	A total of $54.6 million of the unrecognized tax benefits would affect the Company’s effective tax rate. The Company currently has a full valuation allowance against its U.S. net deferred tax assets which would impact the timing of the effective tax rate benefit should any of these uncertain tax positions be favorably settled in the future.
	The Company’s policy is to recognize interest and penalties accrued on any unrecognized tax benefits as a component of income tax expense. As of December 31, 2014, the Company has not incurred any interest or penalties.

Prosper Funding LLC [Member]
Income Taxes	6	Income Taxes
	PFL incurred no income tax provision for the year ended December 31, 2014 and 2013. PFL is a US disregarded entity and the income and loss is included in the return of its parent, PMI. Since PMI is in a loss position, not currently subject to income taxes, and has fully reserved its deferred tax asset, the net effective tax rate for PFL is 0%.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2014
Commitments and Contingencies	10	Commitments and Contingencies
	Future Minimum Lease Payments
	During the period the Company signed new leases for the new corporate headquarters at 221 Main Street in San Francisco California and for the co-location facility. These are non-cancelable operating leases that expire in February 2023 and August 2015, respectively. The Company also signed a new lease for office space in Phoenix Arizona under an operating lease that expires in June 2022.
	Future minimum rental payments under these leases as of December 31, 2014 are as follows (in thousands $) :

	2015			2,425
	2016			3,755
	2017			3,866
	2018			3,977
	2019			4,093
	Thereafter			13,091
	Total future operating lease obligations		$	31,207

	Rental expense under operating lease arrangements was $2.0 million and $0.6 million for the years ended December 31, 2014 and 2013, respectively.
	Operating Commitments
	The Company amended and restated an agreement with WebBank, under which all Borrower Loans originated through the platform are made by WebBank under its bank charter. The arrangement allows for Borrower Loans to be offered to borrowers at uniform nationwide terms. The Company is required to pay the greater of a monthly minimum fee or a fee calculated based on a certain percentage of monthly Borrower Loan origination volume. The minimum annual fee for year ended December 31, 2015 is $1.4 million.
	Loan Purchase Commitments
	The Company has entered into an agreement with WebBank to purchase $16.7 million of borrower loans that WebBank is originating within the first two business days of fiscal 2015.
	Repurchase and Indemnification Contingency
	Under the terms of the loan purchase agreements between the Company and investor members that participate in the Whole Loan Channel, the Company may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor member. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow loan listing or bidding protocols, or a violation of the applicable federal, state, or local lending laws. The fair value of the indemnification and repurchase obligation is estimated based on historical experience and the initial fair value is insignificant. The Company recognizes a liability for the repurchase and indemnification obligation when the Borrower Loans are issued. Indemnified or repurchased Borrower Loans associated with violations of federal, state, or local lending laws or verifiable identity theft are written off at the time of repurchase or at the time an indemnification payment is made. The maximum potential amount of future payments associated under this obligation is the outstanding balances of the borrower loans issued Whole Loan channels, which at December 31, 2014 is $1,358 million. The Company had accrued $171 thousand and $40 thousand as of December 31, 2014 and 2013 respectively in regard to this obligation.

	Securities Law Compliance
	From inception through October 16, 2008, the Company sold approximately $178.0 million of Borrower Loans to investor members through the old platform structure, whereby the Company assigned promissory notes directly to investor members. The Company did not register the offer and sale of the promissory notes corresponding to these Borrower Loans under the Securities Act or under the registration or qualification provisions of any state securities laws. The Company believes that the question of whether or not the operation of the platform during this period constituted an offer or sale of “securities” involved a complicated factual and legal analysis and was uncertain. If the sales of promissory notes offered through the platform during this period were viewed as a securities offering, the Company would have failed to comply with the registration and qualification requirements of federal and state laws.
	The Company’s decision to restructure the platform and cease sales of promissory notes offered through the platform effective October 16, 2008 limited this contingent liability to the period covering its activities prior to October 16, 2008.
	On April 21, 2009, the Company and the North American Securities Administrators Association (“NASAA”) reached agreement on the terms of a model consent order between the Company and the states in which PMI, under its initial platform structure, offered promissory notes for sale directly to investor members prior to November 2008. The agreement with NASAA contemplates payment by the Company of up to an aggregate of $1 million in penalties, which have been allocated among the states based on the Company’s promissory note sale transaction volume in each state prior to November 2008. A state that enters into a consent order receives its portion of the $1 million in exchange for its agreement to terminate, or refrain from initiating, any investigation of the Company’s promissory note sale activities prior to November 2008. Penalties are paid promptly after a state enters into a consent order. NASAA has recommended that each state enter into a consent order; however, no state is obliged to do so, and there is no deadline by which a state must make its decision. The Company is not required to pay any portion of the penalty to those states that do not elect to enter into a consent order. If a state does not enter into a consent order, it is free to pursue its own remedies against the Company, subject to any applicable statute of limitations. As of December 31, 2014, the Company has entered into consent orders with 34 states and has paid an aggregate of $0.47 million in penalties to those states.
	As of December 31, 2014 and December 31, 2013, the Company had accrued approximately $0.25 million and $0.25 million, respectively, in connection with the contingent liability associated with the states that have not entered into consent orders, in accordance with ASC Topic 450, Contingencies. The methodology applied to estimate the accrual was to divide the $1 million maximum fee pro-rata by state, using the Company’s promissory note sales from inception through November 2008. A weighting was then applied by state to each state that has not entered into a consent order, assigning a likelihood that the penalty will be claimed. In estimating the probability of a claim being made by a state, the Company considered factors such as the standard terms of the consent orders; whether the state ever gave any indication of concern regarding the sale of promissory notes through the platform; the probability of a state electing not to enter into a consent order in order to pursue its own litigation against the Company; whether the penalty is sufficient to compensate a state for the cost of processing the settlement consent order; and finally the impact that current economic conditions have had on state governments. The Company will continue to evaluate this accrual and related assumptions as new information becomes known.
	In 2008, plaintiffs filed a class action lawsuit against the Company and certain of its executive officers and directors in the Superior Court of California, County of San Francisco, California. The suit was brought on behalf of all promissory note purchasers on the platform from January 1, 2006 through October 14, 2008. The lawsuit alleged that the Company offered and sold unqualified and unregistered securities in violation of the California and federal securities laws. On July 19, 2013 solely to avoid the costs, risks and uncertainties inherent in litigation, and without admitting any liability or wrongdoing, the parties to the class action litigation agreed to enter into a settlement to resolve all claims related thereto (the “Settlement”). In connection with the Settlement, the Company agreed to pay an aggregate amount of $10 million into a settlement fund, split into four annual installments of $2 million in 2014, $2 million in 2015, $3 million in 2016 and $3 million in 2017. The Settlement received final approval in a final order and judgment entered by the Superior Court on April 16, 2014. Pursuant to the final order and judgment, the claims in the class action were dismissed, and at the effective time of the Settlement (June 16, 2014), the defendants will have been released by the plaintiffs from all claims that were or could have been asserted concerning the issues alleged in the class action lawsuit. The reserve for the class action settlement liability is $7.9 million in the condensed consolidated balance sheet as of December 31, 2014.

Prosper Funding LLC [Member]
Commitments and Contingencies	7	Commitments and Contingencies
	Operating Commitments
	The Company amended and restated an agreement with WebBank, under which all Borrower Loans originated through the platform are made by WebBank under its bank charter. The arrangement allows for Borrower Loans to be offered to borrowers at uniform nationwide terms. The Company is required to pay the greater of a monthly minimum fee or a fee calculated based on a certain percentage of monthly Borrower Loan origination volume. The minimum annual fee for year ended December 31, 2015 is $1.4 million.
	Loan Purchase Commitments
	The Company has entered into an agreement with WebBank to purchase $16.7 million of borrower loans that WebBank is originating within the first two business days of fiscal 2015.
	Repurchase and Indemnification Contingency
	Under the terms of the loan purchase agreements between the Company and investor members that participate in the Whole Loan Channel, the Company may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor member. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow loan listing or bidding protocols, or a violation of the applicable federal, state, or local lending laws. The fair value of the indemnification and repurchase obligation is estimated based on historical experience and the initial fair value is insignificant. The Company recognizes a liability for the repurchase and indemnification obligation when the Borrower Loans are issued. Indemnified or repurchased Borrower Loans associated with violations of federal, state, or local lending laws or verifiable identity theft are written off at the time of repurchase or at the time an indemnification payment is made. The maximum potential amount of future payments associated under this obligation is the outstanding balances of the borrower loans issued Whole Loan channels, which at December 31, 2014 is $1,358 million. The Company had accrued $171 thousand and $40 thousand as of December 31, 2014 and 2013 respectively in regard to this obligation.

Related_Parties

Related Parties	12 Months Ended
Related Parties	Dec. 31, 2014
Related Parties	11	Related Parties
	Since Prosper’s inception, it has engaged in various transactions with its directors, executive officers and holders of more than 10% of its voting securities, and immediate family members and other affiliates of its directors, executive officers and 10% stockholders. Prosper believes that all of the transactions described below were made on terms no less favorable to Prosper than could have been obtained from unaffiliated third parties.
	Prosper’s executive officers, directors who are not executive officers and certain affiliates participate on Prosper’s marketplace by purchasing Notes. The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper as of December 31, 2014 and 2013 are summarized below (in thousands):

			Aggregate Amount of				Interest Earned on
	Related Party		Notes Purchased				Notes
			2014		2013		2014		2013
	Executive officers and management		$	1,127	$	1,096	$	163	$	12
	Directors			42		727		10		52
	Total		$	1,169	$	1,823	$	173	$	64

	Related Party		Notes balance as of December 31,
			2014		2013
	Executive officers and management		$	1,614	$	1,067
	Directors			76		322
			$	1,690	$	1,389
	Prosper has earned approximately $13 thousand and $1 thousand in servicing fee revenue related to these Notes for the years ended December 31, 2014 and 2013, respectively.

Prosper Funding LLC [Member]
Related Parties	8	Related Parties
	Since PMI’s inception, it has engaged in various transactions with its directors, executive officers and holders of more than 10% of its voting securities, and immediate family members and other affiliates of its directors, executive officers and 10% stockholders. PFL believes that all of the transactions described below were made on terms no less favorable to PMI than could have been obtained from unaffiliated third parties.
	PFL’s executive officers, directors who are not executive officers and certain affiliates participate on PFL’s lending platform by placing bids and purchasing Notes. The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be affiliates and related parties of Prosper as of December 31, 2014 and 2013 are summarized below (in thousands):

			Aggregate Amount of
			Notes and Borrower				Interest Earned on
			Loans				Notes and Borrower
	Related Party		Purchased				Loans
			2014		2013		2014		2013
	Executive officers and management		$	1,127	$	1,170	$	159	$	1
	Directors			—		—		—		—
	Total		$	1,127	$	1,170	$	159	$	1

	Related Party		Loan balance as of December 31,
			2014		2013
	Executive officers and management		$	1,614	$	1,065
	Directors			—		—
	Total		$	1,614	$	1,065

	PMI has earned approximately $13 thousand and $1 thousand in servicing fee revenue related to these Notes and Borrower Loans for the years ended December 31, 2014 and 2013, respectively.

Postretirement_Benefit_Plans

Postretirement Benefit Plans	12 Months Ended
	Dec. 31, 2014
Compensation And Retirement Disclosure [Abstract]
Postretirement Benefit Plans	12	Postretirement Benefit Plans
	The Company has a 401(k) plan that covers all employees meeting certain eligibility requirements. The 401(k) plan is designed to provide tax-deferred retirement benefits in accordance with the provisions of Section 401(k) of the Internal Revenue Code. Eligible employees may defer up to 90% of eligible compensation up to the annual maximum as determined by the Internal Revenue Service. The Company’s contributions to the plan are discretionary. During the years ended December 31, 2014 and 2013, the Company has contributed $0.38 million and $nil to the 401(k) plan.

Significant_Concentrations

Significant Concentrations	12 Months Ended
	Dec. 31, 2014
Significant Concentrations	13	Significant Concentrations
	The Company is dependent on third party funding sources such as banks and investment funds to provide the funds to allow WebBank to originate Borrower Loans that the third party funding sources will later purchase. Of all Borrower Loans originated in the year ended December 31, 2014, 37%, 13% and 22% were purchased by three different parties. This compares to 31%, 16% and 4% for the year ended December 31, 2013.
	The Company receives all of its transaction fee revenue from WebBank. The transaction fee represents the origination fee that WebBank collects from the borrower when WebBank issues the Borrower Loan. The Company sets the rate of the origination fee for each individual Borrower Loan based on the term and credit grade of the Borrower Loan.
Prosper Funding LLC [Member]
Significant Concentrations	9	Significant Concentrations
	The Company is dependent on third party funding sources such as banks and investment funds to provide the funds to allow WebBank to originate loans that the third party funding sources will later purchase. Of all Borrower Loans originated in the year ended December 31, 2014, 37%, 13% and 22% were purchased by three different parties. This compares to 31%, 16% and 4% for the year ended December 31, 2013.

Segments

Segments	12 Months Ended
	Dec. 31, 2014
Segment Reporting [Abstract]
Segments	14	Segments
	Our chief operating decision maker reviews financial information presented on a consolidated basis for purposes of allocating resources and evaluating financial performance. As such, we have a single reporting segment and operating unit structure.

Prior_Period_Adjustments

Prior Period Adjustments	12 Months Ended
Prior Period Adjustments	Dec. 31, 2014
Condensed Financial Statements Captions [Line Items]
Prior Period Adjustments	15	Restatement of Consolidated Financial Statements
	Subsequent to the issuance of our consolidated financial statements for the year ended December 31, 2013 certain errors were discovered and the December 31, 2013 financial statements presented herein have been restated to correct these errors which are described below and summarized in the tables that follow.
	Certain bank accounts were previously not recorded on the balance sheet as of December 31, 2013. The use of the cash in these bank accounts is restricted and may only be used by the Company to fund Borrower Loans, at Fair Value on which investors have bid. The cash in these bank accounts should have been recognized as restricted cash on our Balance Sheet and a related payable to investors should also have been recognized. This resulted in an understatement of restricted cash and Payable to Investors of approximately $35.6 million.
	Additionally the Company discovered that certain fees that the Company pays to WebBank were incorrectly classified as expenses. Since WebBank is a customer of the Company and the Company earns transaction fees from WebBank any cash consideration paid to WebBank should be recorded as reduction of the transaction fees earned by the Company. This resulted in a $1.3 million overstatement of Transaction Fee revenues and Origination and Servicing expenses for the year ended December 31, 2013.
	The Company also discovered that certain rebates offered on the sale of loans and Notes were incorrectly classified as Transaction Fee revenue and should have been classified as Other Revenue or Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes. This resulted in an understatement of transaction fee revenues of $1.1 million, an overstatement of Other Revenues and an Overstatement of the Change in Fair Values of Borrower Loans, Loans Held for Sale and Notes of $0.55 million.
	The Company also discovered that Convertible Preferred Stock was incorrectly classified within permanent stockholders’ equity in its consolidated balance sheet as of December 31, 2013. Since the Convertible Preferred Stockholders are entitled to receive their liquidation preference upon a change-in-control transaction the Convertible Preferred Stock should be classified as temporary equity. This resulted in a $44.8 million reclassification of the Convertible Preferred Stock from permanent equity to temporary equity as of December 31, 2013.
	Additionally, the Company discovered certain errors in its valuation of servicing assets and liabilities which resulted in an overstatement of net loan servicing rights and an understatement of the gain recognized on the sale of loans which was included in Other Revenues for the year ended December 31, 2013 by approximately $0.25 million. Furthermore, the Company inappropriately classified loan servicing rights in Borrower Loans Receivable at Fair Value. The Company corrected this error by reclassifying the gross serving assets of $0.4 million to Prepaid and Other Assets and recognized the servicing liabilities of $0.17 million in Accounts Payable and Other Liabilities.
	The Company also discovered an error related to measurement of the Class Action Settlement Liability. Upon the court’s approval of the settlement during the quarter ended December 31, 2013, this liability became payable at fixed future dates and therefore the Company should have recognized the liability based on the present value of the future payments rather than the gross amount of such future payments. This error resulted in an overstatement of the Class Action Settlement Liability and the General and Administrative expense recognized as of and for the year ended December 31, 2013 of $0.26 million.
	Additionally, the Company also discovered a misclassification related to the presentation of interest receivable and payable. Previously these two amounts were incorrectly netted against each other. These amounts should have been recorded gross and as a result Borrower Loans and Notes were understated by $1.9 million as of December 31, 2013.
	The Company also discovered that the fair value of the Borrower Loans and Notes were understated as a result of inappropriately aggregating certain loans when determining the fair value of Borrower Loans and Notes. This resulted in an understatement of the Borrower loans of $4.8 million and the Notes of $4.6 million at December 31, 2013.
	Additionally, the Company discovered that it had not recorded Notes issued on the correct date, resulting in an understatement of the Notes balance by $0.8 million and an overstatement of Payable to Investors by $0.8 million at December 31, 2013.
	The Company also discovered errors related to capitalized internal use software and website development costs including an impairment of $0.24 million that was not recorded and assets were being amortized over a time period that exceed their useful life which understated amortization by $0.13 million. As a result Property and Equipment was overstated by $0.37 million at December 31, 2014.
	Additionally the Company discovered errors related to timing of when payments were applied to Note balances. This resulted in an overstatement of the Note balances and an understatement of the Payable to Investors balance, both for $1.4 million at December 31, 2013.

	In addition to the restatements described above, the Company has made other corrections, some of which were previously identified, but were not corrected because management had determined they were not material, individually or in the aggregate, to our consolidated financial statements. These corrections related to the fair value of loans held for investment, reclassification of certain loans from loans held for investment to Borrower Loans, amortization of prepaid assets, estimation of various accruals and a correction for vesting of options that were early exercised. The effect of correcting these errors for the fiscal year ended December 31, 2013 is summarized below.
	Additionally, the Company has corrected certain disclosures, the most significant of which is the amount of the gross deferred tax asset related to our NOL carryforward and the amount of the related valuation allowance were overstated by $12.0 million as a result of certain transactions that occurred during the year end December 31, 2013 that limit our ability to carry forward net operating losses.
	Lastly, the Company discovered the following errors within its Consolidated Statement of Cash Flows for the year ended December 31, 2013:
	×	Changes in certain Restricted Cash balances related to investing activities were inappropriately classified as changes in cash flows from operating activities rather than changes in cash flows from investing activities.
	×	Cash flows from the principal payments and proceeds from sale related to Borrower Loans held for sale were inappropriately classified within cash flows from investing activities rather than cash flows from operating activities.
	×	A portion of the change in fair value of Borrower Loans and Notes was inappropriately reflected as a cash flow from investing and financing activities, respectively, rather than an adjustment to reconcile net income to net cash used in operating activities.
	×	Other changes related to the correction of errors in the balance sheet and statement of operations as described above.
	The aggregate impact of these errors were an understatement of cash flows from operating activities of $3.2 million; an overstatement of cash flows from investing activities of $19.0 million; and an $15.8 million understatement of cash flows from financing activities for the year ended December 31, 2013.
	Finally, the Company corrected the number of outstanding common shares on the face of the balance sheet and in the Statements of Stockholders’ Equity as a result of an error in the calculation of restricted shares repurchased. The number of common shares outstanding at December 31, 2013 was previously stated as 13,902,478 and has been corrected to 13,588,803. The Company also corrected its calculation of basic and diluted earnings per share for the changes to net income and an error in the calculation of the weighted average shares which resulted in an understatement of the weighted average shares by 29,626 shares and overstates the net loss per share by $0.02 per share.

	The following tables present the impact of these corrections on the 2013 consolidated financial statements (in thousands, expect per share values):
	Consolidated Balance Sheet - December 31, 2013

			As previously								As
			reported				Reclassifications				reclassified				Adjustments				As Restated
	ASSETS
	Cash and Cash Equivalents		$	18,339			$	—			$	18,339			$	—			$	18,339
	Restricted Cash			15,473				—				15,473				34,351				49,824
	Short Term Investments			—				—				—				1,271				1,271
	Accounts Receivable			218				—				218				78				296
	Loans Held for Sale, at Fair Value			3,917				—				3,917				(711	)			3,206
	Borrower Loans, at Fair Value			226,238				—				226,238				6,867				233,105
	Property and Equipment, Net			3,396				—				3,396				(370	)			3,026
	Prepaid and Other Assets			708				—				708				484				1,192
	Total Assets			268,289				—				268,289				41,970				310,259
	LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS'
	EQUITY (DEFICIT)
	Accounts Payable and Accrued Liabilities			6,737				(3,690	)			3,047				341				3,388
	Payable to Investors			—				2,480				2,480				35,545				38,025
	Class Action Settlement Liability			10,000				—				10,000				(261	)			9,739
	Notes, at Fair Value			226,794				1,242				228,036				6,182				234,218
	Repurchase and Indemnification Obligation			32				(32	)			—				—				—
	Repurchase Liability for Unvested Restricted Stock Awards			609				—				609				(50	)			559
	Total Liabilities			244,172				—				244,172				41,757				285,929

	Convertible Preferred Stock			—				—				—				44,822				44,822

	Stockholders' Equity (Deficit)
	Convertible Preferred Stock			273				—				273				(273	)			—
	Common Stock			75				—				75				—				75
	Additional Paid-In Capital			128,140				—				128,140				(44,464	)			83,676
	Less: Treasury Stock			(291	)			—				(291	)			—				(291	)
	Accumulated Deficit			(104,080	)			—				(104,080	)			128				(103,952	)
	Total Stockholders' Equity (Deficit)			24,117				—				24,117				(44,609	)			(20,492	)
	Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		$	268,289			$	—			$	268,289			$	41,970			$	310,259

	Consolidated Statement of Operations – Year ended December 31, 2013

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
reported
Revenues
Operating Revenues
Transaction Fees, Net		$	16,471			$	(1,094	)		$	15,377			$	(47	)		$	15,330
Rebates and promotions			(1,534	)			1,534				—				—				—
Servicing Fees, Net			—				(69	)			(69	)			328				259
Other Revenues			—				1,274				1,274				(337	)			937
Total Operating Revenues			14,937				1,645				16,582				(56	)			16,526
Interest Income
Interest Income on Borrower Loans			35,526				(609	)			34,917				78				34,995
Interest Expense on Notes			(33,072	)			118				(32,954	)			(367	)			(33,321	)
Net Interest Income			2,454				(491	)			1,963				(289	)			1,674
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net			877				—				877				(696	)			181
Total Net Revenues			18,268				1,154				19,422				(1,041	)			18,381
Cost of Revenues
Cost of Services			(2,056	)			2,056				—				—				—
Provision for repurchase and indemnification obligation			(118	)			118				—				—				—
			(2,174	)			2,174				—				—				—
Expenses																			—
Compensation and benefits			13,079				(13,079	)			—				—				—
Marketing and advertising			14,851				(14,851	)			—				—				—
Depreciation and amortization			961				(961	)			—				—				—
Professional services			1,979				(1,979	)			—				—				—
Facilities and maintenance			1,764				(1,764	)			—				—				—
Class action settlement			10,000				(10,000	)			—				—				—
Loss on impairment			62				(62	)			—				—				—
Other			1,733				(1,733	)			—				—				—
Origination and Servicing			—				7,465				7,465				(1,081	)			6,384
Sales and Marketing			—				16,740				16,740				(9	)			16,731
General and Administrative			—				22,398				22,398				(125	)			22,273
Total Expenses			44,429				2,174				46,603				(1,215	)			45,388
Interest income			3				(3	)			—				—				—
Other income			1,151				(1,151	)			—				—				—
Net Loss		$	(27,181	)		$	—			$	(27,181	)		$	174			$	(27,007	)

