Prosper Funding 10-K 31 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 13, 2014	Jun. 30, 2013
Entity Information [Line Items]	'	'	'
Entity Registrant Name	'PROSPER MARKETPLACE INC	'	'
Entity Central Index Key	'0001416265	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Voluntary Filers	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Filer Category	'Smaller Reporting Company	'	'
Entity Public Float	'	'	$924,012
Entity Common Stock, Shares Outstanding	'	13,405,113	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Prosper Funding LLC [Member]	'	'	'
Entity Information [Line Items]	'	'	'
Entity Registrant Name	'Prosper Funding LLC	'	'
Entity Central Index Key	'0001542574	'	'
Current Fiscal Year End Date	'--12-31	'	'
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, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and cash equivalents	$18,339	$2,300
Restricted cash	15,473	5,949
Short term investments	0	1,000
Accounts receivable	218	92
Loans held for investment	3,917	175
Borrower loans receivable at fair value	226,238	166,900
Property and equipment, net	3,396	1,530
Prepaid and other assets	708	376
Total Assets	268,289	178,322
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'
Accounts payable and accrued liabilities	6,737	4,766
Class action settlement liability	10,000	0
Notes at fair value	226,794	167,478
Repurchase liability for unvested restricted stock awards	609	0
Repurchase and indemnification obligation	32	41
Total Liabilities	244,172	172,285
Commitments and contingencies (see Note 12)	'	'
Stockholders' Equity	'	'
Convertible preferred stock	0	72
Common stock --$0.01 par value; 41,487,465 shares authorized; 13,720,,214 shares issued and outstanding as of December 31, 2013; 8,263,000 shares authorized; 300,674 issued and outstanding as of December 31, 2012	75	5
Additional paid-in capital	128,140	83,150
Less: treasury stock	-291	-291
Accumulated deficit	-104,080	-76,899
Total stockholders' equity	24,117	6,037
Total Liabilities and Stockholders' Equity	268,289	178,322
Series A '13 Preferred Stock [Member]	'	'
Stockholders' Equity	'	'
Convertible preferred stock	$273	$0

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parenthetical) (USD $)	2 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Stockholders' Equity	'	'
Convertible preferred stock, par value (in dollars per share)	$0.01	$0.01
Convertible preferred stock, shares authorized (in shares)	7,195,813	7,195,813
Convertible preferred stock, shares issued (in shares)	7,195,813	7,195,813
Convertible preferred stock, shares outstanding (in shares)	7,195,813	7,195,813
Convertible preferred stock, aggregate liquidation preference	$51,172	$0
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized (in shares)	41,487,465	8,263,000
Common stock, shares issued (in shares)	13,720,214	300,674
Common stock, shares outstanding (in shares)	13,720,214	300,674
Reverse stock split, shares issued (in shares)	1	'
Reverse stock split, shares converted (in shares)	10	'
Series A '13 Preferred Stock [Member]	'	'
Stockholders' Equity	'	'
Convertible preferred stock, par value (in dollars per share)	$0.01	$0.01
Convertible preferred stock, shares authorized (in shares)	27,274,068	0
Convertible preferred stock, shares issued (in shares)	27,274,068	0
Convertible preferred stock, shares outstanding (in shares)	27,274,068	0
Convertible preferred stock, aggregate liquidation preference	$96,172	$0

Consolidated_Statements_of_Ope

Consolidated Statements of Operations (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Revenues	'	'
Origination fees	$16,471	$6,918
Interest income on borrower loans	35,526	23,101
Interest expense on payment dependent notes	-33,072	-21,889
Rebates and promotions	-1,534	-1,322
Total Revenues	17,391	6,808
Cost of revenues	'	'
Cost of services	-2,056	-1,421
Provision for repurchase indemnification obligation	-118	-26
Net revenues	15,217	5,361
Operating expenses	'	'
Compensation and benefits	13,079	10,334
Marketing and advertising	14,851	5,683
Depreciation and amortization	961	679
Professional services	1,979	3,307
Facilities and maintenance	1,764	1,228
Class action settlement	10,000	0
Loss on impairment of fixed assets	62	0
Other	1,733	1,580
Total Expenses	44,429	22,811
Loss Before Other Income and Expenses	-29,212	-17,450
Other Income and Expenses	'	'
Interest income	3	14
Change in fair value on borrower loans, loans held for Investment and notes, net	877	957
Other income	1,151	369
Total Other Income and Expenses	2,031	1,340
Loss Before Income Taxes	-27,181	-16,110
Provision for income taxes	0	0
Net Loss	($27,181)	($16,110)
Net loss per share - basic and diluted (in dollars per share)	($4.14)	($5.51)
Weighted - average shares - basic and diluted net loss per share (in shares)	6,567,201	2,925,611

Consolidated_Statements_of_Ope1

Consolidated Statements of Operations (Parenthetical)	2 Months Ended
	Dec. 31, 2013
Reverse Stock Split [Abstract]	'
Reverse stock split, shares issued (in shares)	1
Reverse stock split, shares converted (in shares)	10

Consolidated_Statements_of_Sto

Consolidated Statements of Stockholders' Equity (USD $)	Preferred Stock [Member]	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Accumulated Deficit [Member]	Total
In Thousands, except Share data
Balance at Dec. 31, 2010	'	'	'	'	'	'
Exercise of vested stock options	'	'	'	$19	$0	$19
Balance at Dec. 31, 2011	72	5	-291	82,733	-60,789	21,730
Balance (in shares) at Dec. 31, 2011	7,195,813	469,550	-182,264	'	'	'
Exercise of vested stock options	0	0	0	202	0	210
Exercise of vested stock options (in shares)	0	13,388	0	'	'	'
Exercise of nonvested stock options	0	0	0	0	0	0
Exercise of nonvested stock options (in shares)	0	0	0	'	'	'
Repurchase of restricted stock	0	0	0	0	0	0
Repurchase of restricted stock (in shares)	0	0	0	'	'	'
Issuance of common stock warrants	0	0	0	58	0	58
Stock-based compensation expense	0	0	0	340	0	340
Net loss	0	0	0	'	-16,110	-16,110
Balance at Dec. 31, 2012	72	5	-291	83,150	-76,899	6,037
Balance (in shares) at Dec. 31, 2012	7,195,813	482,938	-182,264	'	'	'
Issuance of convertible preferred stock, Series A'13, net of issuance costs	139	0	0	19,702	0	19,841
Issuance of convertible preferred stock, Series A'13, net of issuance costs (in shares)	13,868,152	0	0	'	'	'
Issuance of convertible preferred stock, Series A-1'13	51	0	0	0	0	51
Issuance of convertible preferred stock, Series A-1'13 (in shares)	5,117,182	0	0	'	'	'
Issuance of convertible preferred stock, Series B'13, net of issuance costs	83	0	0	24,847	0	24,930
Issuance of convertible preferred stock, Series B'13, net of issuance costs (in shares)	8,288,734	0	0	'	'	'
Conversion of Preferred Series A-F	-72	62	0	10	'	0
Conversion of Preferred Series A-F (in shares)	-7,195,813	6,191,270	0	'	'	'
Exercise of vested stock options	0	8	'	'	'	'
Exercise of vested stock options (in shares)	0	828,496	'	'	'	'
Exercise of nonvested stock options (in shares)	0	6,499,463	'	'	'	'
Repurchase of restricted stock (in shares)	0	-100,509	0	'	'	'
Cashless exercise of common stock warrants (in shares)	0	820	0	'	'	'
Stock-based compensation expense	0	0	0	229	0	229
Net loss	0	0	0	0	-27,181	-27,181
Balance at Dec. 31, 2013	$273	$75	($291)	$128,140	($104,080)	$24,117
Balance (in shares) at Dec. 31, 2013	27,274,068	13,902,478	-182,264	'	'	'