Consolidated Statement of Cash Flows – Year ended December 31, 2013

		As previously
		reported				Adjustments				As Restated
Cash Flows from Operating Activities:
Net Loss		$	(27,181	)		$	174			$	(27,007	)
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans Receivable			4,856				5,705				10,561
Change in Fair Value of Loans Held For Sale			1				(56	)			(55	)
Change in Fair Value of Notes			(5,734	)			(5,793	)			(11,527	)
Depreciation and Amortization			961				133				1,094
Change in Servicing Rights			—				(329	)			(329	)
Stock-Based Compensation Expense			229				17				246
Loss on Impairment of Property and Equipment			62				237				299
Class Action Settlement Liability			10,000				(261	)			9,739
Purchases of loans held sale			—				(184,807	)			(184,807	)
Proceeds from the sale of loans held for sale			—				181,656				181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities			(9,524	)			(11,681	)			(21,205	)
Accounts Receivable			(126	)			(130	)			(256	)
Prepaid and Other Assets			(332	)			12				(320	)
Accounts Payable and Accrued Liabilities			1,962				(2,731	)			(769	)
Payable to Investors			—				21,028				21,028
Net cash used in Operating Activities			(24,826	)			3,174				(21,652	)
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value			(341,176	)			171,317				(169,859	)
Principal Payments of Borrower Loans Held at Fair Value			105,692				(15,638	)			90,054
Proceeds from Sale of Borrower Loans Held at Fair Value			171,290				(171,290	)			—
Purchases of Property and Equipment			(2,889	)			175				(2,714	)
Maturities of Short Term Investments			1,000				1,619				2,619
Purchases of Short Term Investments			—				(1,271	)			(1,271	)
Repayment of Loans Held for Investment at Fair Value			143				(143	)			—
Origination of Loans Held for Investment at Fair Value			(14,296	)			14,296				—
Proceeds from sale of Borrower Loans at Fair Value			10,410				(10,410	)			—
Changes in Restricted Cash Related to Investing Activities			—				(7,685	)			(7,685	)
Net Cash Used in Investing Activities			(69,826	)			(19,030	)			(88,856	)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value			169,742				844				170,586
Payment of Notes Held at Fair Value			(104,692	)			15,011				(89,681	)
Proceeds from Issuance of Convertible Preferred Stock, Net			44,822				—				44,822
Proceeds from Early Exercise of Stock Options			650				44				694
Repurchase of Restricted Stock			(41	)			(45	)			(86	)
Proceeds from Exercise of Vested Stock Options			210				2				212
Net Cash Provided by Financing Activities			110,691				15,856				126,547
Net Increase (Decrease) in Cash and Cash Equivalents			16,039				—				16,039
Cash and Cash Equivalents at Beginning of the Year			2,300				—				2,300
Cash and Cash Equivalents at end of the year		$	18,339							$	18,339
Cash Paid for Interest		$	—			$	35,027			$	35,027
Non-Cash Investing Activity- Accrual for Property and Equipment, Net		$	—			$	175			$	175

Prosper Funding LLC [Member]
Condensed Financial Statements Captions [Line Items]
Prior Period Adjustments	10	Prior Period Adjustments
	Subsequent to the issuance of our consolidated financial statements for the year ended December 31, 2013 certain errors were discovered and the December 31, 2013 balances presented herein have been restated to correct these errors. These errors are described below and in the tables that follow.
	Certain bank accounts were previously not recorded on the balance sheet as of December 31, 2013. The use of the cash in these bank accounts is restricted and may only be used by the Company to fund Borrower Loans, at Fair Value on which investors have bid. The cash in these bank accounts should have been recognized as restricted cash on our Balance Sheet and a related Payable to Investors should also have been recognized. This resulted in an understatement of Restricted Cash and Payable to Investors of $35.6 million.
	Additionally, the Company also discovered a misclassification related to the presentation of interest receivable and payable. Previously these two amounts were incorrectly netted against each other. These amounts should have been recorded gross and as a result Borrower Loans and Notes were both understated by $1.9 million.
	The Company also discovered that the fair value of the Borrower Loans and Notes were understated as a result of inappropriately aggregating certain loans when determining the fair value of Borrower Loans and Notes. This resulted in an understatement of the Borrower loans of $4.8 million and the Notes of $4.6million at December 31, 2013.
	Additionally, the Company discovered that it had not recorded Notes issued on the correct date, resulting in an understatement of the Notes balance by $0.8 million and an overstatement of investor payables by $0.8 million.
	Additionally the Company discovered errors related to timing of when payments were applied to Note balances. This resulted in an overstatement of the Note balances and an understatement of the investor payable balance, both for $1.4 million at December 31, 2013
	Additionally, the Company discovered certain errors in its valuation of servicing assets and liabilities which resulted in an overstatement of net loan servicing rights and an understatement of the gain recognized on the sale of loans which was included in other revenues for the year ended December 31, 2013 by approximately $0.25 million. Furthermore, the Company inappropriately classified loan servicing rights in Borrower Loans Receivable at Fair Value. The Company corrected this error by reclassifying the gross serving assets of $0.4 million to Prepaid and Other Assets and recognized the servicing liabilities of $0.17 million in Accounts Payable and Other Liabilities.
	In addition to the restatements described above, the Company has made other corrections, some of which were previously identified, but were not corrected because management had determined they were not material, individually or in the aggregate, to our consolidated financial statements. These corrections related to the fair value of loans held for investment, amortization of internal use software, reclassification of certain loans from loans held for investment to Borrower Loans and estimation of various accruals. The effect of correcting these errors for the fiscal year ended December 31, 2013 is summarized below.
	Additionally, PFL discovered the following classification errors within its Condensed Consolidated Statement of Cash Flows for the year ended December 31, 2013:
	×	Changes in certain Restricted Cash balances related to investing activities were inappropriately classified as changes in cash flows from operating activities rather than changes in cash flows from investing activities.
	×	Cash flows from the principal payments and proceeds from sale related to Borrower Loans held for sale were inappropriately classified within cash flows from investing activities rather than cash flows from operating activities.
	×	A portion of the change in fair value of Borrower Loans and Notes was inappropriately reflected as a cash flow from investing and financing activities, respectively, rather than an adjustment to reconcile net income to net cash used in operating activities.
	×	Other changes related to the correction of errors in the balance sheet and statement of operations as described above.
	The following tables present the impact of these corrections on the 2013 consolidated financial statements (in thousands, expect per share values):
	Condensed Consolidated Balance Sheet - December 31, 2013

			As previously								As
			reported				Reclassifications				Reclassified				Adjustments				As restated
	Assets
	Cash and Cash Equivalents		$	5,789			$	—			$	5,789			$	—			$	5,789
	Restricted Cash			12,299				—				12,299				34,351				46,650
	Short Term Investments			—				—				—				1,271				1,271
	Loans Held for Sale, at Fair Value			3,917				—				3,917				(711	)			3,206
	Borrower Loans Receivable, at Fair Value			226,238				—				226,238				6,866				233,104
	Property and Equipment, Net			1,980				—				1,980				(370	)			1,610
	Other Assets			14				—				14				429				443
	Total Assets			250,237				—				250,237				41,836				292,073
	Liabilities and Member's Equity
	Accounts Payable and Accrued Liabilities			3,712				(3,690	)			22				383				405
	Payable to Investors			—				2,480				2,480				35,541				38,021
	Notes, at Fair Value			226,794				1,242				228,036				6,182				234,218
	Repurchase and Indemnification Obligation			32				(32	)			—				—				—
	Related Party Payable			205				—				205				—				205
	Total Liabilities			230,743				—				230,743				42,106				272,849
	Member's Equity
	Member's Equity			16,076				—				16,076				(240	)			15,836
	Retained Earnings (Accumulated Deficit)			3,418				—				3,418				(30	)			3,388
	Total Member's Equity			19,494				—				19,494				(270	)			19,224
	Total Liabilities and Member's Equity		$	250,237			$	—			$	250,237			$	41,836			$	292,073

	Consolidated Statement of Operations – Year ended December 31, 2013

			As				Reclassifications				As				Adjustments				As restated
			previously								reclassified
			reported
	Revenues
	Operating Revenues
	Administration Fee Revenue – Related Party		$	7,632			$	—			$	7,632			$	—			$	7,632
	Servicing Income, Net			—				397				397				(25	)			372
	Other Revenues			—				28				28				205				233
	Total Operating Revenues			7,632				425				8,057				180				8,237
	Interest Income on Borrower Loans			32,862				(397	)			32,465				140				32,605
	Interest Expense on Notes			(30,564	)			—				(30,564	)			(192	)			(30,756	)
	Net Interest Income			2,298				(397	)			1,901				(52	)			1,849
	Change in Fair Value on Borrower Loans, Loans Held for Sale and Notes, net			877				—				877				(28	)			849
	Total Net Revenues			10,807				(397	)			10,835				100				10,935
	Cost of Revenues
	Cost of Services			(1,270	)			1,270				—				—				—
	Provision for repurchase and indemnification obligation			(83	)			83				—				—				—
				(1,353	)			1,353				—				—				—
	Expenses															—				—
	Servicing			—				1,891				1,891				131				2,022
	Administration Fee – Related Party			5,053								5,053				—				5,053
Depreciation and Amortization			538				(538	)			—				—				—
Professional Services			26				(26	)			—				—				—
Other Operating Expenses			242				(242	)			—				—				—
General and Administration			—				268				268				(1	)			267
Total Expenses			5,859				1,353				7,212				130				7,342

Other income			28				(28	)			—				—				—
Total Net Income		$	3,623			$	—			$	3,623			$	(30	)		$	3,593

Condensed Consolidated Statements of Cash Flows – Year ended December 31, 2013

		As previously
		reported				Adjustments				As restated
Cash flows from operating activities:
Net Income		$	3,623			$	(30	)		$	3,593
Adjustments to Reconcile Net Income (Loss) to Net Cash Used in Operating Activities:
Change in Fair Value of Notes			(5,734	)			(5,646	)			(11,380	)
Change in Fair Value of Borrower Loans Receivable			4,856				5,776				10,632
Change in Fair Value of Loans Held for Sale			1				(45	)			(44	)
Depreciation and Amortization			538				133				671
Change in Servicing Rights			—				(292	)			(292	)
Purchase of loans held for at fair value			—				(184,807	)			(184,807	)
Proceeds from sales of Loans Held for Sale at fair value			—				181,645				181,645
Changes in Operating Assets and Liabilities:
Restricted Cash			(8,155	)			(9,291	)			(17,446	)
Other Assets			(13	)			5				(8	)
Accounts Payable and Accrued Liabilities			2,924				(2,817	)			107
Payable to Investors			—				19,925				19,925
Net Related Party Payable			205				—				205
Net Cash Used in Operating Activities			(1,755	)			4,556				2,801
Cash Flows From Investing Activities:
Purchase of Borrower Loans Receivable Held at Fair Value			(331,353	)			171,316				(160,037	)
Principle Payment of Borrower Loans Receivable Held at Fair Value			99,313				(99,313	)			—
Proceeds from Sale of Borrower Loans Receivable Held at Fair Value			171,290				(87,613	)			83,677
Repayment of Loans Held for Investment at Fair Value			143				(143	)			—
Origination of Loans Held for Investment at Fair Value			(14,296	)			14,296				—
Proceeds from sale of Borrower Loans at Fair Value			10,410				(10,410	)			—
Purchases of Property and Equipment			(1,798	)			1				(1,797	)
Changes in Restricted Cash Related to Investing Activities			—				(8,576	)			(8,576	)
Net Cash Used in Investing Activities			(66,291	)			(20,442	)			(86,733	)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value			159,921				843				160,764
Payment of Notes Held at Fair Value			(97,967	)			15,043				(82,924	)
Cash infusion from parent			10,001				—				10,001
Net Cash Included in Transfer of Assets from Parent			1,875				—				1,875
Net Cash Provided by Financing Activities			73,830				15,886				89,716
Net Increase in Cash and Cash Equivalents			5,784				—				5,784
Cash and Cash Equivalents at Beginning of the Period			5				—				5
Cash and Cash Equivalents at End of the Period			5,789				—				5,789
Supplemental Disclosure of Cash Flow Information:
Restricted Cash			4,144				16,484				20,628
Short Term Investments			—				1,271				1,271
Borrower Loans at Fair Value			170,518				(3,142	)			167,376
Property and Equipment, net			721				(237	)			484
Accrued Liabilities			(820	)			689				(131	)
Payable to Investors			—				(18,096	)			(18,096	)
Notes at Fair Value			(170,573	)			2,815				(167,758	)
Non-Cash Transfer			3,990				(216	)			3,774
Cash Transferred			1,875				—				1,875
Total Transfer of Net Non-Cash Assets from PMI			5,865				(213	)			5,649
Cash Paid for Interest			—				32,154				32,154
Non-Cash Financing Activity, Distribution to Parent			—				24				24

Quarterly_Financial_Informatio

Quarterly Financial Information (unaudited)	12 Months Ended
Quarterly Financial Information (unaudited)	Dec. 31, 2014
Quarterly Financial Information (unaudited)	16	Quarterly Financial Information (unaudited)
	Subsequent to the issuance of the condensed consolidated financial statements for the nine months ended September 30, 2014, the Company identified errors as described in Note 16 that affected the interim condensed financial statements as of and for all interim periods within the years ended December 31, 2014 and 2013. Accordingly, the previously issued condensed consolidated financial statements as and for the periods ended March 31, 2013, June 30, 2013, September 30, 2013, March 31, 2014, June 30, 2014 and September 30, 2014 are restated to correct for these errors that are described below and summarized in the tables that follow.
	Certain bank accounts were previously not recorded on the balance sheets. The use of the cash in these bank accounts is restricted and may only be used by the Company to fund “Borrower Loans, at Fair Value” on which investors have bid. The cash in these bank accounts should have been recognized as restricted cash on our Balance Sheet and a related payable to investors should also have been recognized. This resulted in an understatement of restricted cash and payable to investors.
	Additionally, the Company discovered that certain fees that the Company pays to WebBank were incorrectly classified as expenses. Since WebBank is a customer of the Company and the Company earns transaction fees from WebBank any cash consideration paid to WebBank should be recorded as a reduction of the transaction fees earned by the Company. This resulted in an overstatement of transaction fee revenues and origination and servicing expenses.
	The Company also discovered that certain rebates offered on the sale of loans and Notes were incorrectly classified as transaction fee revenue and should have been classified as other revenue or change in fair value of borrower loans, loans held for sale and notes. This resulted in an understatement of transaction fee revenues, an overstatement of other revenues and an overstatement of change in fair values of borrower loans, loans held for sale and notes.
	The Company also discovered that the Convertible Preferred Stock was incorrectly classified within permanent stockholders’ equity in its consolidated balance sheet for the interim periods described above. Since the Convertible Preferred Stockholders are entitled to receive their liquidation preference upon a change-in-control transaction the Convertible Preferred Stock should be classified as temporary equity. This resulted in a reclassification of the Convertible Preferred Stock from permanent equity to temporary equity of $19.9 million as of March 31, 2013 and June 30, 2013, $44.9 million as of September 30, 2013, December 31, 2013 and March 31, 2014, and $114.8 million as of June 30 2014. There was no impact as of September 30, 2014.
	Additionally, the Company discovered certain errors in its valuation of servicing assets and liabilities which resulted in an overstatement of net loan servicing rights and an understatement of the gain recognized on the sale of loans which was included in other revenues. Furthermore, the Company inappropriately classified loan servicing rights in “Borrower Loans Receivable at Fair Value”. The Company corrected this error by reclassifying the gross serving assets to “Prepaid and Other Assets and recognized the servicing liabilities in “Accounts Payable and Other Liabilities.
	The Company also discovered an error related to measurement of the Class Action Settlement Liability. Upon the courts preliminary approval of the settlement during the quarter ended December 31, 2013, this liability became payable at fixed future dates and therefore the Company should have recognized the liability based on the present value of the future payments rather than the gross amount of such future payments. This error resulted in an overstatement of the Class Action Settlement Liability and the Class Action Settlement expense recognized.
	Additionally, the Company also discovered a misclassification related to the presentation of interest receivable and payable. Previously these two amounts were incorrectly netted against each other. These amounts should have been recorded gross and as a result Borrower Loans and Notes resulting both to be understated.
	The Company also discovered that the fair value of the Borrower Loans and Notes were understated as a result of inappropriately aggregating certain loans when determining the fair value of Borrower Loans and Notes. This resulted in an understatement of the Borrower loans and the Notes.
	Additionally, the Company discovered that it had not recorded Notes issued on the correct date, resulting in an understatement of the Notes balance and an overstatement of investor payables.
	Additionally the Company discovered errors related to timing of when payments were applied to Note balances. This resulted in an overstatement of the Note balances and an understatement of the investor payable balance.
	The Company also discovered errors related to internal use software and web site development costs including than an impairment that was not recorded and assets were being amortized over a time period that exceeded their useful life which understated amortization. As a result property and equipment was overstated.
	In addition to the restatements described above, the Company has made other corrections, some of which were previously identified, but were not corrected because management had determined they were not material, individually or in the aggregate, to our consolidated financial statements. These corrections related to the fair value of loans held for investment, reclassification of certain loans from loans held for investment to Borrower Loans, amortization of prepaid assets, estimation of various accruals and a correction for vesting of options that were early exercised.
	Lastly, the Company discovered the following classification errors within its Condensed Consolidated Statement of Cash Flows:
	×	Changes in certain Restricted Cash balances related to investing activities were inappropriately classified as changes in cash flows from operating activities rather than changes in cash flows from investing activities.
	×	Cash flows from the principal payments and proceeds from sale related to Borrower Loans held for sale were inappropriately classified within cash flows from investing activities rather than cash flows from operating activities.
	×	A portion of the change in fair value of Borrower Loans and Notes was inappropriately reflected as a cash flow from investing and financing activities, respectively, rather than an adjustment to reconcile net income to net cash used in operating activities.
	×	The proceeds from sale of borrower loans held at fair value were netted against purchase of borrower loans at fair value.
	×	Other changes related to the correction of errors in the balance sheet and statement of operations as described above.

	The following tables present the impact of these corrections and corrections of other immaterial errors on the interim periods in the fiscal years ended December 31, 2014 and 2013 (in $ thousands, expect per share values and number of shares):

			As				Reclassifications		As				Adjustments				As Restated
			previously						reclassified
			reported
	For the three months ended September 30, 2014
	Total Revenues			—			*			—				—				—
	Operating Revenues			25,129			*			25,129				(920	)			24,209
	Cost of Revenues			—			*			—				—				—
	Net Revenues			26,043			*			26,043				(918	)			25,125
	Total Expenses			23,319			*			23,319				(1,538	)			21,781
	Other Income (Expenses), Net			—			*			—				—				—
	Net Income			2,724			*			2,724				620				3,344
	Basic and Diluted Earnings (Loss) per Share			(1.31	)		*			(1.31	)			0.07				(1.24	)
	Basic and Diluted Shares			9,280,334			*			9,280,334				—				9,280,334

	*The presentation of revenues for the three months ended September 30, 2014 represents the current presentation so no reclassification is needed.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended June 30, 2014
	Total Revenues			17,285				(17,285	)			—				—				—
	Operating Revenues			—				16,371				16,371				1,016				17,387
	Cost of Revenues			821				(821	)			—				—				—
	Net Revenues			16,464				913				17,377				916				18,293
	Total Expenses			16,559				823				17,382				197				17,579
	Other Income (Expenses), Net			92				(92	)			—				—				—
	Net Income			(3	)			(2	)			(5	)			719				714
	Basic and Diluted Earnings per Share			—				—				—				0.08				0.08
	Basic and Diluted Shares			9,155,199				—				9,155,199				—				9,155,199


			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended March 31, 2014
	Total Revenues			9,876				(9,876	)			—				—				—
	Operating Revenues			—				9,265				9,265				(36	)			9,229
	Cost of Revenues			587				(587	)			—				—				—
	Net Revenues			9,289				886				10,175				(196	)			9,979
	Total Expenses			11,754				587				12,341				356				12,697
	Other Income (Expenses), Net			299				(299	)			—				—				—
Net Loss			(2,166	)			—				(2,166	)			(552	)			(2,718	)
Basic and Diluted Earnings (Loss) per Share			(0.32	)			—				(0.32	)			(0.08	)			(0.40	)
Basic and Diluted Shares			6,868,153				—				6,868,153				—				6,868,153

		As		Reclassifications		As				Adjustments				As Restated
		previously				reclassified
		reported
For the three months ended December 31, 2013
Total Revenues		*		*			—				—				—
Operating Revenues		*		*			7,476				(199	)			7,277
Cost of Revenues		*		*			—				—				—
Net Revenues		*		*			8,460				(370	)			8,090
Total Expenses		*		*			10,824				(405	)			10,419
Other Income (Expenses), Net		*		*			—				—				—
Net Loss		*		*			(2,364	)			35				(2,329	)

*The three months ending December 31, 2013 were not previously presented as we are a smaller reporting company.

		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended September 30, 2013
Total Revenues			4,542				(4,542	)			—				—				—
Operating Revenues			—				4,405				4,405				111				4,516
Cost of Revenues			450				(450	)			—				—
Net Revenues			4,092				862				4,954				(185	)			4,769
Total Expenses			9,467				450				9,917				(236	)			9,681
Other Income (Expenses), Net			412				(412	)			—				—				—
Net Loss			(4,963	)			—				(4,963	)			51				(4,912	)
Basic and Diluted Earnings (Loss) per Share			(0.72	)			—				(0.72	)			0				(0.72	)
Basic and Diluted Shares			6,927,648				—				6,868,153				—				6,868,153


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended June 30, 2013
Total Revenues			3,405				(3,405	)			—				—				—
Operating Revenues			—				3,257				3,257				81				3,338
Cost of Revenues			550				(550	)			—				—				—
Net Revenues			2,855				1,133				3,988				(228	)			3,760
Total Expenses			19,030				611				19,641				(286	)			19,355
Other Income (Expenses), Net			522				(522	)			—				—				—
Net Loss			(15,653	)			—				(15,653	)			57				(15,596	)
Basic and Diluted Earnings (Loss) per Share			(2.39	)			(0	)			(2.39	)			0.01				(2.38	)
Basic and Diluted Shares			6,553,785				—				6,553,785				—				6,553,785


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended March 31, 2013
Total Revenues			1,703				(1,703	)			—				—				—
Operating Revenues			—				1,443				1,443				(48	)			1,395
Cost of Revenues			609				(609	)			—				—				—
Net Revenues			1,094				927				2,021				(259	)			1,762
Total Expenses			5,610				610				6,220				(288	)			5,932
Other Income (Expenses), Net			317				(317	)			—				—				—
Net Loss			(4,199	)			—				(4,199	)			29				(4,170	)
Basic and Diluted Earnings (Loss) per Share			(0.77	)			—				(0.77	)			0.01				(0.76	)
Basic and Diluted Shares			5,480,850				—				5,480,850				—				5,480,850

Prosper Funding LLC [Member]
Quarterly Financial Information (unaudited)	11	Quarterly Financial Information (unaudited)
	Subsequent to the issuance of the condensed consolidated financial statements for the nine months ended September 30, 2014, the Company identified errors as described in Note 16 that affected the interim condensed financial statements as of and for all interim periods within the years ended December 31, 2014 and 2013. Accordingly, the previously issued condensed consolidated financial statements as and for the periods ended March 31, 2013, June 30, 2013, September 30, 2013, March 31, 2014, June 30, 2014 and September 30, 2014 are restated to correct for these errors that are described below.
	Certain bank accounts were previously not recorded on the balance sheets. The use of the cash in these bank accounts is restricted and may only be used by the Company to fund Borrower Loans, at Fair Value on which investors have bid. The cash in these bank accounts should have been recognized as Restricted Cash on our Balance Sheet and a related Payable to Investors should also have been recognized. This resulted in an understatement of restricted cash and payable to investors.
	Additionally, the Company discovered certain errors in its valuation of servicing assets and liabilities which resulted in an overstatement of net loan servicing rights and an understatement of the gain recognized on the sale of loans which was included in other revenues. Furthermore, the Company inappropriately classified loan servicing rights in Borrower Loans Receivable at Fair Value. The Company corrected this error by reclassifying the gross serving assets to Prepaid and Other Assets and recognized the servicing liabilities in Accounts Payable and Other Liabilities.
	The Company also discovered that the Administration Fee Related Party Expense was overstated and the Related Party Receivable was understated due to an error in the calculation of the fee.
	Additionally, the Company also discovered a misclassification related to the presentation of interest receivable and payable. Previously these two amounts were incorrectly netted against each other. These amounts should have been recorded gross and as a result Borrower Loans and Notes resulting both to be understated.
	The Company also discovered that the fair value of the Borrower Loans and Notes were understated as a result of inappropriately aggregating certain loans when determining the fair value of Borrower Loans and Notes. This resulted in an understatement of the Borrower loans and the Notes.
	Additionally, the Company discovered that it had not recorded Notes issued on the correct date, resulting in an understatement of the Notes balance and an overstatement of investor payables.
	Additionally the Company discovered errors related to timing of when payments were applied to Note balances. This resulted in an overstatement of the Note balances and an understatement of the investor payable balance.
	The Company also discovered errors related to internal use software including an overstatement of assets transferred from PMI and assets were being amortized over a time period that exceeded their useful life which understated amortization. As a result Property and Equipment was overstated.
	In addition to the restatements described above, the Company has made other corrections, some of which were previously identified, but were not corrected because management had determined they were not material, individually or in the aggregate, to our consolidated financial statements. These corrections related to the fair value of loans held for investment, reclassification of certain loans from loans held for investment to Borrower Loans, and estimation of various accruals and a correction for vesting of options that were early exercised.
	Lastly, the Company discovered the following classification errors within its Condensed Consolidated Statement of Cash Flows:
	×	Changes in certain Restricted Cash balances related to investing activities were inappropriately classified as changes in cash flows from operating activities rather than changes in cash flows from investing activities.
	×	Cash flows from the principal payments and proceeds from sale related to Borrower Loans held for sale were inappropriately classified within cash flows from investing activities rather than cash flows from operating activities.
	×	A portion of the change in fair value of Borrower Loans and Notes was inappropriately reflected as a cash flow from investing and financing activities, respectively, rather than an adjustment to reconcile net income to net cash used in operating activities.
	Other changes related to the correction of errors in the balance sheet and statement of operations as described above.
	The following tables present the impact of these corrections and corrections of other immaterial errors on the interim periods in the fiscal years ended December 31, 2014 and 2013 (in thousands):

			As		Reclassifications		As				Adjustments				As Restated
			previously				reclassified
			reported
	For the three months ended September 30, 2014
	Total Revenues		*		*			—				—				—
	Operating Revenues		*		*			10,783				284				11,067
	Cost of Revenues		*		*			—				—				—
	Net Revenues		*		*			11,716				346				12,062
	Total Expenses		*		*			8,196				(388	)			7,808
	Other Income		*		*			—				—				—
	Net Income		*		*			3,520				734				4,254

	*The revised revenue presentation was implemented for the three months ended September 30, 2014.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended June 30, 2014
	Total Revenues			7,766				(7,766	)			—				—				—
	Operating Revenues			—				6,852				6,852				1,428				8,280
	Cost of Revenues			710				(710	)			—				—				—
	Net Revenues			7,056				802				7,858				1,430				9,288
	Total Expenses			4,564				710				5,274				702				5,976
	Other Income			92				(92	)			—				—				—
	Net Income			2,584				—				2,584				728				3,312


			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended March 31, 2014
	Total Revenues			5,197				(5,197	)			—				—				—
	Operating Revenues			—				4,579				4,579				196				4,775
	Cost of Revenues			459				(459	)			—				—				—
	Net Revenues			4,738				750				5,488				156				5,644
	Total Expenses			2,941				459				3,400				596				3,996
	Other Income			291				(291	)			—				—				—
	Net Income			2,088				—				2,088				(440	)			1,648


			As		Reclassifications		As				Adjustments				As Restated
			previously				reclassified
			reported
	For the three months ended December 31, 2013		*		*
	Total Revenues		*		*			—				—				—
	Operating Revenues		*		*			3,859				(50	)			3,809
Cost of Revenues		*		*			—				—				—
Net Revenues		*		*			4,797				(14	)			4,783
Total Expenses		*		*			3,118				24				3,142
Other Income		*		*			—				—				—
Net Income		*		*			1,679				(38	)			1,641

*This period was not previously presented.