Consolidated_Statements_of_Sto1

Consolidated Statements of Stockholders' Equity (Parenthetical)	2 Months Ended
	Dec. 31, 2013
Reverse Stock Split [Abstract]	'
Reverse stock split, shares issued (in shares)	1
Reverse stock split, shares converted (in shares)	10

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Cash flows from Operating Activities:	'	'
Net loss	($27,181)	($16,110)
Adjustments to reconcile net loss to net cash used in operating activities:	'	'
Change in fair value of borrower loans	4,856	-4,801
Change in fair value of notes	-5,734	3,833
Depreciation and amortization	961	679
Provision for repurchase and indemnification obligation	-9	19
Stock-based compensation expense	229	340
Loss on impairment of fixed assets	62	0
Change in fair value of loans held for investment	1	11
Issuance of common stock warrants	0	58
Changes in operating assets and liabilities:	'	'
Restricted cash	-9,524	-1,585
Accounts receivable	-126	-79
Prepaid and other assets	-332	-142
Accounts payable and accrued liabilities	1,971	1,615
Class action settlement liability	10,000	0
Net cash used in operating activities	-24,826	-16,162
Cash Flows from Investing Activities:	'	'
Origination of borrower loans held at fair value	-341,176	-153,175
Repayment of borrower loans held at fair value	105,692	66,840
Proceeds from sale of borrower loans held at fair value	171,290	0
Purchases of property and equipment	-2,889	-872
Maturities of short term investments	1,000	11,998
Repayment of loans held for investment at fair value	143	133
Origination of loans held for investment at fair value	-14,296	-182
Proceeds from sale of borrower loans held at fair value	10,410	0
Purchases of short-term investments	0	-3,000
Net cash used in investing activities	-69,826	-78,258
Cash Flows from Financing Activities:	'	'
Proceeds from issuance of notes held at fair value	169,742	153,175
Payment of notes held at fair value	-104,692	-65,690
Proceeds from issuance of convertible preferred stock	45,000	0
Proceeds from early exercise of stock options	650	0
Purchase of restricted stock from stockholders	-41	0
Proceeds from exercise of vested stock options	210	19
Issuance costs of convertible preferred stock	-178	0
Net cash provided by financing activities	110,691	87,504
Net increase (decrease) in cash and cash equivalents	16,039	-6,916
Cash and cash equivalents at beginning of the year	2,300	9,216
Cash and cash equivalents at end of the year	$18,339	$2,300