		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended September 30, 2013
Total Revenues			2,646				(2,646	)			—				—				—
Operating Revenues			—				2,131				2,131				157				2,288
Cost of Revenues			291				(291	)			—				—				—
Net Revenues			2,355				324				2,679				97				2,776
Total Expenses			1,738				291				2,029				80				2,109
Other Income			33				(33	)			—				—				—
Net Income			650				—				650				17				667

		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended June 30, 2013
Total Revenues			1,978				(1,978	)			—				—				—
Operating Revenues			—				1,546				1,546				(14	)			1,532
Cost of Revenues			388				(388	)			—				—				—
Net Revenues			1,590				686				2,276				(3	)			2,273
Total Expenses			810				388				1,198				29				1,227
Other Income			298				(298	)			—				—				—
Net Income			1,078				—				1,078				(32	)			1,046


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended March 31, 2013
Total Revenues			861				(861	)			—				—				—
Operating Revenues			—				607				607				—				607
Cost of Revenues			324				(324	)			—				—				—
Net Revenues			537				499				1,036				67				1,103
Total Expenses			525				324				849				15				864
Other Income			175				(175	)			—				—				—
Net Income			187				—				187				52				239

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2014
Subsequent Events [Abstract]
Subsequent Events	17	Subsequent Events
	On January 23, 2015, the Company acquired American HealthCare Lending LLC for $21 million in cash. American HealthCare Lending LLC, a leading patient financing platform, gives its nationwide network of healthcare providers the ability to offer affordable payment options to consumers who would like to finance medical procedures at the point of service. This acquisition is an important part of our strategy to grow awareness and expand our product offerings and capabilities into new vertical markets. The initial accounting for this acquisition was not complete as of March 30, 2015.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)

12 Months Ended

Dec. 31, 2014

Significant Accounting Policies [Line Items]

Basis of Presentation

Use of Estimates

Certain Risks and Concentrations

Certain Risks

Reclassifications

Consolidation of Variable Interest Entities

Cash and Cash Equivalents

Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking accounts.

Restricted Cash

Fair Value Measurement

Under ASC Topic 820, assets and liabilities carried at fair value on the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value:

Level 1 — The valuation is based on quoted prices in active markets for identical instruments.

The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013 (in thousands):

31-Dec-14

Level 1

Level 2

Level 3

Fair Value

Inputs

Assets

Borrower Loans

—

273,243

Restricted Cash

76,783

4,517

—

81,300

Short Term Investments

—

1,274

—

1,274

Loans Held for Sale

—

8,463

Total Assets

76,783

5,791

281,706

364,280

Liabilities

Notes

—

273,783

31-Dec-13

Level 1

Level 2

Level 3

Fair Value

Inputs

Assets

Borrower Loans

—

233,105

Restricted Cash

49,904

170

50,074

Short Term Investments

—

1,271

—

1,271

Loans Held for Sale

—

3,206

Total Assets

49,904

1,441

236,311

287,656

Liabilities

Notes

—

234,218

Borrower Loans and Notes

Loan Servicing Assets and Liabilities

Loans Held for Sale

Property and Equipment

Furniture and fixtures

7 years

Office equipment

5 years

Computers and equipment

3 years

Leasehold improvements

5-8 years

Software and website development costs

1-3 years

Repurchase Liability for Unvested Restricted Stock Awards

Investors Payable

Payable to Investors

Payable to investors primarily represents our obligation to investors related to cash held in for the benefit account, payments-in-process received from investors.

Revenue Recognition

Transaction Fees

Servicing Fees

Interest Income on Borrower Loans, and Interest Expense on Notes

Advertising Costs

Stock-Based Compensation

Compensation expense for stock options issued to nonemployees is calculated using the Black-Scholes option pricing model and is recorded over the requisite service period.

Income Taxes

Income Taxes

Comprehensive Income

There is no comprehensive income (loss) other than the net income (loss) disclosed in the condensed consolidated statements of operations.

Recent Accounting Pronouncements

Short Term Investments

Prosper Funding LLC [Member]

Significant Accounting Policies [Line Items]

Basis of Presentation

Use of Estimates

Certain Risks and Concentrations

Certain Risks

Reclassifications

Consolidation of Variable Interest Entities

Cash and Cash Equivalents

Cash equivalents are recorded at cost, which approximates fair value. Such deposits periodically exceed amounts insured by the FDIC.

Restricted Cash

Fair Value Measurement

Under ASC Topic 820, assets and liabilities carried at fair value in the balance sheets are classified among three levels based on the observability of the inputs used to determine fair value:

Level 1 — The valuation is based on quoted prices in active markets for identical instruments.

The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013:

Level 1

Level 2

Level 3

31-Dec-14

Inputs

Fair Value

Assets

Borrower Loans

—

273,243

Restricted Cash

73,103

—

73,103

Short Term Investments

—

1,274

—

1,274

Loans Held for Sale

—

8,463

Total Assets

73,103

1,274

281,706

356,083

Liabilities

Notes

—

273,783

Level 1

Level 2

Level 3

31-Dec-13

Inputs

Fair Value

Assets

Restricted Cash

46,900

—

46,900

Short Term Investments

—

1,271

—

1,271

Borrower Loans

—

233,104

Loans Held for Sale

—

3,206

Total Assets

46,900

1,271

236,310

284,481

Liabilities

Notes

—

234,218

Borrower Loans and Notes

Loan Servicing Assets and Liabilities

The Company records servicing assets and liabilities at their estimated fair values if servicing rights are retained when the Company sells Borrower Loans to unrelated third-party buyers. The gain or loss on a loan sale is recorded in “Other Revenue” while the fair value of the servicing rights, which is based on the degree to which the contractual loan servicing fee is above or below an estimated market loan servicing fee is recorded in servicing assets or liabilities. Servicing assets and liabilities are recorded in “Prepaid and Other Assets” and “Accrued Expenses and Other Liabilities,” respectively, on the consolidated balance sheets. The initial fair value of servicing assets or liabilities are amortized in proportion to and over the period of estimated servicing income or loss and are reported in “Servicing Fees” on the consolidated statement of operations.

The Company uses a discounted cash flow model to estimate the fair value of the loan servicing assets or liabilities which considers the contractual projected servicing fee revenue that the Company earns on the loans, estimated market servicing fees to service such loans, prepayment rates, default rates and the current principal balances of the loans.

The Company periodically assesses servicing assets accounted for using the amortization method for impairment. For purposes of measuring impairment, the servicing assets are stratified based on predominant risk characteristics of the underlying serviced loans. These risk characteristics include loan type, interest rate and term. Impairment, if any, represents the excess of amortized cost of an individual stratum over its estimated fair value and is recognized in current period earnings and the carrying value of the assets is adjusted through a valuation allowance.

Loans Held for Sale

Investors Payable

Payable to Investors

Payable to investors primarily represents our obligation to investors related to cash held in the “for the benefit” or FBO account and payments-in-process received from investors.

Revenue Recognition

Administration Agreement License Fees

Service Fees

Investors in whole loans typically pay the Company a servicing fee which is currently generally set at 1% per annum of the outstanding principal balance of the corresponding loan prior to applying the current payment. The servicing fee compensates the Company for the costs we incur in servicing the related loan, including managing payments from borrowers, payments to investors and maintaining investors’ account portfolios. Prosper records servicing fees paid by borrower loan holders as a component of operating revenue when received. The amortization of servicing rights is also included in servicing fees.

Interest Income on Borrower Loans and Interest Expense on Notes

Comprehensive Income

There is no comprehensive income (loss) other than the net income (loss) disclosed in the condensed consolidated statements of operations.

Recent Accounting Pronouncements

Short Term Investments

Internal Use Software and Website Development

Costs incurred prior to meeting these criteria, together with costs incurred for training and maintenance, are expensed. Costs incurred for upgrades and enhancements that are considered to be probable to result in additional functionality are capitalized. Capitalized costs are included in property and equipment and amortized to expense using the straight-line method over their expected lives which is generally one to three years. PFL evaluates its software assets for impairment whenever events or changes in circumstances indicate that the carrying amount of such assets may not be recoverable. Recoverability of software and website development assets to be held and used is measured by a comparison of the carrying amount of the asset to the future net undiscounted cash flows expected to be generated by the asset. If such software and website development assets are considered to be impaired, the impairment to be recognized is the excess of the carrying amount over the fair value of the software and website development asset group.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
Summary of Significant Accounting Policies (Tables)	Dec. 31, 2014
Significant Accounting Policies [Line Items]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013 (in thousands):

	31-Dec-14	Level 1		Level 2		Level 3		Fair Value
	31-Dec-14	Inputs		Inputs		Inputs		Fair Value
	Assets
	Borrower Loans	$	—	$	—	$	273,243	$	273,243
	Restricted Cash		76,783		4,517		—		81,300
	Short Term Investments		—		1,274		—		1,274
	Loans Held for Sale		—		—		8,463		8,463
	Total Assets		76,783		5,791		281,706		364,280
	Liabilities
	Notes	$	—	$	—	$	273,783	$	273,783

	31-Dec-13	Level 1		Level 2		Level 3		Fair Value
	31-Dec-13	Inputs		Inputs		Inputs		Fair Value
	Assets
	Borrower Loans	$	—	$	—	$	233,105	$	233,105
	Restricted Cash		49,904		170				50,074
	Short Term Investments		—		1,271		—		1,271
	Loans Held for Sale		—		—		3,206		3,206
	Total Assets		49,904		1,441		236,311		287,656
	Liabilities
	Notes	$	—	$	—	$	234,218		234,218

Estimated Useful Lives of Assets	Estimated useful lives of the assets as follows:

	Furniture and fixtures	7 years
	Office equipment	5 years
	Computers and equipment	3 years
	Leasehold improvements	5-8 years
	Software and website development costs	1-3 years

Prosper Funding LLC [Member]
Significant Accounting Policies [Line Items]
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2014 and 2013:

		Level 1		Level 2		Level 3
	31-Dec-14	Inputs		Inputs		Inputs		Fair Value
	Assets
	Borrower Loans	$	—	$	—	$	273,243	$	273,243
	Restricted Cash		73,103		—		—		73,103
	Short Term Investments		—		1,274		—		1,274
	Loans Held for Sale		—		—		8,463		8,463
	Total Assets		73,103		1,274		281,706		356,083

	Liabilities
	Notes	$	—	$	—	$	273,783	$	273,783

		Level 1		Level 2		Level 3
	31-Dec-13	Inputs		Inputs		Inputs		Fair Value
	Assets
	Restricted Cash	$	46,900	$	—	$	—	$	46,900
	Short Term Investments		—		1,271		—		1,271
	Borrower Loans		—		—		233,104		233,104
	Loans Held for Sale		—		—		3,206		3,206
	Total Assets		46,900		1,271		236,310		284,481

	Liabilities
	Notes	$	—	$	—	$	234,218	$	234,218

Property_and_Equipment_Net_Tab

Property and Equipment, Net (Tables)	12 Months Ended
Property and Equipment, Net (Tables)	Dec. 31, 2014
Property and Equipment, Net	Property and equipment consist of the following (in thousand)s:

		December 31,
		2014			2013
	Property and equipment:
	Computer equipment	$	3,824		$	2,115
	Internal-use software and website development costs		4,486			3,592
	Office equipment and furniture		1,904			39
	Leasehold improvements		5,274			—
	Assets not yet placed in service		4,361			651
	Property and equipment		19,849			6,397
	Less accumulated depreciation and amortization		(5,425	)		(3,371	)
	Total property and equipment, net	$	14,424		$	3,026

Prosper Funding LLC [Member]
Property and Equipment, Net	Property and equipment consist of the following (in thousands) :

		December 31,
		2014			2013
	Property and equipment:
	Internal-use software and web site development costs	$	4,042		$	3,217
	Property and equipment		4,042			3,217
	Less accumulated depreciation and amortization		(2,917	)		(1,607	)
	Total property and equipment, net	$	1,125		$	1,610

Borrower_Loans_Loans_Held_for_1

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2014
Borrower Loans, Notes and Loans Held for Sale	At December 31, 2014 and December 31, 2013, Borrower Loans, Notes and Loans Held for Sale (in thousands) were:

		Borrower Loans								Notes						Loans Held for Sale
		December 31, 2014				December 31, 2013				December 31, 2014			December 31, 2013			December 31, 2014		December 31, 2013
	Aggregate principal balance	$	268,598			$	228,184			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	outstanding	$	268,598			$	228,184			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	Fair value adjustments		4,645				4,921				(1,514	)		(2,125	)		168		49
	Fair value	$	273,243			$	233,105			$	(273,783	)	$	(234,218	)	$	8,463	$	3,206

	At December 31, 2014 and December 31, 2013, borrower loans, notes and loans held for sale (in thousands) were:

		Borrower Loans								Notes						Loans Held for Sale
		31-Dec-14				31-Dec-13				31-Dec-14			31-Dec-13			31-Dec-14		31-Dec-13
	Aggregate principal balance	$	268,598			$	228,183			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	outstanding	$	268,598			$	228,183			$	(272,269	)	$	(232,093	)	$	8,295	$	3,157
	Fair value adjustments		4,645				4,921				(1,514	)		(2,125	)		168		49
	Fair value	$	273,243			$	233,104			$	(273,783	)	$	(234,218	)	$	8,463	$	3,206

Fair Value Assumptions for Loans Held for Sale, Borrower Loans and Notes	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2014 for Loans Held for Sale, Borrower Loans and Notes funded through the Note Channel are presented in the following table (in thousands):

		Borrower Loans / Loans Held for Sale				Notes
	Discount rate assumption:		5.25	%	*		5.25	%	*
	Resulting fair value increase/(decrease) from:
	100 basis point increase	$	278,212			$	270,672
	200 basis point increase		275,108				267,646
	Resulting fair value from:
	100 basis point decrease	$	284,683			$	276,983
	200 basis point decrease		288,059				280,274
	Default rate assumption:		12.06	%	*		12.06	%	*
	Resulting fair value from:
	Applying a 0.8 multiplier to default rate	$	288,507			$	280,696
	Applying a 0.9 multiplier to default rate		284,968				277,253
	Resulting fair value from:
	Applying a 1.1 multiplier to default rate	$	277,881			$	270,357
	Applying a 1.2 multiplier to default rate		274,443				267,012
	* Represents weighted average assumptions considering all credit grades.
Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis	The changes in Level 3 assets measured at fair value on a recurring basis are as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes				Loans Held			Total
		Loans				Notes				for Sale			Total
	Balance at January 1, 2013	$	163,861			$	(164,840	)		$	—		$	(979	)
	Purchase of Loans/Issuance of Notes		169,859				(170,586	)			184,807			184,080
	Principal repayments		(90,054	)			89,681				—			(373	)
	Borrower loans sold to third parties		—				—				(181,656	)		(181,656	)
	Change in fair value		(10,561	)			11,527				55			1,021
	Balance at December 31, 2013	$	233,105			$	(234,218	)		$	3,206		$	2,093

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes				Loans Held			Total
		Loans				Notes				for Sale			Total
	Balance at January 1, 2014	$	233,105			$	(234,218	)		$	3,206		$	2,093
	Purchase of Loans/Issuance of Notes		177,088				(176,865	)			1,416,809			1,417,032
	Principal repayments		(121,082	)			120,909				—			(173	)
	Borrower loans sold to third parties		—				—				(1,411,625	)		(1,411,625	)
	Change in fair value		(15,868	)			16,391				73			596
	Balance at December 31, 2014	$	273,243			$	(273,783	)		$	8,463		$	7,923

	The changes in Level 3 assets measured at fair value on a recurring basis are as follows (in thousands):

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
										Loans
										Held for
		Borrower Loans				Notes				Sale			Total
	Balance at January 1, 2013	$	—			$	—			$	—		$	—
	Assets transferred on February 1, 2013		167,376				(167,758	)			—			(382	)
	Originations		160,037				(160,764	)			184,807			184,080
	Principal repayments		(83,677	)			82,924				—			(753	)
	Borrower loans sold to third parties		—				—				(181,645	)		(181,645	)
	Change in fair value		(10,632	)			11,380				44			792
	Balance at December 31, 2013	$	233,104			$	(234,218	)		$	3,206		$	2,092

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
										Loans
										Held for
		Borrower Loans				Notes				Sale			Total
	Balance at January 1, 2014	$	233,104			$	(234,218	)		$	3,206		$	2,092
	Originations		177,088				(176,865	)			1,416,809			1,417,032
	Principal repayments		(121,081	)			120,909				—			(172	)
	Borrower loans sold to third parties		—				—				(1,411,625	)		(1,411,625	)
	Change in fair value		(15,868	)			16,391				73			596
	Balance at December 31, 2014	$	273,243			$	(273,783	)		$	8,463		$	7,923

Prosper Funding LLC [Member]
Fair Value Assumptions for Loans Held for Sale, Borrower Loans and Notes	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2014 for Borrower Loans and Notes funded through the Note Channel are presented in the following table (in thousands):

		Borrower				Notes
		Loans				Notes
	Discount rate assumption:		5.25	%	*		5.25	%	*
	Resulting fair value from:
	100 basis point increase	$	278,212			$	270,672
	200 basis point increase		275,108				267,646
	Resulting fair value from:
	100 basis point decrease	$	284,683			$	276,983
	200 basis point decrease		288,059				280,274
	Default rate assumption:		12.06	%	*		12.06	%	*
	Resulting fair value from:
	Applying a 0.8 multiplier to default rate	$	288,507			$	280,696
	Applying a 0.9 multiplier to default rate		284,968				277,253
	Resulting fair value from:
	Applying a 1.1 multiplier to default rate	$	277,881			$	270,357
	Applying a 1.2 multiplier to default rate		274,443				267,012
	* Represents weighted average assumptions considering all credit grades.

Loan_Servicing_Assets_and_Liab1

Loan Servicing Assets and Liabilities (Tables)	12 Months Ended
Loan Servicing Assets and Liabilities (Tables)	Dec. 31, 2014
Significant Unobservable Inputs	The following table presents quantitative information about the significant unobservable inputs used for our servicing asset/liability fair value measurements at December 31, 2014 and December 31, 2013:

		Range
	Unobservable Input	December 31, 2014		December 31, 2013
	Discount rate	15% - 25%		15% - 25%
	Default rate	2.62% - 26.32%		1.73% - 19.75%
	Market servicing rate	0.625% -0.70%		0.70%

Schedule of Servicing Assets and Liabilities at Amortized Value	The following tables present additional information about Level 3 servicing assets and liabilities being amortized for the year ended December 31, 2014 and 2013 (in thousands).

		Servicing			Servicing
		Assets			Liabilities
	Amortized cost at January 1, 2013	$	—		$	—
	Additions		496			177
	Less: Amortization		(36	)		(10	)
	Amortized cost at December 31, 2013	$	460		$	167
	Additions		4,700			662
	Less: Amortization		(997	)		(205	)
	Amortized cost at December 31, 2014	$	4,163		$	624
	Fair Value at December 31, 2014	$	4,708		$	595

Schedule of Estimated Fair Value of Servicing Assets and Liabilities	The table below shows the estimated impact on our estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of December 31, 2014 (in thousands, except percentages).

		Servicing			Servicing
		Assets			Liabilities
	Weighted average market servicing rate assumptions		0.625	%		0.625	%
	Increase (decrease) in fair value
	Market servicing rate increase to 0.65%	$	(348	)	$	59
	Market servicing rate decrease to 0.60%	$	348		$	(59	)
	Weighted average default assumptions		13	%		13	%
	Increase (decrease) in fair value
	Applying a 1.1 multiplier to default rate	$	(88	)	$	1
	Applying a 0.9 multiplier to default rate	$	89		$	(1	)

Prosper Funding LLC [Member]
Significant Unobservable Inputs	The following table presents quantitative information about the significant unobservable inputs used for our servicing asset/liability fair value measurements at December 31, 2014 and December 31, 2013:

		Range
	Unobservable Input	31-Dec-14		31-Dec-13
	Discount rate	15% - 25%		15% - 25%
	Default rate	2.62% - 26.32%		1.73% - 19.75%
	Market servicing rate	0.625% -0.70%		0.70%

Schedule of Servicing Assets and Liabilities at Amortized Value	The following tables present additional information about Level 3 servicing assets and liabilities being amortized for the years ended December 31, 2014 and 2013 (in thousands).

		Servicing			Servicing
		Assets			Liabilities
	Amortized cost at January 1, 2013	$	—		$	—
	Additions		496			177
	Less: Transfers to PMI		(24	)
	Less: Amortization		(36	)		(10	)
	Amortized cost at December 31, 2013	$	436		$	167
	Additions		4,700			662
	Less: Transfers to PMI		(1,221	)
	Less: Amortization		(799	)		(205	)
	Amortized cost at December 31, 2014	$	3,116		$	624
	Fair Value at December 31, 2014	$	3,515		$	595

Schedule of Estimated Fair Value of Servicing Assets and Liabilities	The table below shows the estimated impact on our estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of December 31, 2014 (in thousands, except percentages).

		Servicing			Servicing
		Assets			Liabilities
	Weighted average market servicing rate assumptions		0.625	%		0.625	%
	Increase (decrease) in fair value
	Servicing rate increase to 0.65%	$	(260	)	$	59
	Servicing rate decrease to 0.60%	$	260		$	(59	)
	Weighted average default assumptions		10	%		10	%
	Increase (decrease) in fair value
	Applying a 1.1 multiplier to default rate	$	(66	)	$	1
	Applying a 0.9 multiplier to default rate	$	66		$	(1	)

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2014
Earnings Per Share [Abstract]
Basic and Diluted Loss Per Share	Basic and diluted net loss per share was calculated as follows (net loss in thousands):

		Year Ended December 31,
		2014			2013
	Numerator:
	Net loss available to common stockholders for basic and	$	(17,561	)	$	(27,007	)
	diluted EPS
	Denominator:
	Weighted average shares used in computing basic and		8,896,801			6,596,827
	diluted net loss per share
	Basic and diluted net loss per share	$	(1.97	)	$	(4.09	)

Dilutive Shares Excluded from the Diluted Net Loss Per Share Calculation	Due to losses attributable to Prosper’s common shareholders for each of the periods below, the following potentially dilutive shares are excluded from the diluted net loss per share calculation because they were anti-dilutive under the treasury stock method, in accordance with ASC Topic 260:

		Year Ended December 31,
		2014			2013
		(shares)			(shares)
	Excluded securities:
	Convertible preferred stock issued and outstanding		30,699,957			27,274,068
	Stock options issued and outstanding		4,994,998			894,976
	Unvested stock options exercised		4,114,269			5,594,134
	Warrants issued and outstanding		176,887			218,810
	Total common stock equivalents excluded from diluted		39,986,111			33,981,988
	net loss per common share computation

Convertible_Preferred_Stock_an1

Convertible Preferred Stock and Stockholders' Equity (Deficit) (Tables)	12 Months Ended
	Dec. 31, 2014
Stockholders Equity Note [Abstract]
Summary of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock	The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of December 31, 2014 are disclosed in the table below:

	Convertible Preferred Stock	Par Value		Authorized		Outstanding and Issued		Liquidation
				shares as of		shares as of		Preference
				December 31,		December 31,		($,000s)
				2014		2014
	New Series A	$	0.01		13,868,152		13,711,644	$	19,774
	Series A-1		0.01		5,117,182		4,952,183		49,522
	New Series B		0.01		8,288,734		7,155,176		21,581
	New Series C		0.01		4,880,954		4,880,954		70,075
					32,155,022		30,699,957	$	160,952

Stock_Option_Plan_and_Compensa1

Stock Option Plan and Compensation (Tables)	12 Months Ended
Stock Option Plan and Compensation (Tables)	Dec. 31, 2014
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Activity of Options that were Early Exercised under the Plan	The activity of options that were early exercised under the 2005 Plan follow for the years below:

			Early exercised			Weighted average			Weighted Average			Aggregate
			options, unvested			exercise price			Contractual Term			Intrinsic Value
									(in years)			(in thousands)
	Balance as of January 1, 2013			—		$	—
	Exercise of non-vested stock options			6,499,463			0.11
	Repurchase of restricted stock			(414,130	)		0.21
	Restricted stock vested			(491,199	)		0.1
	Balance as of December 31, 2013			5,594,134			0.12
	Exercise of non-vested stock options			865,717			0.94
	Repurchase of restricted stock			(181,893	)		0.1
	Restricted stock vested			(2,165,689	)		0.16
	Balance as of December 31, 2014			4,112,269			0.25			2.23		$	74,473
	Options expected to vest			3,674,592		$	0.25			2.23		$	66,547

Additional Information Regarding the Unvested Early Exercised Stock Options Outstanding	Additional information regarding the unvested early exercised stock options outstanding as of December 31, 2014 is as follows:

			Options Outstanding
	Range of		Number			Weighted –Avg.			Weighted –Avg.
	Exercise		Outstanding			Remaining Life			Exercise Price
	Prices
	$0.10 - $0.10			3,520,635			2.14		$	0.1
	0.57 - 0.57			528,495			2.64			0.57
	5.65-5.65			63,139			2.59			5.65
	$0.10 - $5.65			4,112,269			2.23		$	0.25

Summarized Option Activity under Option Plan	Option activity under the 2005 Plan is summarized as follows for the years below:

			Options			Weighted-			Weighted Average			Aggregate
			Issued and			Average			Contractual Term			Intrinsic Value
			Outstanding			Exercise			(in years)			(in thousands)
						Price
	Balance as of January 1, 2013			1,173,816		$	2.03
	Options granted			7,912,933			0.1
	Options exercised – vested			(828,496	)		0.26
	Options exercised – nonvested			(6,499,463	)		0.1
	Options forefeited			(863,814	)		1.17
	Balance as of December 31, 2013			894,976		$	1.46
	Options granted			5,287,763			1.76
	Options exercised – vested			(59,150	)		1.3
	Options exercised – nonvested			(865,717	)		0.94
	Options forefeited			(262,874	)		1.79
	Balance as of December 31, 2014			4,994,998		$	1.85			8.92		$	81,219
	Options vested and expected to vest as of December 31,			4,463,370			1.85			8.92		$	72,574
	2014			4,463,370			1.85			8.92		$	72,574
	Options vested and exercisable at December 31, 2014			3,921,049		$	1.32			8.75		$	65,834

Additional Information Regarding Common Stock Options Outstanding	Additional information regarding common stock options outstanding as of December 31, 2014 is as follows:

				Options Outstanding									Options Vested and Exercisable
							Weighted –			Weighted –					Weighted -
	Range of						Avg.			Avg.					Avg.
	Exercise			Number			Remaining			Exercise			Number		Exercise
	Prices			Outstanding			Life			Price			Vested		Price
	$	0.10 - $0.10			163,883			8.62		$	0.1			70,784	$	0.1
		0.57 - 0.57			3,170,301			9.12			0.57			1,983,728		0.57
		1.20 - 1.20			133,334			6.71			1.2			121,874		1.2
		1.70 - 1.70			77,552			7.37			1.7			62,724		1.7
		2.00 - 2.00			287,933			5.56			2			287,869		2
		5.00 - 5.00			7,000			1.75			5			7,000		5
		5.60 - 5.60			18,250			4.71			5.6			18,250		5.6
		5.65 - 5.65			1,136,745			9.71			5.65			737		5.65
	$	0.10 - $5.65			4,994,998			8.92		$	1.85			2,552,966	$	0.83

Fair Value of Stock Option Awards	The fair value of the Company’s stock option awards for the year ended December 31, 2014 and 2013 was estimated at the date of grant using the Black-Scholes model with the following average assumptions:

			Year ended
			December 31,
			2014			2013
	Volatility of common stock			68.28	%		75.34	%
	Risk-free interest rate			1.79	%		1.78	%
	Expected life		5.7 years			5.8 years
	Dividend yield			0	%		0	%

Stock Based Compensation Included in Consolidated Statements of Operations	The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in the Company’s consolidated statements of operations during the periods presented (in thousands):

			December 31,
			2014			2013
	Origination and Servicing		$	104		$	16
	Sales and Marketing			767			24
	General and Administrative			1,140			206
	Total stock based compensation		$	2,011		$	246

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
Income Taxes (Tables)	Dec. 31, 2014
Income Tax Disclosure [Abstract]
Effective Income Tax Reconciliation	The Company did not have any current or deferred federal or state income tax expense for the years ended December 31, 2014 and 2013. The income tax expense (benefit) differed from the amount computed by applying the U.S. federal income tax rate of 34% to pretax loss as a result of the following:

		Year Ended December 31,
		2014			2013
	Federal tax at statutory rate		34	%		34	%
	State tax at statutory rate (net of federal benefit)		1	%		2	%
	Permanent items		31	%		0	%
	Stock compensation		(9	)%		0	%
	Change in valuation allowance		(66	)%		(38	)%
	Credits and Reserves		9	%		(—	)%
	Other		0	%		2	%
			0	%		0	%

Deferred Tax Assets and Liabilities	Temporary items that give rise to significant portions of deferred tax assets and liabilities (tax-effected) at December 31, 2014 and 2013 are as follows (in thousands):

		December 31,
		2014			2013
	Net operating loss carry forwards	$	24,565		$	24,626
	Research & other credits		420			277
	Fixed assets		45			95
	Settlement liability		2,964			3,654
	Stock compensation		344			69
	Accrued liabilities and other		2,320			247
			30,658			28,968
	Fair value of loans		(1,160	)		(1,078	)
	Valuation allowance		(29,498	)		(27,890	)
	Net deferred tax asset	$	—		$	—

Unrecognized Tax Benefits	The following table summarizes the Company’s activity related to its unrecognized tax benefits (in thousands):

		December 31,			December 31,
		2014			2013
	Balance at January 1,	$	54,571		$	219
	Increase related to current year tax position	—			—
	Increase related to tax position of prior years	—				54,352
	Balance at December 31,	$	54,571		$	54,571

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
Commitments and Contingencies (Tables)	Dec. 31, 2014
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments	During the period the Company signed new leases for the new corporate headquarters at 221 Main Street in San Francisco California and for the co-location facility. These are non-cancelable operating leases that expire in February 2023 and August 2015, respectively. The Company also signed a new lease for office space in Phoenix Arizona under an operating lease that expires in June 2022.
	Future minimum rental payments under these leases as of December 31, 2014 are as follows (in thousands $) :

	2015		2,425
	2016		3,755
	2017		3,866
	2018		3,977
	2019		4,093
	Thereafter		13,091
	Total future operating lease obligations	$	31,207

Related_Parties_Tables

Related Parties (Tables)	12 Months Ended
Related Parties (Tables)	Dec. 31, 2014
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper as of December 31, 2014 and 2013 are summarized below (in thousands):

		Aggregate Amount of				Interest Earned on
	Related Party	Notes Purchased				Notes
		2014		2013		2014		2013
	Executive officers and management	$	1,127	$	1,096	$	163	$	12
	Directors		42		727		10		52
	Total	$	1,169	$	1,823	$	173	$	64


	Related Party	Notes balance as of December 31,
		2014		2013
	Executive officers and management	$	1,614	$	1,067
	Directors		76		322
		$	1,690	$	1,389

Prosper Funding LLC [Member]
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be affiliates and related parties of Prosper as of December 31, 2014 and 2013 are summarized below (in thousands):

		Aggregate Amount of
		Notes and Borrower				Interest Earned on
		Loans				Notes and Borrower
	Related Party	Purchased				Loans
		2014		2013		2014		2013
	Executive officers and management	$	1,127	$	1,170	$	159	$	1
	Directors		—		—		—		—
	Total	$	1,127	$	1,170	$	159	$	1


	Related Party	Loan balance as of December 31,
		2014		2013
	Executive officers and management	$	1,614	$	1,065
	Directors		—		—
	Total	$	1,614	$	1,065

Prior_Period_Adjustments_Table

Prior Period Adjustments (Tables)	12 Months Ended
Prior Period Adjustments (Tables)	Dec. 31, 2014
Condensed Financial Statements Captions [Line Items]
Restatement of Consolidated Balance Sheets, Consolidated Statements of Operations and Consolidated Statements of Cash Flows	The following tables present the impact of these corrections on the 2013 consolidated financial statements (in thousands, expect per share values):
	Consolidated Balance Sheet - December 31, 2013

			As previously								As
			reported				Reclassifications				reclassified				Adjustments				As Restated
	ASSETS
	Cash and Cash Equivalents		$	18,339			$	—			$	18,339			$	—			$	18,339
	Restricted Cash			15,473				—				15,473				34,351				49,824
	Short Term Investments			—				—				—				1,271				1,271
	Accounts Receivable			218				—				218				78				296
	Loans Held for Sale, at Fair Value			3,917				—				3,917				(711	)			3,206
	Borrower Loans, at Fair Value			226,238				—				226,238				6,867				233,105
	Property and Equipment, Net			3,396				—				3,396				(370	)			3,026
	Prepaid and Other Assets			708				—				708				484				1,192
	Total Assets			268,289				—				268,289				41,970				310,259
	LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS'
	EQUITY (DEFICIT)
	Accounts Payable and Accrued Liabilities			6,737				(3,690	)			3,047				341				3,388
	Payable to Investors			—				2,480				2,480				35,545				38,025
	Class Action Settlement Liability			10,000				—				10,000				(261	)			9,739
	Notes, at Fair Value			226,794				1,242				228,036				6,182				234,218
	Repurchase and Indemnification Obligation			32				(32	)			—				—				—
	Repurchase Liability for Unvested Restricted Stock Awards			609				—				609				(50	)			559
	Total Liabilities			244,172				—				244,172				41,757				285,929

	Convertible Preferred Stock			—				—				—				44,822				44,822

	Stockholders' Equity (Deficit)
	Convertible Preferred Stock			273				—				273				(273	)			—
	Common Stock			75				—				75				—				75
	Additional Paid-In Capital			128,140				—				128,140				(44,464	)			83,676
	Less: Treasury Stock			(291	)			—				(291	)			—				(291	)
	Accumulated Deficit			(104,080	)			—				(104,080	)			128				(103,952	)
	Total Stockholders' Equity (Deficit)			24,117				—				24,117				(44,609	)			(20,492	)
	Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		$	268,289			$	—			$	268,289			$	41,970			$	310,259

	Consolidated Statement of Operations – Year ended December 31, 2013

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	Revenues
	Operating Revenues
	Transaction Fees, Net		$	16,471			$	(1,094	)		$	15,377			$	(47	)		$	15,330
	Rebates and promotions			(1,534	)			1,534				—				—				—
	Servicing Fees, Net			—				(69	)			(69	)			328				259
	Other Revenues			—				1,274				1,274				(337	)			937
	Total Operating Revenues			14,937				1,645				16,582				(56	)			16,526
	Interest Income
	Interest Income on Borrower Loans			35,526				(609	)			34,917				78				34,995
	Interest Expense on Notes			(33,072	)			118				(32,954	)			(367	)			(33,321	)
	Net Interest Income			2,454				(491	)			1,963				(289	)			1,674
	Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net			877				—				877				(696	)			181
	Total Net Revenues			18,268				1,154				19,422				(1,041	)			18,381
	Cost of Revenues
	Cost of Services			(2,056	)			2,056				—				—				—
	Provision for repurchase and indemnification obligation			(118	)			118				—				—				—
				(2,174	)			2,174				—				—				—
	Expenses																			—
	Compensation and benefits			13,079				(13,079	)			—				—				—
	Marketing and advertising			14,851				(14,851	)			—				—				—
	Depreciation and amortization			961				(961	)			—				—				—
	Professional services			1,979				(1,979	)			—				—				—
	Facilities and maintenance			1,764				(1,764	)			—				—				—
Class action settlement			10,000				(10,000	)			—				—				—
Loss on impairment			62				(62	)			—				—				—
Other			1,733				(1,733	)			—				—				—
Origination and Servicing			—				7,465				7,465				(1,081	)			6,384
Sales and Marketing			—				16,740				16,740				(9	)			16,731
General and Administrative			—				22,398				22,398				(125	)			22,273
Total Expenses			44,429				2,174				46,603				(1,215	)			45,388
Interest income			3				(3	)			—				—				—
Other income			1,151				(1,151	)			—				—				—
Net Loss		$	(27,181	)		$	—			$	(27,181	)		$	174			$	(27,007	)

Consolidated Statement of Cash Flows – Year ended December 31, 2013

		As previously
		reported				Adjustments				As Restated
Cash Flows from Operating Activities:
Net Loss		$	(27,181	)		$	174			$	(27,007	)
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans Receivable			4,856				5,705				10,561
Change in Fair Value of Loans Held For Sale			1				(56	)			(55	)
Change in Fair Value of Notes			(5,734	)			(5,793	)			(11,527	)
Depreciation and Amortization			961				133				1,094
Change in Servicing Rights			—				(329	)			(329	)
Stock-Based Compensation Expense			229				17				246
Loss on Impairment of Property and Equipment			62				237				299
Class Action Settlement Liability			10,000				(261	)			9,739
Purchases of loans held sale			—				(184,807	)			(184,807	)
Proceeds from the sale of loans held for sale			—				181,656				181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities			(9,524	)			(11,681	)			(21,205	)
Accounts Receivable			(126	)			(130	)			(256	)
Prepaid and Other Assets			(332	)			12				(320	)
Accounts Payable and Accrued Liabilities			1,962				(2,731	)			(769	)
Payable to Investors			—				21,028				21,028
Net cash used in Operating Activities			(24,826	)			3,174				(21,652	)
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value			(341,176	)			171,317				(169,859	)
Principal Payments of Borrower Loans Held at Fair Value			105,692				(15,638	)			90,054
Proceeds from Sale of Borrower Loans Held at Fair Value			171,290				(171,290	)			—
Purchases of Property and Equipment			(2,889	)			175				(2,714	)
Maturities of Short Term Investments			1,000				1,619				2,619
Purchases of Short Term Investments			—				(1,271	)			(1,271	)
Repayment of Loans Held for Investment at Fair Value			143				(143	)			—
Origination of Loans Held for Investment at Fair Value			(14,296	)			14,296				—
Proceeds from sale of Borrower Loans at Fair Value			10,410				(10,410	)			—
Changes in Restricted Cash Related to Investing Activities			—				(7,685	)			(7,685	)
Net Cash Used in Investing Activities			(69,826	)			(19,030	)			(88,856	)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value			169,742				844				170,586
Payment of Notes Held at Fair Value			(104,692	)			15,011				(89,681	)
Proceeds from Issuance of Convertible Preferred Stock, Net			44,822				—				44,822
Proceeds from Early Exercise of Stock Options			650				44				694
Repurchase of Restricted Stock			(41	)			(45	)			(86	)
Proceeds from Exercise of Vested Stock Options			210				2				212
Net Cash Provided by Financing Activities			110,691				15,856				126,547
Net Increase (Decrease) in Cash and Cash Equivalents			16,039				—				16,039
Cash and Cash Equivalents at Beginning of the Year			2,300				—				2,300
Cash and Cash Equivalents at end of the year		$	18,339							$	18,339
Cash Paid for Interest		$	—			$	35,027			$	35,027
Non-Cash Investing Activity- Accrual for Property and Equipment, Net		$	—			$	175			$	175

Prosper Funding LLC [Member]
Condensed Financial Statements Captions [Line Items]
Restatement of Consolidated Balance Sheets, Consolidated Statements of Operations and Consolidated Statements of Cash Flows	The following tables present the impact of these corrections on the 2013 consolidated financial statements (in thousands, expect per share values):
	Condensed Consolidated Balance Sheet - December 31, 2013

			As previously								As
			reported				Reclassifications				Reclassified				Adjustments				As restated
	Assets
	Cash and Cash Equivalents		$	5,789			$	—			$	5,789			$	—			$	5,789
	Restricted Cash			12,299				—				12,299				34,351				46,650
	Short Term Investments			—				—				—				1,271				1,271
	Loans Held for Sale, at Fair Value			3,917				—				3,917				(711	)			3,206
	Borrower Loans Receivable, at Fair Value			226,238				—				226,238				6,866				233,104
	Property and Equipment, Net			1,980				—				1,980				(370	)			1,610
	Other Assets			14				—				14				429				443
	Total Assets			250,237				—				250,237				41,836				292,073
	Liabilities and Member's Equity
	Accounts Payable and Accrued Liabilities			3,712				(3,690	)			22				383				405
	Payable to Investors			—				2,480				2,480				35,541				38,021
	Notes, at Fair Value			226,794				1,242				228,036				6,182				234,218
	Repurchase and Indemnification Obligation			32				(32	)			—				—				—
	Related Party Payable			205				—				205				—				205
	Total Liabilities			230,743				—				230,743				42,106				272,849
	Member's Equity
	Member's Equity			16,076				—				16,076				(240	)			15,836
	Retained Earnings (Accumulated Deficit)			3,418				—				3,418				(30	)			3,388
	Total Member's Equity			19,494				—				19,494				(270	)			19,224
	Total Liabilities and Member's Equity		$	250,237			$	—			$	250,237			$	41,836			$	292,073

	Consolidated Statement of Operations – Year ended December 31, 2013

			As				Reclassifications				As				Adjustments				As restated
			previously								reclassified
			reported
	Revenues
	Operating Revenues
	Administration Fee Revenue – Related Party		$	7,632			$	—			$	7,632			$	—			$	7,632
	Servicing Income, Net			—				397				397				(25	)			372
	Other Revenues			—				28				28				205				233
	Total Operating Revenues			7,632				425				8,057				180				8,237
	Interest Income on Borrower Loans			32,862				(397	)			32,465				140				32,605
	Interest Expense on Notes			(30,564	)			—				(30,564	)			(192	)			(30,756	)
	Net Interest Income			2,298				(397	)			1,901				(52	)			1,849
	Change in Fair Value on Borrower Loans, Loans Held for Sale and Notes, net			877				—				877				(28	)			849
	Total Net Revenues			10,807				(397	)			10,835				100				10,935
	Cost of Revenues
	Cost of Services			(1,270	)			1,270				—				—				—
	Provision for repurchase and indemnification obligation			(83	)			83				—				—				—
				(1,353	)			1,353				—				—				—
	Expenses															—				—
	Servicing			—				1,891				1,891				131				2,022
	Administration Fee – Related Party			5,053								5,053				—				5,053
	Depreciation and Amortization			538				(538	)			—				—				—
	Professional Services			26				(26	)			—				—				—
	Other Operating Expenses			242				(242	)			—				—				—
	General and Administration			—				268				268				(1	)			267
	Total Expenses			5,859				1,353				7,212				130				7,342

	Other income			28				(28	)			—				—				—
	Total Net Income		$	3,623			$	—			$	3,623			$	(30	)		$	3,593

	Condensed Consolidated Statements of Cash Flows – Year ended December 31, 2013

			As previously
			reported				Adjustments				As restated
	Cash flows from operating activities:
Net Income		$	3,623			$	(30	)		$	3,593
Adjustments to Reconcile Net Income (Loss) to Net Cash Used in Operating Activities:
Change in Fair Value of Notes			(5,734	)			(5,646	)			(11,380	)
Change in Fair Value of Borrower Loans Receivable			4,856				5,776				10,632
Change in Fair Value of Loans Held for Sale			1				(45	)			(44	)
Depreciation and Amortization			538				133				671
Change in Servicing Rights			—				(292	)			(292	)
Purchase of loans held for at fair value			—				(184,807	)			(184,807	)
Proceeds from sales of Loans Held for Sale at fair value			—				181,645				181,645
Changes in Operating Assets and Liabilities:
Restricted Cash			(8,155	)			(9,291	)			(17,446	)
Other Assets			(13	)			5				(8	)
Accounts Payable and Accrued Liabilities			2,924				(2,817	)			107
Payable to Investors			—				19,925				19,925
Net Related Party Payable			205				—				205
Net Cash Used in Operating Activities			(1,755	)			4,556				2,801
Cash Flows From Investing Activities:
Purchase of Borrower Loans Receivable Held at Fair Value			(331,353	)			171,316				(160,037	)
Principle Payment of Borrower Loans Receivable Held at Fair Value			99,313				(99,313	)			—
Proceeds from Sale of Borrower Loans Receivable Held at Fair Value			171,290				(87,613	)			83,677
Repayment of Loans Held for Investment at Fair Value			143				(143	)			—
Origination of Loans Held for Investment at Fair Value			(14,296	)			14,296				—
Proceeds from sale of Borrower Loans at Fair Value			10,410				(10,410	)			—
Purchases of Property and Equipment			(1,798	)			1				(1,797	)
Changes in Restricted Cash Related to Investing Activities			—				(8,576	)			(8,576	)
Net Cash Used in Investing Activities			(66,291	)			(20,442	)			(86,733	)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value			159,921				843				160,764
Payment of Notes Held at Fair Value			(97,967	)			15,043				(82,924	)
Cash infusion from parent			10,001				—				10,001
Net Cash Included in Transfer of Assets from Parent			1,875				—				1,875
Net Cash Provided by Financing Activities			73,830				15,886				89,716
Net Increase in Cash and Cash Equivalents			5,784				—				5,784
Cash and Cash Equivalents at Beginning of the Period			5				—				5
Cash and Cash Equivalents at End of the Period			5,789				—				5,789
Supplemental Disclosure of Cash Flow Information:
Restricted Cash			4,144				16,484				20,628
Short Term Investments			—				1,271				1,271
Borrower Loans at Fair Value			170,518				(3,142	)			167,376
Property and Equipment, net			721				(237	)			484
Accrued Liabilities			(820	)			689				(131	)
Payable to Investors			—				(18,096	)			(18,096	)
Notes at Fair Value			(170,573	)			2,815				(167,758	)
Non-Cash Transfer			3,990				(216	)			3,774
Cash Transferred			1,875				—				1,875
Total Transfer of Net Non-Cash Assets from PMI			5,865				(213	)			5,649
Cash Paid for Interest			—				32,154				32,154
Non-Cash Financing Activity, Distribution to Parent			—				24				24

Quarterly_Financial_Informatio1

Quarterly Financial Information (unaudited) (Tables)	12 Months Ended
Quarterly Financial Information (unaudited) (Tables)	Dec. 31, 2014
Schedule of Quarterly Financial Information	The following tables present the impact of these corrections and corrections of other immaterial errors on the interim periods in the fiscal years ended December 31, 2014 and 2013 (in $ thousands, expect per share values and number of shares):

			As				Reclassifications		As				Adjustments				As Restated
			previously						reclassified
			reported
	For the three months ended September 30, 2014
	Total Revenues			—			*			—				—				—
	Operating Revenues			25,129			*			25,129				(920	)			24,209
	Cost of Revenues			—			*			—				—				—
	Net Revenues			26,043			*			26,043				(918	)			25,125
	Total Expenses			23,319			*			23,319				(1,538	)			21,781
	Other Income (Expenses), Net			—			*			—				—				—
	Net Income			2,724			*			2,724				620				3,344
	Basic and Diluted Earnings (Loss) per Share			(1.31	)		*			(1.31	)			0.07				(1.24	)
	Basic and Diluted Shares			9,280,334			*			9,280,334				—				9,280,334

	*The presentation of revenues for the three months ended September 30, 2014 represents the current presentation so no reclassification is needed.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended June 30, 2014
	Total Revenues			17,285				(17,285	)			—				—				—
	Operating Revenues			—				16,371				16,371				1,016				17,387
	Cost of Revenues			821				(821	)			—				—				—
	Net Revenues			16,464				913				17,377				916				18,293
	Total Expenses			16,559				823				17,382				197				17,579
	Other Income (Expenses), Net			92				(92	)			—				—				—
	Net Income			(3	)			(2	)			(5	)			719				714
	Basic and Diluted Earnings per Share			—				—				—				0.08				0.08
	Basic and Diluted Shares			9,155,199				—				9,155,199				—				9,155,199


			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended March 31, 2014
	Total Revenues			9,876				(9,876	)			—				—				—
	Operating Revenues			—				9,265				9,265				(36	)			9,229
	Cost of Revenues			587				(587	)			—				—				—
	Net Revenues			9,289				886				10,175				(196	)			9,979
	Total Expenses			11,754				587				12,341				356				12,697
	Other Income (Expenses), Net			299				(299	)			—				—				—
	Net Loss			(2,166	)			—				(2,166	)			(552	)			(2,718	)
	Basic and Diluted Earnings (Loss) per Share			(0.32	)			—				(0.32	)			(0.08	)			(0.40	)
	Basic and Diluted Shares			6,868,153				—				6,868,153				—				6,868,153

			As		Reclassifications		As				Adjustments				As Restated
			previously				reclassified
			reported
	For the three months ended December 31, 2013
	Total Revenues		*		*			—				—				—
	Operating Revenues		*		*			7,476				(199	)			7,277
	Cost of Revenues		*		*			—				—				—
	Net Revenues		*		*			8,460				(370	)			8,090
	Total Expenses		*		*			10,824				(405	)			10,419
	Other Income (Expenses), Net		*		*			—				—				—
	Net Loss		*		*			(2,364	)			35				(2,329	)

	*The three months ending December 31, 2013 were not previously presented as we are a smaller reporting company.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
For the three months ended September 30, 2013
Total Revenues			4,542				(4,542	)			—				—				—
Operating Revenues			—				4,405				4,405				111				4,516
Cost of Revenues			450				(450	)			—				—
Net Revenues			4,092				862				4,954				(185	)			4,769
Total Expenses			9,467				450				9,917				(236	)			9,681
Other Income (Expenses), Net			412				(412	)			—				—				—
Net Loss			(4,963	)			—				(4,963	)			51				(4,912	)
Basic and Diluted Earnings (Loss) per Share			(0.72	)			—				(0.72	)			0				(0.72	)
Basic and Diluted Shares			6,927,648				—				6,868,153				—				6,868,153


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended June 30, 2013
Total Revenues			3,405				(3,405	)			—				—				—
Operating Revenues			—				3,257				3,257				81				3,338
Cost of Revenues			550				(550	)			—				—				—
Net Revenues			2,855				1,133				3,988				(228	)			3,760
Total Expenses			19,030				611				19,641				(286	)			19,355
Other Income (Expenses), Net			522				(522	)			—				—				—
Net Loss			(15,653	)			—				(15,653	)			57				(15,596	)
Basic and Diluted Earnings (Loss) per Share			(2.39	)			(0	)			(2.39	)			0.01				(2.38	)
Basic and Diluted Shares			6,553,785				—				6,553,785				—				6,553,785


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended March 31, 2013
Total Revenues			1,703				(1,703	)			—				—				—
Operating Revenues			—				1,443				1,443				(48	)			1,395
Cost of Revenues			609				(609	)			—				—				—
Net Revenues			1,094				927				2,021				(259	)			1,762
Total Expenses			5,610				610				6,220				(288	)			5,932
Other Income (Expenses), Net			317				(317	)			—				—				—
Net Loss			(4,199	)			—				(4,199	)			29				(4,170	)
Basic and Diluted Earnings (Loss) per Share			(0.77	)			—				(0.77	)			0.01				(0.76	)
Basic and Diluted Shares			5,480,850				—				5,480,850				—				5,480,850

Prosper Funding LLC [Member]
Schedule of Quarterly Financial Information	The following tables present the impact of these corrections and corrections of other immaterial errors on the interim periods in the fiscal years ended December 31, 2014 and 2013 (in thousands):

			As		Reclassifications		As				Adjustments				As Restated
			previously				reclassified
			reported
	For the three months ended September 30, 2014
	Total Revenues		*		*			—				—				—
	Operating Revenues		*		*			10,783				284				11,067
	Cost of Revenues		*		*			—				—				—
	Net Revenues		*		*			11,716				346				12,062
	Total Expenses		*		*			8,196				(388	)			7,808
	Other Income		*		*			—				—				—
	Net Income		*		*			3,520				734				4,254

	*The revised revenue presentation was implemented for the three months ended September 30, 2014.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended June 30, 2014
	Total Revenues			7,766				(7,766	)			—				—				—
	Operating Revenues			—				6,852				6,852				1,428				8,280
	Cost of Revenues			710				(710	)			—				—				—
	Net Revenues			7,056				802				7,858				1,430				9,288
	Total Expenses			4,564				710				5,274				702				5,976
	Other Income			92				(92	)			—				—				—
	Net Income			2,584				—				2,584				728				3,312


			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended March 31, 2014
	Total Revenues			5,197				(5,197	)			—				—				—
	Operating Revenues			—				4,579				4,579				196				4,775
	Cost of Revenues			459				(459	)			—				—				—
	Net Revenues			4,738				750				5,488				156				5,644
	Total Expenses			2,941				459				3,400				596				3,996
	Other Income			291				(291	)			—				—				—
	Net Income			2,088				—				2,088				(440	)			1,648


			As		Reclassifications		As				Adjustments				As Restated
			previously				reclassified
			reported
	For the three months ended December 31, 2013		*		*
	Total Revenues		*		*			—				—				—
	Operating Revenues		*		*			3,859				(50	)			3,809
	Cost of Revenues		*		*			—				—				—
	Net Revenues		*		*			4,797				(14	)			4,783
	Total Expenses		*		*			3,118				24				3,142
	Other Income		*		*			—				—				—
	Net Income		*		*			1,679				(38	)			1,641

	*This period was not previously presented.

			As				Reclassifications				As				Adjustments				As Restated
			previously								reclassified
			reported
	For the three months ended September 30, 2013
	Total Revenues			2,646				(2,646	)			—				—				—
	Operating Revenues			—				2,131				2,131				157				2,288
	Cost of Revenues			291				(291	)			—				—				—
	Net Revenues			2,355				324				2,679				97				2,776
Total Expenses			1,738				291				2,029				80				2,109
Other Income			33				(33	)			—				—				—
Net Income			650				—				650				17				667

		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended June 30, 2013
Total Revenues			1,978				(1,978	)			—				—				—
Operating Revenues			—				1,546				1,546				(14	)			1,532
Cost of Revenues			388				(388	)			—				—				—
Net Revenues			1,590				686				2,276				(3	)			2,273
Total Expenses			810				388				1,198				29				1,227
Other Income			298				(298	)			—				—				—
Net Income			1,078				—				1,078				(32	)			1,046


		As				Reclassifications				As				Adjustments				As Restated
		previously								reclassified
		reported
For the three months ended March 31, 2013
Total Revenues			861				(861	)			—				—				—
Operating Revenues			—				607				607				—				607
Cost of Revenues			324				(324	)			—				—				—
Net Revenues			537				499				1,036				67				1,103
Total Expenses			525				324				849				15				864
Other Income			175				(175	)			—				—				—
Net Income			187				—				187				52				239

Organization_and_Business_Addi

Organization and Business - Additional Information (Details)	12 Months Ended
	Dec. 31, 2014
	State
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Entity incorporation date	22-Mar-05
Percentage of notes allowed for members to purchase	100.00%
Number of states and district marketplace is open to investors	31
Additional number of states and district marketplace is open to borrowers	46
Prosper Funding LLC [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Percentage of notes allowed for members to purchase	100.00%
Number of states and district marketplace is open to investors	31
Additional number of states and district marketplace is open to borrowers	46
Loan term, description	three or five years

Summary_of_Significant_Account3

Summary of Significant Accounting Policies - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
	Risk	Dec. 31, 2013
Significant Accounting Policies [Line Items]
Number of significant types of risks	2
Servicing fee (in hundredths)	1.00%
Advertising costs	$24,100,000	$12,700,000
Comprehensive income (loss)	0
Prosper Funding LLC [Member]
Significant Accounting Policies [Line Items]
Servicing fee (in hundredths)	1.00%
Comprehensive income (loss)	$0
Minimum [Member]
Significant Accounting Policies [Line Items]
Origination fee percentage (in hundredths)	1.00%
Minimum [Member] \| Internal Use Software and Website Development [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	1 year
Minimum [Member] \| Prosper Funding LLC [Member] \| Internal Use Software and Website Development [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	1 year
Maximum [Member]
Significant Accounting Policies [Line Items]
Origination fee percentage (in hundredths)	5.00%
Maximum [Member] \| Internal Use Software and Website Development [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	3 years
Maximum [Member] \| Prosper Funding LLC [Member] \| Internal Use Software and Website Development [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	3 years

Summary_of_Significant_Account4

Summary of Significant Accounting Policies - Assets and Liabilities Measured at Fair Value on a Recurring Basis (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Assets
Borrower Loans	$273,243	$233,105
Loans Held for Sale	8,463	3,206
Liabilities
Notes	273,783	234,218
Prosper Funding LLC [Member]
Assets
Borrower Loans	273,243	233,104
Loans Held for Sale	8,463	3,206
Liabilities
Notes	273,783	234,218
Recurring [Member]
Assets
Borrower Loans	273,243	233,105
Restricted Cash	81,300	50,074
Short Term Investments	1,274	1,271
Loans Held for Sale	8,463	3,206
Total Assets	364,280	287,656
Liabilities
Notes	273,783	234,218
Recurring [Member] \| Prosper Funding LLC [Member]
Assets
Borrower Loans	273,243	233,104
Restricted Cash	73,103	46,900
Short Term Investments	1,274
Loans Held for Sale	8,463	3,206
Total Assets	356,083	284,481
Short Term Investments		1,271
Liabilities
Notes	273,783	234,218
Recurring [Member] \| Level 1 Inputs [Member]
Assets
Restricted Cash	76,783	49,904
Total Assets	76,783	49,904
Recurring [Member] \| Level 1 Inputs [Member] \| Prosper Funding LLC [Member]
Assets
Restricted Cash	73,103	46,900
Total Assets	73,103	46,900
Recurring [Member] \| Level 2 Inputs [Member]
Assets
Restricted Cash	4,517	170
Short Term Investments	1,274	1,271
Total Assets	5,791	1,441
Recurring [Member] \| Level 2 Inputs [Member] \| Prosper Funding LLC [Member]
Assets
Short Term Investments	1,274
Total Assets	1,274	1,271
Short Term Investments		1,271
Recurring [Member] \| Level 3 Inputs [Member]
Assets
Borrower Loans	273,243	233,105
Loans Held for Sale	8,463	3,206
Total Assets	281,706	236,311
Liabilities
Notes	273,783	234,218
Recurring [Member] \| Level 3 Inputs [Member] \| Prosper Funding LLC [Member]
Assets
Borrower Loans	273,243	233,104
Loans Held for Sale	8,463	3,206
Total Assets	281,706	236,310
Liabilities
Notes	$273,783	$234,218

Summary_of_Significant_Account5

Summary of Significant Accounting Policies - Estimated Useful Lives of Assets (Details)	12 Months Ended
	Dec. 31, 2014
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	7 years
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Computers and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years
Leasehold Improvements [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	5 years
Leasehold Improvements [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	8 years
Internal Use Software and Website Development [Member] \| Minimum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	1 year
Internal Use Software and Website Development [Member] \| Maximum [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, estimated useful life	3 years

Property_and_Equipment_Net_Det

Property and Equipment, Net (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$19,849	$6,397
Less accumulated depreciation and amortization	-5,425	-3,371
Total property and equipment, net	14,424	3,026
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	4,042	3,217
Less accumulated depreciation and amortization	-2,917	-1,607
Total property and equipment, net	1,125	1,610
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	3,824	2,115
Internal-use Software and Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	4,486	3,592
Internal-use Software and Website Development Costs [Member] \| Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	4,042	3,217
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	1,904	39
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	5,274
Assets Not Yet Placed in Service [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$4,361	$651

Property_and_Equipment_Net_Add

Property and Equipment, Net - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment [Line Items]
Depreciation expense	$2,097,000	$1,094,000
Capitalized internal-use software and website development costs	846,000	1,561,000
Recorded internal-use software and website development impairment charges	322,000	299,000
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Depreciation expense	1,314,000	0
Capitalized internal-use software and website development costs	1,798,000	671,000
Recorded internal-use software and website development impairment charges	$17,000	$0

Borrower_Loans_Loans_Held_for_2

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Borrower Loans, Notes and Loans Held for Sale (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Borrower Loans [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	$268,598	$228,184
Fair value adjustments	4,645	4,921
Fair value	273,243	233,105
Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	268,598	228,183
Fair value adjustments	4,645	4,921
Fair value	273,243	233,104
Notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	-272,269	-232,093
Fair value adjustments	-1,514	-2,125
Fair value	-273,783	-234,218
Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	-272,269	-232,093
Fair value adjustments	-1,514	-2,125
Fair value	-273,783	-234,218
Loans Held for Sale [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	8,295	3,157
Fair value adjustments	168	49
Fair value	8,463	3,206
Loans Held for Sale [Member] \| Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	8,295	3,157
Fair value adjustments	168	49
Fair value	$8,463	$3,206

Borrower_Loans_Loans_Held_for_3

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Debt Instrument [Line Items]
Fixed interest rate, Minimum	5.77%	5.65%
Fixed interest rate, Maximum	33.04%	35.00%
Loans maturity date	31-Dec-19	31-Dec-18
Aggregate fair value adjustments	$16,300,000	$15,900,000
Minimum number of days for which loans originated were delinquent	90 days	90 days
Aggregate principal amount of loans originated	1,700,000	1,900,000
Fair value of loans originated	600,000	700,000
Borrower Loans receivable	0	0
Prosper Funding LLC [Member]
Debt Instrument [Line Items]
Fixed interest rate, Minimum	5.77%	5.65%
Fixed interest rate, Maximum	33.04%	35.00%
Loans maturity date	31-Dec-19	31-Dec-19
Aggregate fair value adjustments	16,300,000	15,800,000
Minimum number of days for which loans originated were delinquent	90 days	90 days
Aggregate principal amount of loans originated	1,500,000	1,900,000
Fair value of loans originated	140,000	700,000
Borrower Loans receivable	0	0
Borrower Loans [Member]
Debt Instrument [Line Items]
Increase in interest receivable	100,000	400,000
Borrower Loans [Member] \| Prosper Funding LLC [Member]
Debt Instrument [Line Items]
Increase in interest receivable	100,000	300,000
Notes [Member]
Debt Instrument [Line Items]
Increase in interest payable	200,000	50,000
Notes [Member] \| Prosper Funding LLC [Member]
Debt Instrument [Line Items]
Increase in interest payable	$200,000	$50,000
Minimum [Member]
Debt Instrument [Line Items]
Underlying notes and certificates original terms	36 months	12 months
Minimum [Member] \| Prosper Funding LLC [Member]
Debt Instrument [Line Items]
Underlying notes and certificates original terms	36 months	12 months
Maximum [Member]
Debt Instrument [Line Items]
Underlying notes and certificates original terms	60 months	60 months
Maximum [Member] \| Prosper Funding LLC [Member]
Debt Instrument [Line Items]
Underlying notes and certificates original terms	60 months	60 months

Borrower_Loans_Loans_Held_for_4

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Fair Value Assumptions for Loans Held for Sale, Borrower Loans and Notes (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans			$4,800
Notes			4,600
Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans			4,800
Notes			4,600
Discount rate assumption [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	5.25%	[1]
Discount rate assumption [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	5.25%	[1]
Discount rate assumption [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	5.25%	[1]
Discount rate assumption [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	5.25%	[1]
Discount rate assumption [Member] \| 100 Basis Point Increase [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	270,672
Discount rate assumption [Member] \| 100 Basis Point Increase [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	270,672
Discount rate assumption [Member] \| 100 Basis Point Increase [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	278,212
Discount rate assumption [Member] \| 100 Basis Point Increase [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	278,212
Discount rate assumption [Member] \| 200 Basis Point Increase [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	267,646
Discount rate assumption [Member] \| 200 Basis Point Increase [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	267,646
Discount rate assumption [Member] \| 200 Basis Point Increase [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	275,108
Discount rate assumption [Member] \| 200 Basis Point Increase [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	275,108
Discount rate assumption [Member] \| 100 Basis Point Decrease [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	276,983
Discount rate assumption [Member] \| 100 Basis Point Decrease [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	276,983
Discount rate assumption [Member] \| 100 Basis Point Decrease [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	284,683
Discount rate assumption [Member] \| 100 Basis Point Decrease [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	284,683
Discount rate assumption [Member] \| 200 Basis Point Decrease [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	280,274
Discount rate assumption [Member] \| 200 Basis Point Decrease [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	280,274
Discount rate assumption [Member] \| 200 Basis Point Decrease [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	288,059
Discount rate assumption [Member] \| 200 Basis Point Decrease [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	288,059
Default rate assumption [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	12.06%	[1]
Default rate assumption [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Default rate assumption (in hundredths)	12.06%	[1]
Default rate assumption [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Discount rate assumption (in hundredths)	12.06%
Default rate assumption [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Default rate assumption (in hundredths)	12.06%	[1]
Default rate assumption [Member] \| 0.8 Multiplier to Default Rate [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	280,696
Default rate assumption [Member] \| 0.8 Multiplier to Default Rate [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	280,696
Default rate assumption [Member] \| 0.8 Multiplier to Default Rate [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	288,507
Default rate assumption [Member] \| 0.8 Multiplier to Default Rate [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	288,507
Default rate assumption [Member] \| 0.9 Multiplier to Default Rate [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	277,253
Default rate assumption [Member] \| 0.9 Multiplier to Default Rate [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	277,253
Default rate assumption [Member] \| 0.9 Multiplier to Default Rate [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	284,968
Default rate assumption [Member] \| 0.9 Multiplier to Default Rate [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	284,968
Default rate assumption [Member] \| 1.1 Multiplier to Default Rate [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	270,357
Default rate assumption [Member] \| 1.1 Multiplier to Default Rate [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	270,357
Default rate assumption [Member] \| 1.1 Multiplier to Default Rate [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	277,881
Default rate assumption [Member] \| 1.1 Multiplier to Default Rate [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	277,881
Default rate assumption [Member] \| 1.2 Multiplier to Default Rate [Member] \| Notes [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	267,012
Default rate assumption [Member] \| 1.2 Multiplier to Default Rate [Member] \| Notes [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Notes	267,012
Default rate assumption [Member] \| 1.2 Multiplier to Default Rate [Member] \| Borrower Loans/Loans Held for Sale [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	274,443
Default rate assumption [Member] \| 1.2 Multiplier to Default Rate [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Fair Value Inputs, Assets, Quantitative Information [Line Items]
Borrower loans	274,443

[1]	Represents weighted average assumptions considering all credit grades.

Borrower_Loans_Loans_Held_for_5

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Changes in Level 3 Assets Measured at Fair Value on a Recurring Basis (Details) (Recurring [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	$2,093	($979)
Purchase of Loans/Issuance of Notes, Total	1,417,032	184,080
Principal repayments, Total	-173	-373
Borrower loans sold to third parties, Total	-1,411,625	-181,656
Change in fair value, Total	-596	-1,021
Ending balance, Total	7,923	2,093
Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	2,092	0
Principal repayments, Total	-172	-753
Ending balance, Total	7,923	2,092
Assets transferred, Total		-382
Originations, Total	1,417,032	184,080
Borrower loans sold to third parties, Total	-1,411,625	-181,645
Change in fair value of loans held for sale, Total	596	792
Notes [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	-234,218	-164,840
Purchase of Loans/Issuance of Notes, Liabilities	-176,865	-170,586
Principal repayments, Liabilities	120,909	89,681
Borrower loans sold to third parties, Liabilities	0	0
Change in fair value, Liabilities	16,391	11,527
Ending balance, Liabilities	-273,783	-234,218
Notes [Member] \| Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	-234,218	0
Principal repayments, Liabilities	120,909	82,924
Change in fair value, Liabilities	16,391	11,380
Ending balance, Liabilities	-273,783	-234,218
Liabilities transferred		-167,758
Originations, Liabilities	-176,865	-160,764
Borrower loans sold to third parties, Liabilities	0	0
Borrower Loans [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	233,105	163,861
Purchase of Loans/Issuance of Notes, Assets	177,088	169,859
Principal repayments, Assets	-121,082	-90,054
Borrower loans sold to third parties, Assets	0	0
Change in fair value, Assets	-15,868	-10,561
Ending balance, Assets	273,243	233,105
Borrower Loans [Member] \| Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	233,104	0
Principal repayments, Assets	-121,081	-83,677
Borrower loans sold to third parties, Assets	0	0
Change in fair value, Assets	-15,868	-10,632
Ending balance, Assets	273,243	233,104
Assets transferred		167,376
Originations, Assets	177,088	160,037
Loans Held for Sale [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	3,206
Purchase of Loans/Issuance of Notes, Assets	1,416,809	184,807
Principal repayments, Assets	0	0
Borrower loans sold to third parties, Assets	-1,411,625	-181,656
Change in fair value, Assets	73	55
Ending balance, Assets	8,463	3,206
Loans Held for Sale [Member] \| Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	3,206	0
Principal repayments, Assets	0	0
Borrower loans sold to third parties, Assets	-1,411,625	-181,645
Change in fair value, Assets	73	44
Ending balance, Assets	8,463	3,206
Assets transferred		0
Originations, Assets	$1,416,809	$184,807

Loan_Servicing_Assets_and_Liab2

Loan Servicing Assets and Liabilities - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets And Liabilities Fair Value [Line Items]
Gain on sales of whole loans	$4,000,000	$300,000
Impairment of loan	0	0
Fixed interest rate, Minimum	5.77%	5.65%
Fixed interest rate, Maximum	33.04%	35.00%
Loans maturity date	31-Dec-19	31-Dec-18
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Gain on sales of whole loans	4,000,000	300,000
Fixed interest rate, Minimum	5.77%	5.65%
Fixed interest rate, Maximum	33.04%	35.00%
Loans maturity date	31-Dec-19	31-Dec-19
Impairment of servicing assets	0	0
Borrower Loans [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	1,358,000,000	170,200,000
Fixed interest rate, Minimum	6.05%	6.05%
Fixed interest rate, Maximum	31.34%	31.34%
Loans maturity date	31-Dec-19	31-Dec-18
Debt instrument, Description	At December 31, 2014, Borrower Loans that were facilitated and subsequently sold to unrelated third parties, but for which we retained servicing rights had a total outstanding principle balance of $1,358 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and maturity dates through December 2019. At December 31, 2013, Borrower Loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $170.2 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and maturity dates through December 2018.
Borrower Loans [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	$1,045,000,000	$159,800,000
Fixed interest rate, Minimum	6.05%	6.05%
Fixed interest rate, Maximum	31.34%	31.34%
Loans maturity date	31-Dec-19	31-Dec-18
Debt instrument, Description	At December 31, 2014, loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $1,045 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and Maturity dates through December 2019. At December 31, 2013, loans that were facilitated and subsequently sold but for which we retained servicing rights had a total outstanding principle balance of $159.8 million, original terms between 36 and 60 months and had monthly payments with fixed interest rates ranging from 6.05% to 31.34% and Maturity dates through December 2018.
Minimum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	36 months	12 months
Minimum [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	36 months	12 months
Minimum [Member] \| Borrower Loans [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	36 months	36 months
Minimum [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	36 months	36 months
Maximum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	60 months	60 months
Maximum [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	60 months	60 months
Maximum [Member] \| Borrower Loans [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	60 months	60 months
Maximum [Member] \| Borrower Loans [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Borrower loans original maturity term	60 months	60 months

Loan_Servicing_Assets_and_Liab3

Loan Servicing Assets and Liabilities - Significant Unobservable Inputs (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate		0.70%
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate		0.70%
Minimum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	15.00%	15.00%
Default rate	2.62%	1.73%
Market servicing rate	0.63%
Minimum [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	2.62%	1.73%
Default rate	15.00%	15.00%
Market servicing rate	0.63%
Maximum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	25.00%	25.00%
Default rate	26.32%	19.75%
Market servicing rate	0.70%
Maximum [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	26.32%	19.75%
Default rate	25.00%	25.00%
Market servicing rate	0.70%

Loan_Servicing_Assets_and_Liab4

Loan Servicing Assets and Liabilities - Schedule of Servicing Assets and Liabilities at Amortized Value (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Loan servicing assets [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period	$460
Additions	4,700	496
Less: Amortization	-997	-36
Amortized cost at end of period	4,163	460
Fair Value at end of period	4,708
Loan servicing assets [Member] \| Prosper Funding LLC [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period	436
Additions	4,700	496
Less: Amortization	-799	-36
Amortized cost at end of period	3,116	436
Fair Value at end of period	3,515
Less: Transfers to PMI	-1,221	-24
Loan servicing liabilities [Member]
Servicing Liability at Amortized Cost [Roll Forward]
Amortized cost at beginning of the period	167
Additions	662	177
Less: Amortization	-205	-10
Amortized cost at end of the period	624	167
Fair Value at end of the period	595
Loan servicing liabilities [Member] \| Prosper Funding LLC [Member]
Servicing Liability at Amortized Cost [Roll Forward]
Amortized cost at beginning of the period	167
Additions	662	177
Less: Amortization	-205	-10
Amortized cost at end of the period	624	167
Fair Value at end of the period	$595

Loan_Servicing_Assets_and_Liab5

Loan Servicing Assets and Liabilities - Schedule of Estimated Fair Value of Servicing Assets and Liabilities (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014
Loan servicing assets [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Weighted average market servicing rate assumptions	0.63%
Increase (decrease) in fair value
Market servicing rate increase to 0.65%	($348)
Market servicing rate decrease to 0.60%	348
Applying a 1.1 multiplier to default rate	-88
Applying a 0.9 multiplier to default rate	89
Weighted average default assumptions	13.00%
Loan servicing assets [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Weighted average market servicing rate assumptions	0.63%
Increase (decrease) in fair value
Market servicing rate increase to 0.65%	-260
Market servicing rate decrease to 0.60%	260
Applying a 1.1 multiplier to default rate	-66
Applying a 0.9 multiplier to default rate	66
Weighted average default assumptions	10.00%
Loan servicing liabilities [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Weighted average market servicing rate assumptions	0.63%
Increase (decrease) in fair value
Market servicing rate increase to 0.65%	59
Market servicing rate decrease to 0.60%	-59
Applying a 1.1 multiplier to default rate	1
Applying a 0.9 multiplier to default rate	-1
Weighted average default assumptions	13.00%
Loan servicing liabilities [Member] \| Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Weighted average market servicing rate assumptions	0.63%
Increase (decrease) in fair value
Market servicing rate increase to 0.65%	59
Market servicing rate decrease to 0.60%	-59
Applying a 1.1 multiplier to default rate	1
Applying a 0.9 multiplier to default rate	($1)
Weighted average default assumptions	10.00%

Loan_Servicing_Assets_and_Liab6

Loan Servicing Assets and Liabilities - Schedule of Estimated Fair Value of Servicing Assets and Liabilities (Parenthetical) (Details)	12 Months Ended
	Dec. 31, 2014
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing rate increase	0.65%
Servicing rate decrease	0.60%
Default rate increase	1.10%
Default rate decrease	0.90%
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing rate increase	0.65%
Servicing rate decrease	0.60%
Default rate increase	1.10%
Default rate decrease	0.90%

Net_Loss_Per_Share_Additional_

Net Loss Per Share - Additional Information (Details)	0 Months Ended
Net Loss Per Share - Additional Information (Details)	Oct. 29, 2013
Earnings Per Share [Abstract]
Stock split conversion ratio	0.1

Net_Loss_Per_Share_Basic_and_D

Net Loss Per Share - Basic and Diluted Loss Per Share (Details) (USD $)	3 Months Ended						12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Numerator [Abstract]
Net loss available to common stockholders for basic and diluted EPS							($17,561)	($27,007)
Denominator [Abstract]
Weighted-Average Shares - Basic and Diluted Net Loss Per Share	9,280,334	9,155,199	6,868,153	6,868,153	6,553,785	5,480,850	8,896,801	6,596,827
Basic and diluted net loss per share (in dollars per share)	($1.24)	$0.08	($0.40)	($0.72)	($2.38)	($0.76)	($1.97)	($4.09)

Net_Loss_Per_Share_Dilutive_Sh

Net Loss Per Share - Dilutive Shares Excluded from the Diluted Net Loss Per Share Calculation (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net loss per common share computation (in shares)	39,986,111	33,981,988
Convertible Preferred Stock [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net loss per common share computation (in shares)	30,699,957	27,274,068
Stock Options Issued and Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net loss per common share computation (in shares)	4,994,998	894,976
Unvested Stock Options Exercised [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net loss per common share computation (in shares)	4,114,269	5,594,134
Warrants Issued and Outstanding [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Total common stock equivalents excluded from diluted net loss per common share computation (in shares)	176,887	218,810

Convertible_Preferred_Stock_an2

Convertible Preferred Stock and Stockholders' Equity (Deficit) - Additional Information (Details) (USD $)	0 Months Ended		12 Months Ended		1 Months Ended	0 Months Ended	1 Months Ended
	Jul. 16, 2014	Oct. 29, 2013	Dec. 31, 2014	Dec. 31, 2013	Jan. 31, 2013	Jun. 18, 2014	Sep. 30, 2013	31-May-14	15-May-14
Class of Stock [Line Items]
Proceeds from issuance of preferred stock			$69,958,000	$44,822,000
Converted ratio from preferred stock to common stock			1
Common stock convertible ratio if preferred stock did not participate			10
Repurchase of Preferred Stock	18,500,000		18,527,000
Stock split conversion ratio		0.1
Dividends			0
Common stock, shares authorized (in shares)			47,928,883	41,487,465
Common stock, par value (in dollars per share)			$0.01	$0.01
Common stock, shares issued (in shares)			14,448,700	13,588,803
Common stock, shares outstanding (in shares)			14,448,700	13,588,803
Reverse stock split, shares issued (in shares)			1
Reverse stock split, shares converted (in shares)			10
Proceeds from Exercise of Vested Stock Options			77,000	212,000
Common Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)			80,083,905
Exercise of stock options (in shares)			924,867	7,327,959
Proceeds from Exercise of Vested Stock Options			890,000	860,000
Exercise of nonvested stock options (in shares)			865,717	6,499,463
Unvested restricted stock outstanding (in shares)			4,114,269	5,594,134
Stock repurchase upon termination of employment (in shares)			181,893	414,130
Stock repurchase upon termination of employment			90,000	20,000
Exercise of common stock warrants (in shares)			116,923	820
Exercise of common stock warrants (in dollars per share)			$1.95	$0.10
Common Stock Warrant [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)									47,928,883
Common stock, par value (in dollars per share)									$0.01
Common stock, shares issued (in shares)			14,448,700	13,588,803
Common stock, shares outstanding (in shares)			14,448,700	13,588,803
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)					13,868,152
Convertible preferred stock, price per share (in dollars per share)					$1.44
Proceeds from issuance of preferred stock					19,800,000
Common stock, shares authorized (in shares)									13,868,152
Series A 1 Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)					5,117,182
Convertible preferred stock, price per share (in dollars per share)					$0.01
Liquidation preference per share (in dollars per share)			$10
Percentage of holders of preferred stock required to request for conversion, minimum (in hundredths)			14.00%
Conversion ratio of preferred stock into prosper common stock			1,000,000
Series A 1 [Member]
Class of Stock [Line Items]
Converted ratio from preferred stock to common stock			1,000,000
Liquidation preference per share (in dollars per share)			$10
Common stock, shares authorized (in shares)									5,117,182
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)						1,392,757	8,288,734
Convertible preferred stock, price per share (in dollars per share)						$14.36	$3.02
Proceeds from issuance of preferred stock							24,900,000
Liquidation preference per share (in dollars per share)			$3.02
Stock issued during the period (in shares)	1,133,558
Conversion ratio of preferred stock into prosper common stock			1
Series C Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)								4,880,954
Convertible preferred stock, price per share (in dollars per share)								$14.36
Proceeds from issuance of preferred stock								69,900,000
Liquidation preference per share (in dollars per share)			$14.36
Conversion ratio of preferred stock into prosper common stock			1
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Shares issued (in shares)						1,392,757
Convertible preferred stock, price per share (in dollars per share)						$14.36
Liquidation preference per share (in dollars per share)			$1.44
Stock issued during the period (in shares)	156,508
Conversion ratio of preferred stock into prosper common stock			1
Number of times the shareholders are entitled to receive the original issue price			3
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Value prior to closing of underwritten initial public offering			750,000,000
Aggregate proceeds to the entity before deducting underwriters commissions and expenses			$100,000,000
Percentage of holders of preferred stock required to request for conversion, minimum (in hundredths)			60.00%
Common stock, shares authorized (in shares)									8,288,734
Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)									32,155,022
Common stock, par value (in dollars per share)									$0.01
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Common stock, shares authorized (in shares)									4,880,954

Convertible_Preferred_Stock_an3

Convertible Preferred Stock and Stockholders' Equity (Deficit) - Summary of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$0.01	$0.01
Convertible preferred stock, shares authorized (in shares)	32,155,022	27,274,068
Convertible preferred stock, shares outstanding and issued (in shares)	30,699,957
Convertible preferred stock, liquidation preference	$160,952	$96,172
Series A Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$0.01
Convertible preferred stock, shares authorized (in shares)	13,868,152
Convertible preferred stock, shares outstanding and issued (in shares)	13,711,644
Convertible preferred stock, liquidation preference	19,774
Series A 1 [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$0.01
Convertible preferred stock, shares authorized (in shares)	5,117,182
Convertible preferred stock, shares outstanding and issued (in shares)	4,952,183
Convertible preferred stock, liquidation preference	49,522
Series B Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$0.01
Convertible preferred stock, shares authorized (in shares)	8,288,734
Convertible preferred stock, shares outstanding and issued (in shares)	7,155,176
Convertible preferred stock, liquidation preference	21,581
Series C Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$0.01
Convertible preferred stock, shares authorized (in shares)	4,880,954
Convertible preferred stock, shares outstanding and issued (in shares)	4,880,954
Convertible preferred stock, liquidation preference	$70,075

Stock_Option_Plan_and_Compensa2

Stock Option Plan and Compensation - Additional Information (Details) (USD $)	0 Months Ended	12 Months Ended
	Oct. 29, 2013	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the options		1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights		Options generally vest 25% one year from the vesting commencement date and 1/48th per month thereafter.
Options exercisable, maximum period		10 years
Stock split conversion ratio	0.1
Unrecognized cost of unvested share-based compensation awards.		$0
Dividend yield		0.00%	0.00%
Volatility of common stock		68.28%	75.34%
Risk-free interest rate		1.79%	1.78%
Expected life		5 years 8 months 12 days	5 years 9 months 18 days
Stock based compensation		2,011,000	246,000
Stock-Based Compensation Expense		2,042,000	246,000
Unamortized expense related to unvested stock-based awards		5,800,000
Remaining weighted average vesting period		3 years 4 months 24 days
Options Issued and Outstanding, Options granted		5,287,763
Weighted-Average Exercise Price, Options granted		$1.76
Weighted average grant fair value		$2.45
Options Issued and Outstanding, Options vested and exercisable at December 31, 2014		59,150
Stock option intrinsic value exercised		300,000
Stock options estimated aggregate fair value		13,000,000
Stock Options Issued and Outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense		600,000	0
Internal-use Software and Website Development Costs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense		21,000	23,000
Performance-based stock options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Dividend yield		1.66%
Volatility of common stock		66.00%
Risk-free interest rate		0.00%
Expected life		5 years 2 months 23 days
Performance-based stock options granted		2,032,896
Performance-based stock options granted, exercise price		$0.57
Performance-based stock options granted, contractual term		10 years
Performance-based stock options granted, vested		1,924,896
Performance-based stock options granted, forfeited		108,000
Stock based compensation		$587,000
2005 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options made available in pool (in shares)		14,195,255
Shares available for grant under the plan		1,488,494
Options Issued and Outstanding, Options granted		5,287,763	7,912,933
Weighted-Average Exercise Price, Options granted		$1.76	$0.10
Options Issued and Outstanding, Options vested and exercisable at December 31, 2014		3,921,049

Stock_Option_Plan_and_Compensa3

Stock Option Plan and Compensation - Schedule of Activity of Options that were Early Exercised under the Plan (Details) (Early Exercised Stock Options Under 2005 Stock Option Plan [Member], USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Early Exercised Stock Options Under 2005 Stock Option Plan [Member]
Early exercised options, unvested [Roll Forward]
Beginning balance	5,594,134
Exercise of non-vested stock options	865,717	6,499,463
Repurchase of restricted stock	-181,893	-414,130
Restricted stock vested	-2,165,689	-491,199
Ending balance	4,112,269	5,594,134
Options expected to vest	3,674,592
Weighted average exercise price [Abstract]
Beginning balance	$0.12
Exercise of non-vested stock options	$0.94	$0.11
Repurchase of restricted stock	$0.10	$0.21
Restricted stock vested	$0.16	$0.10
Ending balance	$0.25	$0.12
Options expected to vest	$0.25
Ending balance	2 years 2 months 23 days
Options expected to vest	2 years 2 months 23 days
Ending balance	$74,473
Options expected to vest	$66,547

Stock_Option_Plan_and_Compensa4

Stock Option Plan and Compensation - Additional Information Regarding Unvested Early exercised stock options outstanding (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
$0.10 - $0.10 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$0.10
Number Outstanding	3,520,635
Weighted Avg. Remaining Life	2 years 1 month 21 days
Weighted Avg. Exercise Price	$0.10
$0.57 - $0.57 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.57
Range of Exercise Prices, Maximum	$0.57
Number Outstanding	528,495
Weighted Avg. Remaining Life	2 years 7 months 21 days
Weighted Avg. Exercise Price	$0.57
$5.65 - $5.65 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$5.65
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	63,139
Weighted Avg. Remaining Life	2 years 7 months 2 days
Weighted Avg. Exercise Price	$5.65
$0.10 - $5.65 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	4,112,269
Weighted Avg. Remaining Life	2 years 2 months 23 days
Weighted Avg. Exercise Price	$0.25

Stock_Option_Plan_and_Compensa5

Stock Option Plan and Compensation - Summarized Option Activity under Option Plan (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Options Issued and Outstanding [Roll Forward]
Options Issued and Outstanding, Options granted	5,287,763
Options Issued and Outstanding, Options vested and exercisable at December 31, 2014	59,150
Weighted-Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Options granted	$1.76
2005 Stock Option Plan [Member]
Options Issued and Outstanding [Roll Forward]
Options Issued and Outstanding, Beginning Balance	894,976	1,173,816
Options Issued and Outstanding, Options granted	5,287,763	7,912,933
Options Issued and Outstanding, Options exercised â€“ vested	-59,150	-828,496
Options Issued and Outstanding, Options exercised â€“ nonvested	-865,717	-6,499,463
Options Issued and Outstanding, Options forefeited	-262,874	-863,814
Options Issued and Outstanding, Ending balance	4,994,998	894,976
Options Issued and Outstanding, Options vested and expected to vest as of December 31, 2014	4,463,370
Options Issued and Outstanding, Options vested and exercisable at December 31, 2014	3,921,049
Weighted-Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Beginning balance	$1.46	$2.03
Weighted-Average Exercise Price, Options granted	$1.76	$0.10
Weighted-Average Exercise Price, Options exercised â€“ vested	$1.30	$0.26
Weighted-Average Exercise Price, Options exercised â€“ nonvested	$0.94	$0.10
Weighted-Average Exercise Price, Options forefeited	$1.79	$1.17
Weighted-Average Exercise Price, Ending balance	$1.85	$1.46
Options expected to vest	$1.85
Weighted-Average Exercise Price, Options vested and exercisable at December 31, 2014	$1.32
Weighted-Average Contractual Term [Roll Forward]
Ending balance	8 years 11 months 1 day
Options expected to vest	8 years 11 months 1 day
Weighted Average Contractual Term, Options vested and exercisable at December 31, 2014	8 years 9 months
Aggregate Intrinsic Value [Roll Forward]
Aggregate Intrinsic Value, Ending balance	$81,219
Aggregate Intrinsic Value, Options vested and expected to vest as of December 31, 2014	72,574
Aggregate Intrinsic Value, Options vested and exercisable at December 31, 2014	$65,834

Stock_Option_Plan_and_Compensa6

Stock Option Plan and Compensation - Additional Information Regarding Common Stock Options Outstanding (Details) (USD $)	12 Months Ended
	Dec. 31, 2014
$0.10 - $0.10 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$0.10
Number Outstanding	3,520,635
Weighted Avg. Remaining Life	2 years 1 month 21 days
Weighted Avg. Exercise Price	$0.10
$0.10 - $0.10 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$0.10
Number Outstanding	163,883
Weighted Avg. Remaining Life	8 years 7 months 13 days
Weighted Avg. Exercise Price	$0.10
Options Exercisable [Abstract]
Number Exercisable	70,784
Weighted Avg. Exercise Price	$0.10
$0.57 - $0.57 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.57
Range of Exercise Prices, Maximum	$0.57
Number Outstanding	528,495
Weighted Avg. Remaining Life	2 years 7 months 21 days
Weighted Avg. Exercise Price	$0.57
$0.57 - $0.57 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.57
Range of Exercise Prices, Maximum	$0.57
Number Outstanding	3,170,301
Weighted Avg. Remaining Life	9 years 1 month 13 days
Weighted Avg. Exercise Price	$0.57
Options Exercisable [Abstract]
Number Exercisable	1,983,728
Weighted Avg. Exercise Price	$0.57
$1.20 - $1.20 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$1.20
Range of Exercise Prices, Maximum	$1.20
Number Outstanding	133,334
Weighted Avg. Remaining Life	6 years 8 months 16 days
Weighted Avg. Exercise Price	$1.20
Options Exercisable [Abstract]
Number Exercisable	121,874
Weighted Avg. Exercise Price	$1.20
$1.70 - $1.70 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$1.70
Range of Exercise Prices, Maximum	$1.70
Number Outstanding	77,552
Weighted Avg. Remaining Life	7 years 4 months 13 days
Weighted Avg. Exercise Price	$1.70
Options Exercisable [Abstract]
Number Exercisable	62,724
Weighted Avg. Exercise Price	$1.70
$2.00 - $2.00 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$2
Range of Exercise Prices, Maximum	$2
Number Outstanding	287,933
Weighted Avg. Remaining Life	5 years 6 months 22 days
Weighted Avg. Exercise Price	$2
Options Exercisable [Abstract]
Number Exercisable	287,869
Weighted Avg. Exercise Price	$2
$5.00 to $5.00 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$5
Range of Exercise Prices, Maximum	$5
Number Outstanding	7,000
Weighted Avg. Remaining Life	1 year 9 months
Weighted Avg. Exercise Price	$5
Options Exercisable [Abstract]
Number Exercisable	7,000
Weighted Avg. Exercise Price	$5
$5.60 - $5.60 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$5.60
Range of Exercise Prices, Maximum	$5.60
Number Outstanding	18,250
Weighted Avg. Remaining Life	4 years 8 months 16 days
Weighted Avg. Exercise Price	$5.60
Options Exercisable [Abstract]
Number Exercisable	18,250
Weighted Avg. Exercise Price	$5.60
$5.65 - $5.65 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$5.65
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	63,139
Weighted Avg. Remaining Life	2 years 7 months 2 days
Weighted Avg. Exercise Price	$5.65
$5.65 - $5.65 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$5.65
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	1,136,745
Weighted Avg. Remaining Life	9 years 8 months 16 days
Weighted Avg. Exercise Price	$5.65
Options Exercisable [Abstract]
Number Exercisable	737
Weighted Avg. Exercise Price	$5.65
$0.10 - $5.65 [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	4,112,269
Weighted Avg. Remaining Life	2 years 2 months 23 days
Weighted Avg. Exercise Price	$0.25
$0.10 - $5.65 [Member] \| Stock Options Issued and Outstanding [Member]
Options Outstanding [Abstract]
Range of Exercise Prices, Minimum	$0.10
Range of Exercise Prices, Maximum	$5.65
Number Outstanding	4,994,998
Weighted Avg. Remaining Life	8 years 11 months 1 day
Weighted Avg. Exercise Price	$1.85
Options Exercisable [Abstract]
Number Exercisable	2,552,966
Weighted Avg. Exercise Price	$0.83

Stock_Option_Plan_and_Compensa7

Stock Option Plan and Compensation - Fair Value of Stock Option Awards (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Fair value of stock option awards [Abstract]
Volatility of common stock	68.28%	75.34%
Risk-free interest rate	1.79%	1.78%
Expected life	5 years 8 months 12 days	5 years 9 months 18 days
Dividend yield	0.00%	0.00%

Stock_Option_Plan_and_Compensa8

Stock Option Plan and Compensation - Stock Based Compensation Included in Consolidated Statements of Operations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$2,011	$246
Origination and Servicing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	104	16
Sales and Marketing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	767	24
General and Administrative [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$1,140	$206

Income_Taxes_Additional_Inform

Income Taxes - Additional Information (Details) (USD $)	12 Months Ended
Income Taxes - Additional Information (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
Income Taxes [Line Items]
Current Federal Tax Expense (Benefit)	$0	$0
Current State and Local Tax Expense (Benefit)	0	0
Deferred Federal Income Tax Expense (Benefit)	0	0
Deferred State and Local Income Tax Expense (Benefit)	0	0
Federal tax at statutory rate	34.00%	34.00%
Deferred tax assets valuation, increased amount	1,600,000
Valuation allowance percentage change	6.00%
Valuation allowance as percentage of net deferred tax asset	100.00%
Valuation allowance	-29,498,000	-27,890,000
Unrecognized tax benefits that would affect effective tax rate	54,600,000
Income tax reconciliation [Abstract]
Net effective tax rate	0.00%	0.00%
Prosper Funding LLC [Member]
Income tax reconciliation [Abstract]
Income tax provision	0	0
Net effective tax rate	0.00%	0.00%
Federal [Member]
Income Taxes [Line Items]
Net operating loss	69,500,000
Operating loss carryforwards, expiration period	31-Dec-25
Tax year subject to examination	2011
Federal [Member] \| Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Research and development tax credits	0
California [Member]
Income Taxes [Line Items]
Net operating loss	83,800,000
Operating loss carryforwards, expiration period	31-Dec-15
Tax year subject to examination	2010
California [Member] \| Research Tax Credit Carryforward [Member]
Income Taxes [Line Items]
Research and development tax credits	$450,000

Income_Taxes_Effective_Income_

Income Taxes - Effective Income Tax Reconciliation (Details)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Effective income tax rate reconciliation [Abstract]
Federal tax at statutory rate	34.00%	34.00%
State tax at statutory rate (net of federal benefit)	1.00%	2.00%
Permanent items	31.00%	0.00%
Stock compensation	-9.00%	0.00%
Change in valuation allowance	-66.00%	-38.00%
Credits and Reserves	9.00%
Other	0.00%	2.00%
Total	0.00%	0.00%

Income_Taxes_Deferred_Tax_Asse

Income Taxes - Deferred Tax Assets and Liabilities (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax assets and liabilities [Abstract]
Net operating loss carry forwards	$24,565	$24,626
Research & other credits	420	277
Fixed assets	45	95
Settlement liability	2,964	3,654
Stock compensation	344	69
Accrued liabilities and other	2,320	247
Total	30,658	28,968
Fair value of loans	-1,160	-1,078
Valuation allowance	($29,498)	($27,890)

Income_Taxes_Unrecognized_Tax_

Income Taxes - Unrecognized Tax Benefits (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2014
Unrecognized tax benefits [Roll Forward]
Beginning balance	$219	$54,571
Increase related to tax position of prior years	54,352
Ending balance	$54,571	$54,571

Commitments_and_Contingencies_1

Commitments and Contingencies - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Nov. 30, 2008	Oct. 16, 2008
	Installment
	State
Commitments And Contingencies [Line Items]
Non cancelable operating lease expiration	2015-08
Office lease expiration	2022-06
Rental expense under operating lease arrangements	$2,000,000	$600,000
Minimum annual fee	1,400,000
Purchase of borrower loans	16,700,000
Outstanding balance of the borrower loan issued	1,358,000,000
Accrued repurchase and indemnification obligation	171,000	40,000
Securities Law Compliance [Abstract]
Amount of loans sold to lender members				178,000,000
Aggregate amount of payment for penalties			1,000,000
Number of states with which company entered into consent order	34
Aggregate amount paid by entity for penalties to states	470,000
Accrued contingent liability associated with states not entered into consent orders	250,000	250,000
Maximum fee liability taken to estimate accrued contingent liability	1,000,000
Agreed amount of settlement liability payable to plaintiffs	10,000,000
Number of annual installments paid to plaintiffs	4
Settlement installment due in 2014	2,000,000
Settlement installment due in 2015	2,000,000
Settlement installment due in 2016	3,000,000
Settlement installment due in 2017	3,000,000
Class action settlement liability	7,861,000	9,739,000
Prosper Funding LLC [Member]
Commitments And Contingencies [Line Items]
Minimum annual fee	1,400,000
Purchase of borrower loans	16,700,000
Outstanding balance of the borrower loan issued	1,358,000,000
Accrued repurchase and indemnification obligation	$171,000	$40,000
San Francisco California
Commitments And Contingencies [Line Items]
Non cancelable operating lease expiration	2023-02

Commitments_and_Contingencies_2

Commitments and Contingencies - Future Minimum Lease Payments (Details) (USD $)	Dec. 31, 2014
In Thousands, unless otherwise specified	Dec. 31, 2014
Operating Leases Future Minimum Payments Due [Abstract]
2015	$2,425
2016	3,755
2017	3,866
2018	3,977
2019	4,093
Thereafter	13,091
Total future operating lease obligations	$31,207

Related_Parties_Additional_Inf

Related Parties - Additional Information (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Minimum percentage of voting securities considered for related parties	10.00%
Servicing fees revenue earned by entity	$13	$1
Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Minimum percentage of voting securities considered for related parties	10.00%
Servicing fees revenue earned by entity	$13	$1

Related_Parties_Aggregate_Amou

Related Parties - Aggregate Amount of Notes Purchased and the Income Earned (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	$1,169	$1,823
Interest earned on Notes	173	64
Notes balance	1,690	1,389
Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	1,127	1,096
Interest earned on Notes	163	12
Notes balance	1,614	1,067
Directors [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	42	727
Interest earned on Notes	10	52
Notes balance	$76	$322

Postretirement_Benefit_Plans_A

Postretirement Benefit Plans - Additional Information (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract]
Deferred compensation arrangement with eligible employees, percentage	90.00%
Employer contribution during the period	$380,000	$0

Significant_Concentrations_Det

Significant Concentrations (Details)	12 Months Ended
Significant Concentrations (Details)	Dec. 31, 2014	Dec. 31, 2013
Party 1 [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	37.00%	31.00%
Party 1 [Member] \| Prosper Funding LLC [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	37.00%	31.00%
Party 2 [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	13.00%	16.00%
Party 2 [Member] \| Prosper Funding LLC [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	13.00%	16.00%
Party 3 [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	22.00%	4.00%
Party 3 [Member] \| Prosper Funding LLC [Member]
Significant Concentrations [Line Items]
Percentage of loans purchased	22.00%	4.00%

Segments_Additional_Informatio

Segments - Additional Information (Details)	12 Months Ended
	Dec. 31, 2014
	Segment
Segment Reporting [Abstract]
Number of Reportable Segments	1

Prior_Period_Adjustments_Addit

Prior Period Adjustments - Additional Information (Details) (USD $)	3 Months Ended							12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Overstatement of transaction fee revenues and origination and Servicing expenses									$1,300,000
Understatement of transaction fee revenue									1,100,000
Change in fair values on borrower loans, loans held for sale and notes									550,000
Reclassification, Convertible Preferred Stock to Temporary Equity	0	114,800,000	44,900,000	44,900,000	44,900,000	19,900,000	19,900,000		44,800,000
Overstatement of gain recognized on sale of loans									25,000
Amount reclassified from adjusted gross servicing asset									400
Reclassification, accounts payable and other liabilities									170
Administrative expense due to overstatement of class action settlement liability									260
Borrower Loans And Notes								1,900,000
Borrower loans				4,800,000					4,800,000
Notes				4,600,000					4,600,000
Notes balance				800,000					800,000
Understatement of Payable Investors				800,000					800,000
Impairment Charges								322,000	299,000
Depreciation and Amortization								2,097,000	1,094,000
Property and Equipment, Net				3,026,000				14,424,000	3,026,000
Overstatement of deferred tax related NOL carryforward and valuation allowance									12,000,000
Understatement of Cash Flows from Operating Activities								-2,900,000	-21,652,000
Overstatement of Cash Flows from Investing Activities								-73,357,000	-88,856,000
Understatement of Cash Flows from Financing Activities								108,475,000	126,547,000
Understatement of calculation of weighted average shares									29,626
Overstatement of Earnings Per Share Basic And Diluted									$0.02
Prosper Funding LLC [Member]
Overstatement of transaction fee revenues and origination and Servicing expenses									1,900,000
Overstatement of gain recognized on sale of loans									250,000
Amount reclassified from adjusted gross servicing asset									400,000
Reclassification, accounts payable and other liabilities									170,000
Borrower loans				4,800,000					4,800,000
Notes				4,600,000					4,600,000
Notes balance				800,000					800,000
Understatement of Payable Investors				800,000					800,000
Impairment Charges								17,000	0
Depreciation and Amortization								1,331,000	671,000
Property and Equipment, Net				1,610,000				1,125,000	1,610,000
Overstatement of Note Balances									1,400,000
Understatement of Payable Investors									1,400,000
Understatement of Cash Flows from Operating Activities								3,946,000	2,801,000
Overstatement of Cash Flows from Investing Activities								-56,914,000	-86,733,000
Understatement of Cash Flows from Financing Activities								70,956,000	89,716,000
Adjustment [Member]
Restricted cash				35,872,000					35,872,000
Impairment Charges									240,000
Depreciation and Amortization									133,000
Property and Equipment, Net				-370,000					-370,000
Overstatement of Note Balances									1,400,000
Understatement of Payable Investors									1,400,000
Understatement of Cash Flows from Operating Activities									-3,100,000
Overstatement of Cash Flows from Investing Activities									19,000,000
Understatement of Cash Flows from Financing Activities									-15,900,000
Common shares outstanding				13,588,803					13,588,803
Adjustment [Member] \| Prosper Funding LLC [Member]
Restricted cash				35,600,000					35,600,000
Depreciation and Amortization									133,000
Property and Equipment, Net				-370,000					-370,000
Understatement of Cash Flows from Operating Activities									4,556,000
Overstatement of Cash Flows from Investing Activities									-20,442,000
Understatement of Cash Flows from Financing Activities									15,886,000
Previously Stated [Member]
Depreciation and Amortization									961,000
Property and Equipment, Net				3,396,000					3,396,000
Common shares outstanding				13,902,478					13,902,478
Previously Stated [Member] \| Prosper Funding LLC [Member]
Depreciation and Amortization									538,000
Property and Equipment, Net				1,980,000					1,980,000
Understatement of Cash Flows from Operating Activities									-1,755,000
Overstatement of Cash Flows from Investing Activities									-66,291,000
Understatement of Cash Flows from Financing Activities									$73,830,000

Prior_Period_Adjustments_Conso

Prior Period Adjustments - Consolidated Balance Sheets (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
ASSETS
Cash and Cash Equivalents	$50,557	$18,339	$2,300
Restricted Cash	81,300	49,824
Short Term Investments	1,274	1,271
Accounts Receivable	3,152	296
Loans Held for Sale, at Fair Value	8,463	3,206
Borrower Loans, at Fair Value	273,243	233,105
Property and Equipment, Net	14,424	3,026
Prepaid and Other Assets	7,745	1,192
Total Assets	440,158	310,259
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities	17,239	3,388
Payable to Investors	64,494	38,025
Class Action Settlement Liability	7,861	9,739
Notes, at Fair Value	273,783	234,218
Repurchase Liability for Unvested Restricted Stock Awards	1,010	559
Total Liabilities	364,387	285,929
Convertible Preferred Stock		44,822
Stockholders' Equity (Deficit)
Convertible Preferred Stock	111,145	44,822
Common Stock	102	75
Additional Paid-In Capital	86,340	83,676
Less: Treasury Stock	-303	-291
Accumulated Deficit	-121,513	-103,952
Total Stockholders' Equity (Deficit)	-35,374	-20,492	-74,333
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)	440,158	310,259
Prosper Funding LLC [Member]
ASSETS
Cash and Cash Equivalents	23,777	5,789	5
Restricted Cash	73,103	46,650
Short Term Investments	1,274	1,271
Loans Held for Sale, at Fair Value	8,463	3,206
Borrower Loans, at Fair Value	273,243	233,104
Property and Equipment, Net	1,125	1,610
Other Assets	3,120	443
Total Assets	385,240	292,073
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities	1,357	405
Payable to Investors	63,809	38,021
Notes, at Fair Value	273,783	234,218
Related Party Payable		205
Total Liabilities	338,949	272,849
Stockholders' Equity (Deficit)
Member's Equity	29,619	15,836
Accumulated Deficit	16,672	3,388
Total Stockholders' Equity (Deficit)	46,291	19,224	5
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)	385,240	292,073
Previously Stated [Member]
ASSETS
Cash and Cash Equivalents		18,339	2,300
Restricted Cash		15,473
Accounts Receivable		218
Loans Held for Sale, at Fair Value		3,917
Borrower Loans, at Fair Value		226,238
Property and Equipment, Net		3,396
Prepaid and Other Assets		708
Total Assets		268,289
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		6,737
Class Action Settlement Liability		10,000
Notes, at Fair Value		226,794
Repurchase and Indemnification Obligation		32
Repurchase Liability for Unvested Restricted Stock Awards		609
Total Liabilities		244,172
Stockholders' Equity (Deficit)
Convertible Preferred Stock		273
Common Stock		75
Additional Paid-In Capital		128,140
Less: Treasury Stock		-291
Accumulated Deficit		-104,080
Total Stockholders' Equity (Deficit)		24,117	6,037
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		268,289
Previously Stated [Member] \| Prosper Funding LLC [Member]
ASSETS
Cash and Cash Equivalents		5,789	5
Restricted Cash		12,299
Loans Held for Sale, at Fair Value		3,917
Borrower Loans, at Fair Value		226,238
Property and Equipment, Net		1,980
Other Assets		14
Total Assets		250,237
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		3,712
Notes, at Fair Value		226,794
Repurchase and Indemnification Obligation		32
Related Party Payable		205
Total Liabilities		230,743
Stockholders' Equity (Deficit)
Member's Equity		16,076
Accumulated Deficit		3,418
Total Stockholders' Equity (Deficit)		19,494
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		250,237
Reclassification
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		-3,690
Payable to Investors		2,480
Notes, at Fair Value		1,242
Repurchase and Indemnification Obligation		-32
Reclassification \| Prosper Funding LLC [Member]
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		-3,690
Payable to Investors		2,480
Notes, at Fair Value		1,242
Repurchase and Indemnification Obligation		-32
As Reclassified
ASSETS
Cash and Cash Equivalents		18,339
Restricted Cash		15,473
Accounts Receivable		218
Loans Held for Sale, at Fair Value		3,917
Borrower Loans, at Fair Value		226,238
Property and Equipment, Net		3,396
Prepaid and Other Assets		708
Total Assets		268,289
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		3,047
Payable to Investors		2,480
Class Action Settlement Liability		10,000
Notes, at Fair Value		228,036
Repurchase Liability for Unvested Restricted Stock Awards		609
Total Liabilities		244,172
Stockholders' Equity (Deficit)
Convertible Preferred Stock		273
Common Stock		75
Additional Paid-In Capital		128,140
Less: Treasury Stock		-291
Accumulated Deficit		-104,080
Total Stockholders' Equity (Deficit)		24,117
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		268,289
As Reclassified \| Prosper Funding LLC [Member]
ASSETS
Cash and Cash Equivalents		5,789
Restricted Cash		12,299
Loans Held for Sale, at Fair Value		3,917
Borrower Loans, at Fair Value		226,238
Property and Equipment, Net		1,980
Other Assets		14
Total Assets		250,237
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		22
Payable to Investors		2,480
Notes, at Fair Value		228,036
Related Party Payable		205
Total Liabilities		230,743
Stockholders' Equity (Deficit)
Member's Equity		16,076
Accumulated Deficit		3,418
Total Stockholders' Equity (Deficit)		19,494
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		250,237
Adjustment [Member]
ASSETS
Restricted Cash		34,351
Short Term Investments		1,271
Accounts Receivable		78
Loans Held for Sale, at Fair Value		-711
Borrower Loans, at Fair Value		6,867
Property and Equipment, Net		-370
Prepaid and Other Assets		484
Total Assets		41,970
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		341
Payable to Investors		35,545
Class Action Settlement Liability		-261
Notes, at Fair Value		6,182
Repurchase Liability for Unvested Restricted Stock Awards		-50
Total Liabilities		41,757
Convertible Preferred Stock		44,822
Stockholders' Equity (Deficit)
Convertible Preferred Stock		-273
Additional Paid-In Capital		-44,464
Accumulated Deficit		128
Total Stockholders' Equity (Deficit)		-44,609	-80,370
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		41,970
Adjustment [Member] \| Prosper Funding LLC [Member]
ASSETS
Restricted Cash		34,351
Short Term Investments		1,271
Loans Held for Sale, at Fair Value		-711
Borrower Loans, at Fair Value		6,866
Property and Equipment, Net		-370
Other Assets		429
Total Assets		41,836
LIABILITIES, CONVERTIBLE PREFERRED STOCK AND STOCKHOLDERS' EQUITY (DEFICIT)
Accounts Payable and Accrued Liabilities		383
Payable to Investors		35,541
Notes, at Fair Value		6,182
Total Liabilities		42,106
Stockholders' Equity (Deficit)
Member's Equity		-240
Accumulated Deficit		-30
Total Stockholders' Equity (Deficit)		-270
Total Liabilities, Convertible Preferred Stock and Stockholders' Equity (Deficit)		$41,836

Prior_Period_Adjustments_Conso1

Prior Period Adjustments - Consolidated Statements of Operations (Details) (USD $)	3 Months Ended							12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Operating Revenues
Transaction Fees, Net								$68,229	$15,330
Servicing Fees, Net								4,552	259
Other Revenues								5,055	937
Total Operating Revenues	24,209	17,387	9,229	7,277	4,516	3,338	1,395	77,836	16,526
Interest Income on Borrower Loans								42,087	34,995
Interest Expense on Notes								-38,734	-33,321
Net Interest Income								3,353	1,674
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net								128	181
Total Net Revenues	25,125	18,293	9,979	8,090	4,769	3,760	1,762	81,317	18,381
Interest Income on Borrower Loans								42,087	34,995
Interest Expense on Notes								-38,734	-33,321
Net Interest Income								3,353	1,674
Total Net Revenues	25,125	18,293	9,979	8,090	4,769	3,760	1,762	81,317	18,381
Expenses
Depreciation and Amortization								2,097	1,094
Origination and Servicing								14,098	6,384
Sales and Marketing								41,971	16,731
General and Administrative								27,917	22,273
Total Expenses	21,781	17,579	12,697	10,419	9,681	19,355	5,932	83,986	45,388
Total Expenses	21,781	17,579	12,697	10,419	9,681	19,355	5,932	83,986	45,388
Interest Income on Borrower Loans								42,087	34,995
Interest Expense on Notes								-38,734	-33,321
Net Interest Income								3,353	1,674
Net Income (Loss)	3,344	714	-2,718	-2,329	-4,912	-15,596	-4,170	-2,669	-27,007
Prosper Funding LLC [Member]
Operating Revenues
Servicing Fees, Net								4,168	372
Other Revenues								3,733	233
Total Operating Revenues	11,067	8,280	4,775	3,809	2,288	1,532	607	36,420	8,237
Administration Fee Revenue â€“ Related Party								28,519	7,632
Interest Income on Borrower Loans								42,370	32,605
Interest Expense on Notes								-38,734	-30,756
Net Interest Income								3,636	1,849
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net								209	849
Total Net Revenues	12,062	9,288	5,644	4,783	2,776	2,273	1,103	40,265	10,935
Interest Income on Borrower Loans								42,370	32,605
Interest Expense on Notes								-38,734	-30,756
Net Interest Income								3,636	1,849
Total Net Revenues	12,062	9,288	5,644	4,783	2,776	2,273	1,103	40,265	10,935
Cost of Revenues
Servicing								4,615	2,022
Expenses
Depreciation and Amortization								1,331	671
Origination and Servicing									2,022
General and Administrative								506	267
Administration Fee â€“ Related Party								21,860	5,053
Total Expenses	7,808	5,976	3,996	3,142	2,109	1,227	864	26,981	7,342
Total Expenses	7,808	5,976	3,996	3,142	2,109	1,227	864	26,981	7,342
Interest Income on Borrower Loans								42,370	32,605
Interest Expense on Notes								-38,734	-30,756
Net Interest Income								3,636	1,849
Net Income (Loss)	4,254	3,312	1,648	1,641	667	1,046	239	13,284	3,593
Previously Stated [Member]
Operating Revenues
Transaction Fees, Net									16,471
Rebates and promotions									-1,534
Total Operating Revenues	25,129								14,937
Interest Income									3
Interest Income on Borrower Loans									35,526
Interest Expense on Notes									-33,072
Net Interest Income									2,454
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									877
Total Net Revenues	26,043	16,464	9,289		4,092	2,855	1,094		18,268
Interest Income on Borrower Loans									35,526
Interest Expense on Notes									-33,072
Net Interest Income									2,454
Total Net Revenues	26,043	16,464	9,289		4,092	2,855	1,094		18,268
Cost of Revenues
Servicing									-2,056
Provision for repurchase and indemnification obligation									-118
Net revenues									-2,174
Expenses
Compensation and benefits									13,079
Marketing and advertising									14,851
Depreciation and Amortization									961
Professional services									1,979
Facilities and maintenance									1,764
Class action settlement									10,000
Loss on impairment									62
Other									1,733
Total Expenses	23,319	16,559	11,754		9,467	19,030	5,610		44,429
Total Expenses	23,319	16,559	11,754		9,467	19,030	5,610		44,429
Interest Income									3
Interest Income on Borrower Loans									35,526
Interest Expense on Notes									-33,072
Net Interest Income									2,454
Other income									1,151
Net Income (Loss)	2,724	-3	-2,166		-4,963	-15,653	-4,199		-27,181
Previously Stated [Member] \| Prosper Funding LLC [Member]
Operating Revenues
Total Operating Revenues									7,632
Administration Fee Revenue â€“ Related Party									7,632
Interest Income on Borrower Loans									32,862
Interest Expense on Notes									-30,564
Net Interest Income									2,298
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									877
Total Net Revenues		7,056	4,738		2,355	1,590	537		10,807
Interest Income on Borrower Loans									32,862
Interest Expense on Notes									-30,564
Net Interest Income									2,298
Total Net Revenues		7,056	4,738		2,355	1,590	537		10,807
Cost of Revenues
Servicing									-1,270
Provision for repurchase and indemnification obligation									-83
Net revenues									-1,353
Expenses
Depreciation and Amortization									538
Professional services									26
Administration Fee â€“ Related Party									5,053
Other Operating Expenses									242
Total Expenses		4,564	2,941		1,738	810	525		5,859
Total Expenses		4,564	2,941		1,738	810	525		5,859
Interest Income on Borrower Loans									32,862
Interest Expense on Notes									-30,564
Net Interest Income									2,298
Other income		92	291		33	298	175		28
Net Income (Loss)		2,584	2,088		650	1,078	187		3,623
Reclassification
Operating Revenues
Transaction Fees, Net									-1,094
Rebates and promotions									1,534
Servicing Fees, Net									-69
Other Revenues									1,274
Total Operating Revenues									1,645
Interest Income									-3
Interest Income on Borrower Loans									-609
Interest Expense on Notes									118
Net Interest Income									-491
Total Net Revenues									1,154
Interest Income on Borrower Loans									-609
Interest Expense on Notes									118
Net Interest Income									-491
Total Net Revenues									1,154
Cost of Revenues
Servicing									2,056
Provision for repurchase and indemnification obligation									118
Net revenues									2,174
Expenses
Compensation and benefits									-13,079
Marketing and advertising									-14,851
Depreciation and Amortization									-961
Professional services									-1,979
Facilities and maintenance									-1,764
Class action settlement									-10,000
Loss on impairment									-62
Other									-1,733
Origination and Servicing									7,465
Sales and Marketing									16,740
General and Administrative									22,398
Total Expenses									2,174
Total Expenses									2,174
Interest Income									-3
Interest Income on Borrower Loans									-609
Interest Expense on Notes									118
Net Interest Income									-491
Other income									-1,151
Reclassification \| Prosper Funding LLC [Member]
Operating Revenues
Servicing Fees, Net									397
Other Revenues									28
Total Operating Revenues									425
Interest Income on Borrower Loans									-397
Net Interest Income									-397
Total Net Revenues									-397
Interest Income on Borrower Loans									-397
Net Interest Income									-397
Total Net Revenues									-397
Cost of Revenues
Servicing									1,270
Provision for repurchase and indemnification obligation									83
Net revenues									1,353
Expenses
Depreciation and Amortization									-538
Professional services									-26
Origination and Servicing									1,891
General and Administrative									268
Other Operating Expenses									-242
Total Expenses									1,353
Total Expenses									1,353
Interest Income on Borrower Loans									-397
Net Interest Income									-397
Other income									-28
As Reclassified
Operating Revenues
Transaction Fees, Net									15,377
Servicing Fees, Net									-69
Other Revenues									1,274
Total Operating Revenues	25,129	16,371	9,265	7,476	4,405	3,257	1,443		16,582
Interest Income on Borrower Loans									34,917
Interest Expense on Notes									-32,954
Net Interest Income									1,963
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									877
Total Net Revenues	26,043	17,377	10,175	8,460	4,954	3,988	2,021		19,422
Interest Income on Borrower Loans									34,917
Interest Expense on Notes									-32,954
Net Interest Income									1,963
Total Net Revenues	26,043	17,377	10,175	8,460	4,954	3,988	2,021		19,422
Expenses
Origination and Servicing									7,465
Sales and Marketing									16,740
General and Administrative									22,398
Total Expenses	23,319	17,382	12,341	10,824	9,917	19,641	6,220		46,603
Total Expenses	23,319	17,382	12,341	10,824	9,917	19,641	6,220		46,603
Interest Income on Borrower Loans									34,917
Interest Expense on Notes									-32,954
Net Interest Income									1,963
Net Income (Loss)	2,724	-5	-2,166	-2,364	-4,963	-15,653	-4,199		-27,181
As Reclassified \| Prosper Funding LLC [Member]
Operating Revenues
Servicing Fees, Net									397
Other Revenues									28
Total Operating Revenues	10,783	6,852	4,579	3,859	2,131	1,546	607		8,057
Administration Fee Revenue â€“ Related Party									7,632
Interest Income on Borrower Loans									32,465
Interest Expense on Notes									-30,564
Net Interest Income									1,901
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									877
Total Net Revenues	11,716	7,858	5,488	4,797	2,679	2,276	1,036		10,835
Interest Income on Borrower Loans									32,465
Interest Expense on Notes									-30,564
Net Interest Income									1,901
Total Net Revenues	11,716	7,858	5,488	4,797	2,679	2,276	1,036		10,835
Expenses
Origination and Servicing									1,891
General and Administrative									268
Administration Fee â€“ Related Party									5,053
Total Expenses	8,196	5,274	3,400	3,118	2,029	1,198	849		7,212
Total Expenses	8,196	5,274	3,400	3,118	2,029	1,198	849		7,212
Interest Income on Borrower Loans									32,465
Interest Expense on Notes									-30,564
Net Interest Income									1,901
Net Income (Loss)	3,520	2,584	2,088	1,679	650	1,078	187		3,623
Adjustment [Member]
Operating Revenues
Transaction Fees, Net									-47
Servicing Fees, Net									328
Other Revenues									-337
Total Operating Revenues	-920	1,016	-36	-199	111	81	-48		-56
Interest Income on Borrower Loans									78
Interest Expense on Notes									-367
Net Interest Income									-289
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									-696
Total Net Revenues	-918	916	-196	-370	-185	-228	-259		-1,041
Interest Income on Borrower Loans									78
Interest Expense on Notes									-367
Net Interest Income									-289
Total Net Revenues	-918	916	-196	-370	-185	-228	-259		-1,041
Expenses
Depreciation and Amortization									133
Origination and Servicing									-1,081
Sales and Marketing									-9
General and Administrative									-125
Total Expenses	-1,538	197	356	-405	-236	-286	-288		-1,215
Total Expenses	-1,538	197	356	-405	-236	-286	-288		-1,215
Interest Income on Borrower Loans									78
Interest Expense on Notes									-367
Net Interest Income									-289
Net Income (Loss)	620	719	-552	35	51	57	29		174
Adjustment [Member] \| Prosper Funding LLC [Member]
Operating Revenues
Servicing Fees, Net									-25
Other Revenues									205
Total Operating Revenues	284	1,428	196	-50	157	-14			180
Interest Income on Borrower Loans									140
Interest Expense on Notes									-192
Net Interest Income									-52
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net									-28
Total Net Revenues	346	1,430	156	-14	97	-3	67		100
Interest Income on Borrower Loans									140
Interest Expense on Notes									-192
Net Interest Income									-52
Total Net Revenues	346	1,430	156	-14	97	-3	67		100
Expenses
Depreciation and Amortization									133
Origination and Servicing									131
General and Administrative									-1
Total Expenses	-388	702	596	24	80	29	15		130
Total Expenses	-388	702	596	24	80	29	15		130
Interest Income on Borrower Loans									140
Interest Expense on Notes									-192
Net Interest Income									-52
Net Income (Loss)	$734	$728	($440)	($38)	$17	($32)	$52		($30)

Prior_Period_Adjustments_Conso2

Prior Period Adjustments - Consolidated Statements of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Cash Flows from Operating Activities:
Net Income (Loss)	($2,669)	($27,007)
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868	10,561
Change in Fair Value of Loans Held For Sale	-73	-55
Change in Fair Value of Notes	-16,391	-11,527
Depreciation and Amortization	2,097	1,094
Change in Servicing Rights	-3,256	-329
Stock-Based Compensation Expense	2,042	246
Loss on Impairment of Property and Equipment	322	299
Class Action Settlement Liability	-2,000	9,739
Purchase of Loans Held for Sale at Fair Value	-1,416,809	-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625	181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145	-21,205
Accounts Receivable	-2,856	-256
Prepaid and Other Assets	-2,840	-320
Accounts Payable and Accrued Liabilities	11,844	-769
Payable to Investors	26,219	21,028
Net cash used in Operating Activities		-21,652
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088	-169,859
Principal Payments of Borrower Loans Held at Fair Value	121,082	90,054
Purchases of Property and Equipment		-2,714
Maturities of Short Term Investments	1,271	2,619
Purchases of Short Term Investments	-1,274	-1,271
Changes in Restricted Cash Related to Investing Activities	-5,081	-7,685
Net Cash Used in Investing Activities		-88,856
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865	170,586
Payment of Notes Held at Fair Value	-120,909	-89,681
Proceeds from Issuance of Convertible Preferred Stock, Net	69,958	44,822
Proceeds from Early Exercise of Stock Options	814	694
Repurchase of Restricted Stock	-30	-86
Proceeds from Exercise of Vested Stock Options	77	212
Net Cash Provided by Financing Activities		126,547
Net Increase (Decrease) in Cash and Cash Equivalents	32,218	16,039
Cash and Cash Equivalents at Beginning of the Year	18,339	2,300
Cash and Cash Equivalents at End of the Year	50,557	18,339
Cash Paid for Interest	41,053	35,027
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	1,550	175
Cash Flows from Operating Activities:
Net Income (Loss)	-2,669	-27,007
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868	10,561
Change in Fair Value of Loans Held For Sale	-73	-55
Change in Fair Value of Notes	-16,391	-11,527
Depreciation and Amortization	2,097	1,094
Change in Servicing Rights	-3,256	-329
Stock-Based Compensation Expense	2,042	246
Loss on Impairment of Property and Equipment	322	299
Class Action Settlement Liability	-2,000	9,739
Purchase of Loans Held for Sale at Fair Value	-1,416,809	-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625	181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145	-21,205
Accounts Receivable	-2,856	-256
Prepaid and Other Assets	-2,840	-320
Accounts Payable and Accrued Liabilities	11,844	-769
Payable to Investors	26,219	21,028
Net cash provided by (used in) Operating Activities	-2,900	-21,652
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088	-169,859
Principal Payments of Borrower Loans Held at Fair Value	121,082	90,054
Purchases of Property and Equipment	-12,267	-2,714
Changes in Restricted Cash Related to Investing Activities	-5,081	-7,685
Net Cash Used in Investing Activities	-73,357	-88,856
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865	170,586
Payment of Notes Held at Fair Value	-120,909	-89,681
Net Cash Provided by Financing Activities	108,475	126,547
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	41,053	35,027
Prosper Funding LLC [Member]
Cash Flows from Operating Activities:
Net Income (Loss)	13,284	3,593
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868	10,632
Change in Fair Value of Loans Held For Sale	-73	-44
Change in Fair Value of Notes	-16,391	-11,380
Depreciation and Amortization	1,331	671
Change in Servicing Rights	-3,440	-292
Purchase of Loans Held for Sale at Fair Value	-1,416,809	-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625	181,645
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145	-17,446
Accounts Payable and Accrued Liabilities	495	107
Payable to Investors	25,538	19,925
Other Assets	3	-8
Net Related Party Payable	-1,340	205
Change in Fair Value of Borrower Loans Receivable		10,632
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088	-160,037
Principal Payments of Borrower Loans Held at Fair Value	121,081	83,677
Maturities of Short Term Investments	-1,274
Purchases of Short Term Investments	1,271
Changes in Restricted Cash Related to Investing Activities	-58	-8,576
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865	160,764
Payment of Notes Held at Fair Value	-120,909	-82,924
Net Increase (Decrease) in Cash and Cash Equivalents	17,988	5,784
Cash and Cash Equivalents at Beginning of the Year	5,789	5
Cash and Cash Equivalents at End of the Year	23,777	5,789
Cash Paid for Interest	41,053	32,154
Cash Flows from Operating Activities:
Net Income (Loss)	13,284	3,593
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans	15,868	10,632
Change in Fair Value of Loans Held For Sale	-73	-44
Change in Fair Value of Notes	-16,391	-11,380
Depreciation and Amortization	1,331	671
Change in Servicing Rights	-3,440	-292
Purchase of Loans Held for Sale at Fair Value	-1,416,809	-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value	1,411,625	181,645
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities	-26,145	-17,446
Accounts Payable and Accrued Liabilities	495	107
Payable to Investors	25,538	19,925
Other Assets	3	-8
Net Related Party Payable	-1,340	205
Change in Fair Value of Borrower Loans Receivable		10,632
Net cash provided by (used in) Operating Activities	3,946	2,801
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	-177,088	-160,037
Principal Payments of Borrower Loans Held at Fair Value	121,081	83,677
Purchases of Property and Equipment	-846	-1,797
Changes in Restricted Cash Related to Investing Activities	-58	-8,576
Net Cash Used in Investing Activities	-56,914	-86,733
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	176,865	160,764
Payment of Notes Held at Fair Value	-120,909	-82,924
Memberâ€™s Equity Capital Infusion from Parent	15,000	10,001
Net Cash Included in Transfer of Assets from Parent		1,875
Net Cash Provided by Financing Activities	70,956	89,716
Supplemental Disclosure of Cash Flow Information:
Restricted Cash		20,628
Short Term Investments		1,271
Borrower Loans at Fair Value		167,376
Property and Equipment, net		484
Accrued Liabilities		-131
Payable to Investors		-18,096
Notes at Fair Value		-167,758
Non-Cash Transfer		3,774
Cash Transferred		1,875
Total Transfer of Net Non-Cash Assets from PMI		5,649
Cash Paid for Interest	41,053	32,154
Non-Cash Financing Activity, Distribution to Parent	1,228	24
Previously Stated [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		-27,181
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans		4,856
Change in Fair Value of Loans Held For Sale		1
Change in Fair Value of Notes		-5,734
Depreciation and Amortization		961
Stock-Based Compensation Expense		229
Loss on Impairment of Property and Equipment		62
Class Action Settlement Liability		10,000
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-9,524
Accounts Receivable		-126
Prepaid and Other Assets		-332
Accounts Payable and Accrued Liabilities		1,962
Net cash used in Operating Activities		-24,826
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		-341,176
Principal Payments of Borrower Loans Held at Fair Value		105,692
Proceeds from Sale of Borrower Loans Held at Fair Value		171,290
Purchases of Property and Equipment		-2,889
Maturities of Short Term Investments		1,000
Repayment of Loans Held for Investment at Fair Value		143
Origination of Loans Held for Investment at Fair Value		-14,296
Proceeds from sale of Borrower Loans at Fair Value		10,410
Net Cash Used in Investing Activities		-69,826
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		169,742
Payment of Notes Held at Fair Value		-104,692
Proceeds from Issuance of Convertible Preferred Stock, Net		44,822
Proceeds from Early Exercise of Stock Options		650
Repurchase of Restricted Stock		-41
Proceeds from Exercise of Vested Stock Options		210
Net Cash Provided by Financing Activities		110,691
Net Increase (Decrease) in Cash and Cash Equivalents		16,039
Cash and Cash Equivalents at Beginning of the Year	18,339	2,300
Cash and Cash Equivalents at End of the Year		18,339
Cash Flows from Operating Activities:
Net Income (Loss)		-27,181
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans		4,856
Change in Fair Value of Loans Held For Sale		1
Change in Fair Value of Notes		-5,734
Depreciation and Amortization		961
Stock-Based Compensation Expense		229
Loss on Impairment of Property and Equipment		62
Class Action Settlement Liability		10,000
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-9,524
Accounts Receivable		-126
Prepaid and Other Assets		-332
Accounts Payable and Accrued Liabilities		1,962
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		-341,176
Principal Payments of Borrower Loans Held at Fair Value		105,692
Repayment of Loans Held for Investment at Fair Value		143
Origination of Loans Held for Investment at Fair Value		-14,296
Proceeds from sale of Borrower Loans at Fair Value		10,410
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		169,742
Payment of Notes Held at Fair Value		-104,692
Previously Stated [Member] \| Prosper Funding LLC [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		3,623
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Loans Held For Sale		1
Change in Fair Value of Notes		-5,734
Depreciation and Amortization		538
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-8,155
Accounts Payable and Accrued Liabilities		2,924
Other Assets		-13
Net Related Party Payable		205
Change in Fair Value of Borrower Loans Receivable		4,856
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		-331,353
Principal Payments of Borrower Loans Held at Fair Value		171,290
Repayment of Loans Held for Investment at Fair Value		143
Origination of Loans Held for Investment at Fair Value		-14,296
Proceeds from sale of Borrower Loans at Fair Value		10,410
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		159,921
Payment of Notes Held at Fair Value		-97,967
Net Increase (Decrease) in Cash and Cash Equivalents		5,784
Cash and Cash Equivalents at Beginning of the Year	5,789	5
Cash and Cash Equivalents at End of the Year		5,789
Cash Flows from Operating Activities:
Net Income (Loss)		3,623
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Loans Held For Sale		1
Change in Fair Value of Notes		-5,734
Depreciation and Amortization		538
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-8,155
Accounts Payable and Accrued Liabilities		2,924
Other Assets		-13
Net Related Party Payable		205
Change in Fair Value of Borrower Loans Receivable		4,856
Net cash provided by (used in) Operating Activities		-1,755
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		-331,353
Principle Payment of Borrower Loans Receivable Held at Fair Value		99,313
Principal Payments of Borrower Loans Held at Fair Value		171,290
Repayment of Loans Held for Investment at Fair Value		143
Origination of Loans Held for Investment at Fair Value		-14,296
Proceeds from sale of Borrower Loans at Fair Value		10,410
Purchases of Property and Equipment		-1,798
Net Cash Used in Investing Activities		-66,291
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		159,921
Payment of Notes Held at Fair Value		-97,967
Memberâ€™s Equity Capital Infusion from Parent		10,001
Net Cash Included in Transfer of Assets from Parent		1,875
Net Cash Provided by Financing Activities		73,830
Supplemental Disclosure of Cash Flow Information:
Restricted Cash		4,144
Borrower Loans at Fair Value		170,518
Property and Equipment, net		721
Accrued Liabilities		-820
Notes at Fair Value		-170,573
Non-Cash Transfer		3,990
Cash Transferred		1,875
Total Transfer of Net Non-Cash Assets from PMI		5,865
Adjustment [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		174
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans		5,705
Change in Fair Value of Loans Held For Sale		-56
Change in Fair Value of Notes		-5,793
Depreciation and Amortization		133
Change in Servicing Rights		-329
Stock-Based Compensation Expense		17
Loss on Impairment of Property and Equipment		237
Class Action Settlement Liability		-261
Purchase of Loans Held for Sale at Fair Value		-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value		181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-11,681
Accounts Receivable		-130
Prepaid and Other Assets		12
Accounts Payable and Accrued Liabilities		-2,731
Payable to Investors		21,028
Net cash used in Operating Activities		3,174
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		171,317
Principal Payments of Borrower Loans Held at Fair Value		-15,638
Proceeds from Sale of Borrower Loans Held at Fair Value		-171,290
Purchases of Property and Equipment		175
Maturities of Short Term Investments		1,619
Purchases of Short Term Investments		-1,271
Repayment of Loans Held for Investment at Fair Value		-143
Origination of Loans Held for Investment at Fair Value		14,296
Proceeds from sale of Borrower Loans at Fair Value		-10,410
Changes in Restricted Cash Related to Investing Activities		-7,685
Net Cash Used in Investing Activities		-19,030
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		844
Payment of Notes Held at Fair Value		15,011
Proceeds from Early Exercise of Stock Options		44
Repurchase of Restricted Stock		-45
Proceeds from Exercise of Vested Stock Options		2
Net Cash Provided by Financing Activities		15,856
Cash Paid for Interest		35,027
Non-Cash Investing Activity- Accrual for Property and Equipment, Net		175
Cash Flows from Operating Activities:
Net Income (Loss)		174
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans		5,705
Change in Fair Value of Loans Held For Sale		-56
Change in Fair Value of Notes		-5,793
Depreciation and Amortization		133
Change in Servicing Rights		-329
Stock-Based Compensation Expense		17
Loss on Impairment of Property and Equipment		237
Class Action Settlement Liability		-261
Purchase of Loans Held for Sale at Fair Value		-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value		181,656
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-11,681
Accounts Receivable		-130
Prepaid and Other Assets		12
Accounts Payable and Accrued Liabilities		-2,731
Payable to Investors		21,028
Net cash provided by (used in) Operating Activities		-3,100
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		171,317
Principal Payments of Borrower Loans Held at Fair Value		-15,638
Repayment of Loans Held for Investment at Fair Value		-143
Origination of Loans Held for Investment at Fair Value		14,296
Proceeds from sale of Borrower Loans at Fair Value		-10,410
Changes in Restricted Cash Related to Investing Activities		-7,685
Net Cash Used in Investing Activities		19,000
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		844
Payment of Notes Held at Fair Value		15,011
Net Cash Provided by Financing Activities		-15,900
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest		35,027
Adjustment [Member] \| Prosper Funding LLC [Member]
Cash Flows from Operating Activities:
Net Income (Loss)		-30
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Loans Held For Sale		-45
Change in Fair Value of Notes		-5,646
Depreciation and Amortization		133
Change in Servicing Rights		-292
Purchase of Loans Held for Sale at Fair Value		-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value		181,645
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-9,291
Accounts Payable and Accrued Liabilities		-2,817
Payable to Investors		19,925
Other Assets		5
Change in Fair Value of Borrower Loans Receivable		5,776
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		171,316
Principal Payments of Borrower Loans Held at Fair Value		-87,613
Repayment of Loans Held for Investment at Fair Value		-143
Origination of Loans Held for Investment at Fair Value		14,296
Proceeds from sale of Borrower Loans at Fair Value		-10,410
Changes in Restricted Cash Related to Investing Activities		-8,576
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		843
Payment of Notes Held at Fair Value		15,043
Cash Paid for Interest		32,154
Cash Flows from Operating Activities:
Net Income (Loss)		-30
Adjustments to Reconcile Net Loss to Net Cash Used in Operating Activities:
Change in Fair Value of Loans Held For Sale		-45
Change in Fair Value of Notes		-5,646
Depreciation and Amortization		133
Change in Servicing Rights		-292
Purchase of Loans Held for Sale at Fair Value		-184,807
Proceeds From Sales of Loans Held for Sale at Fair Value		181,645
Changes in Operating Assets and Liabilities:
Restricted Cash Except for those Related to Investing Activities		-9,291
Accounts Payable and Accrued Liabilities		-2,817
Payable to Investors		19,925
Other Assets		5
Change in Fair Value of Borrower Loans Receivable		5,776
Net cash provided by (used in) Operating Activities		4,556
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value		171,316
Principle Payment of Borrower Loans Receivable Held at Fair Value		-99,313
Principal Payments of Borrower Loans Held at Fair Value		-87,613
Repayment of Loans Held for Investment at Fair Value		-143
Origination of Loans Held for Investment at Fair Value		14,296
Proceeds from sale of Borrower Loans at Fair Value		-10,410
Purchases of Property and Equipment		1
Changes in Restricted Cash Related to Investing Activities		-8,576
Net Cash Used in Investing Activities		-20,442
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value		843
Payment of Notes Held at Fair Value		15,043
Net Cash Provided by Financing Activities		15,886
Supplemental Disclosure of Cash Flow Information:
Restricted Cash		16,484
Short Term Investments		1,271
Borrower Loans at Fair Value		-3,142
Property and Equipment, net		-237
Accrued Liabilities		689
Payable to Investors		-18,096
Notes at Fair Value		2,815
Non-Cash Transfer		-216
Total Transfer of Net Non-Cash Assets from PMI		-213
Cash Paid for Interest		32,154
Non-Cash Financing Activity, Distribution to Parent		$24

Quarterly_Financial_Informatio2

Quarterly Financial Information (Unaudited) - Additional Information (Details) (USD $)	3 Months Ended							12 Months Ended
	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2013
Quarterly Financial Information Disclosure [Abstract]
Reclassification, Convertible Preferred Stock to Temporary Equity	$0	$114,800,000	$44,900,000	$44,900,000	$44,900,000	$19,900,000	$19,900,000	$44,800,000

Quarterly_Financial_Informatio3

Quarterly Financial Information (Unaudited) - Schedule of Quarterly Financial Information (Details) (USD $)	3 Months Ended							12 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information [Line Items]
Operating Revenues	$24,209	$17,387	$9,229	$7,277	$4,516	$3,338	$1,395	$77,836	$16,526
Net Revenues	25,125	18,293	9,979	8,090	4,769	3,760	1,762	81,317	18,381
Total Expenses	21,781	17,579	12,697	10,419	9,681	19,355	5,932	83,986	45,388
Net Income (Loss)	3,344	714	-2,718	-2,329	-4,912	-15,596	-4,170	-2,669	-27,007
Basic and diluted net loss per share (in dollars per share)	($1.24)	$0.08	($0.40)		($0.72)	($2.38)	($0.76)	($1.97)	($4.09)
Weighted-Average Shares - Basic and Diluted Net Loss Per Share	9,280,334	9,155,199	6,868,153		6,868,153	6,553,785	5,480,850	8,896,801	6,596,827
Prosper Funding LLC [Member]
Quarterly Financial Information [Line Items]
Operating Revenues	11,067	8,280	4,775	3,809	2,288	1,532	607	36,420	8,237
Net Revenues	12,062	9,288	5,644	4,783	2,776	2,273	1,103	40,265	10,935
Total Expenses	7,808	5,976	3,996	3,142	2,109	1,227	864	26,981	7,342
Net Income (Loss)	4,254	3,312	1,648	1,641	667	1,046	239	13,284	3,593
As previously reported [Member]
Quarterly Financial Information [Line Items]
Total Revenues		17,285	9,876		4,542	3,405	1,703
Operating Revenues	25,129								14,937
Cost of Revenues		821	587		450	550	609
Net Revenues	26,043	16,464	9,289		4,092	2,855	1,094		18,268
Total Expenses	23,319	16,559	11,754		9,467	19,030	5,610		44,429
Other Income (Expenses), Net		92	299		412	522	317
Other income									1,151
Net Income (Loss)	2,724	-3	-2,166		-4,963	-15,653	-4,199		-27,181
Basic and diluted net loss per share (in dollars per share)	($1.31)		($0.32)		($0.72)	($2.39)	($0.77)
Weighted-Average Shares - Basic and Diluted Net Loss Per Share	9,280,334	9,155,199	6,868,153		6,927,648	6,553,785	5,480,850
As previously reported [Member] \| Prosper Funding LLC [Member]
Quarterly Financial Information [Line Items]
Total Revenues		7,766	5,197		2,646	1,978	861
Operating Revenues									7,632
Cost of Revenues		710	459		291	388	324
Net Revenues		7,056	4,738		2,355	1,590	537		10,807
Total Expenses		4,564	2,941		1,738	810	525		5,859
Other income		92	291		33	298	175		28
Net Income (Loss)		2,584	2,088		650	1,078	187		3,623
Reclassifications [Member]
Quarterly Financial Information [Line Items]
Total Revenues		-17,285	-9,876		-4,542	-3,405	-1,703
Operating Revenues		16,371	9,265		4,405	3,257	1,443
Cost of Revenues		-821	-587		-450	-550	-609
Net Revenues		913	886		862	1,133	927
Total Expenses		823	587		450	611	610
Other Income (Expenses), Net		-92	-299		-412	-522	-317
Net Income (Loss)		-2
Basic and diluted net loss per share (in dollars per share)						$0
Reclassifications [Member] \| Prosper Funding LLC [Member]
Quarterly Financial Information [Line Items]
Total Revenues		-7,766	-5,197		-2,646	-1,978	-861
Operating Revenues		6,852	4,579		2,131	1,546	607
Cost of Revenues		-710	-459		-291	-388	-324
Net Revenues		802	750		324	686	499
Total Expenses		710	459		291	388	324
Other income		-92	-291		-33	-298	-175
As Reclassified
Quarterly Financial Information [Line Items]
Operating Revenues	25,129	16,371	9,265	7,476	4,405	3,257	1,443		16,582
Net Revenues	26,043	17,377	10,175	8,460	4,954	3,988	2,021		19,422
Total Expenses	23,319	17,382	12,341	10,824	9,917	19,641	6,220		46,603
Net Income (Loss)	2,724	-5	-2,166	-2,364	-4,963	-15,653	-4,199		-27,181
Basic and diluted net loss per share (in dollars per share)	($1.31)		($0.32)		($0.72)	($2.39)	($0.77)
Weighted-Average Shares - Basic and Diluted Net Loss Per Share	9,280,334	9,155,199	6,868,153		6,868,153	6,553,785	5,480,850
As Reclassified \| Prosper Funding LLC [Member]
Quarterly Financial Information [Line Items]
Operating Revenues	10,783	6,852	4,579	3,859	2,131	1,546	607		8,057
Net Revenues	11,716	7,858	5,488	4,797	2,679	2,276	1,036		10,835
Total Expenses	8,196	5,274	3,400	3,118	2,029	1,198	849		7,212
Net Income (Loss)	3,520	2,584	2,088	1,679	650	1,078	187		3,623
Adjustment [Member]
Quarterly Financial Information [Line Items]
Operating Revenues	-920	1,016	-36	-199	111	81	-48		-56
Net Revenues	-918	916	-196	-370	-185	-228	-259		-1,041
Total Expenses	-1,538	197	356	-405	-236	-286	-288		-1,215
Net Income (Loss)	620	719	-552	35	51	57	29		174
Basic and diluted net loss per share (in dollars per share)	$0.07	$0.08	($0.08)		$0	$0.01	$0.01
Adjustment [Member] \| Prosper Funding LLC [Member]
Quarterly Financial Information [Line Items]
Operating Revenues	284	1,428	196	-50	157	-14			180
Net Revenues	346	1,430	156	-14	97	-3	67		100
Total Expenses	-388	702	596	24	80	29	15		130
Net Income (Loss)	$734	$728	($440)	($38)	$17	($32)	$52		($30)

Subsequent_Events_Details

Subsequent Events (Details) (Subsequent Event [Member], USD $)	0 Months Ended
In Millions, unless otherwise specified	Jan. 23, 2015
Subsequent Event [Member]
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross	$21
Business Acquisition, Effective Date of Acquisition	23-Jan-15
Business Acquisition, Name of Acquired Entity	American HealthCare Lending LLC

Related_Parties_Aggregate_Amou1

Related Parties - Aggregate Amount of Loans Purchased and the Income Earned (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	$1,169	$1,823
Interest earned on Notes	173	64
Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	1,127	1,096
Interest earned on Notes	163	12
Directors [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	42	727
Interest earned on Notes	10	52
Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	1,127	1,170
Interest earned on Notes	159	1
Prosper Funding LLC [Member] \| Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	1,127	1,170
Interest earned on Notes	$159	$1

Related_Parties_Aggregate_Amou2

Related Parties - Aggregate Amount of Notes and Borrowed Loans Purchased and the Income Earned (Details) (USD $)	Dec. 31, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Related Party Transaction [Line Items]
Notes balance	$1,690	$1,389
Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Notes balance	1,614	1,067
Directors [Member]
Related Party Transaction [Line Items]
Notes balance	76	322
Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Notes balance	1,614	1,065
Prosper Funding LLC [Member] \| Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Notes balance	$1,614	$1,065