Organization_and_Business

Organization and Business	12 Months Ended
	Dec. 31, 2013
Organization and Business [Abstract]	'
Organization and Business	'
	1.      Organization and Business
	Prosper Marketplace, Inc. (“PMI” or the “Company”) was incorporated in the state of Delaware on March 22, 2005.   PMI developed a platform (the “platform”) and prior to February 1, 2013, owned the proprietary technology that made operation of the platform possible, operated the platform, facilitated the origination of unsecured, consumer loans by WebBank, an FDIC-insured, Utah-chartered industrial bank, through the platform and issued and sold borrower payment dependent notes corresponding to those loans. On February 1, 2013, PMI transferred ownership of the platform, including all of the rights related to the operation of the platform, as well as all then-outstanding Borrower Loans, to its wholly-owned subsidiary, Prosper Funding (“Prosper Funding”). At that same time, Prosper Funding assumed all of PMI’s obligations with respect to all then-outstanding Notes.  Since February 1, 2013, all Notes issued and sold through the platform are issued and sold by Prosper Funding.  Pursuant to a Loan Account Program Agreement between PMI and WebBank, PMI manages the operation of the platform, 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 loans by WebBank. On February 1, 2013, Prosper Funding entered into an Administration Agreement with PMI in its capacity as licensee, corporate administrator, loan platform administrator and loan and note servicer, pursuant to which PMI provides certain back office support, loan platform administration and loan and note servicing to Prosper Funding.  In this Annual Report, any actions taken by PMI pursuant to the Loan Account Program Agreement or the Administration Agreement are described as actions taken by PMI, in spite of the fact that such actions are being taken by PMI on behalf of WebBank or Prosper Funding, respectively. In these notes to financial statements, the unsecured, consumer loans originated through the platform, which are referred to elsewhere in this Annual Report as “PMI Borrower Loans” and “Prosper Funding Borrower Loans”, are referred to collectively as “Borrower Loans”, and the borrower payment dependent notes issued through the platform, which are referred to elsewhere in this Annual Report as “PMI Notes” and “Prosper Funding Notes”, are referred to collectively as “Notes”.
	The platform is designed to allow people to invest money in people in an open transparent marketplace, with the aim of allowing both lender members and borrower members to profit financially as well as socially. The Company believes peer-to-peer 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 lender. The platform was launched to the public in 2006 and had attracted over two million members and facilitated over $801,000 in Borrower Loans as of December 31, 2013.
	As reflected in the accompanying consolidated financial statements, PMI has incurred net losses and negative cash flows from operations since inception, and has an accumulated deficit of $104,080 as of December 31, 2013. At December 31, 2013, PMI had $18,339 in cash and cash equivalents. Since its inception, PMI has financed its operations primarily through equity financing from various sources. PMI is dependent upon raising additional capital or debt financing to fund its current operating plan. Failure to obtain sufficient debt and equity financings and, ultimately, to achieve profitable operations and positive cash flows from operations could adversely affect PMI’s ability to achieve its business objectives and continue as a going concern. Further, there can be no assurances as to the availability or terms upon which the required financing and capital might be available. In January 2013, PMI issued and sold to investors 13,868,152 shares of new Series A preferred stock in a private placement at a purchase price of $1.44 per share for approximately $19,844, net of issuance costs. In connection with that sale, PMI issued 5,117,182 shares at par value $.01 per share, of Series A-1 convertible preferred stock to the holders of shares of PMI’s preferred stock that was outstanding immediately prior to the sale in consideration for such stockholders participating in the sale. In September 2013, PMI issued and sold to investors 8,288,784 shares of new Series B preferred stock in a private placement at a purchase price of $3.02 per share for approximately $24,880, net of issuance costs.  See Note 9, Stockholders’ Equity, for additional information.

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Summary of Significant Accounting Policies	'
	2.      Summary of Significant Accounting Policies
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts of PMI and its wholly owned subsidiary Prosper Funding. All intercompany balances and transactions between Prosper Funding and PMI have been eliminated in consolidation. PMI and Prosper Funding's financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).
	Use of Estimates
	The preparation of 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 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 borrower loans receivable and associated member payment dependent notes, valuation of servicing rights, valuation allowance on deferred tax assets, valuation and amortization periods of intangible assets, repurchase and idemnification obligation, stock-based compensation expense, and contingent liabilities. Estimates are based on historical experience and on various other assumptions that are  believed to be reasonable under the circumstances. Actual results could differ from those estimates.
	Certain Risks and Concentrations
	In the normal course of its business, PMI encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject PMI to significant concentrations of credit risk consist primarily of cash, cash equivalents, restricted cash and short term investments. PMI places cash, cash equivalents, restricted cash and short term investments 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.  PMI 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 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, PMI does not bear the risk on such Borrower Loan.
	PMI 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 PMI's consolidated financial position and results of operations (See Note 12—Commitments and Contingencies—Securities Law Compliance).
	Cash and Cash Equivalents
	PMI invests its excess cash primarily in highly liquid debt instruments of the U.S. government and its agencies. All highly liquid investments with stated maturities of three months or less from date of purchase are classified as cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking, money market and short-term certificate of deposit accounts.
	Restricted Cash
	Restricted cash consists primarily of cash deposits held as collateral as required for loan funding and servicing activities.
	Short Term Investments
	PMI's short term investments consists of highly liquid debt instruments of the U.S. government and its agencies with original maturity periods greater than three months and less than 12 months.  PMI had no short term investments as of the year ended December 31, 2013.
	Borrower Loans and Notes
	On July 13, 2009, PMI implemented the operating structure it employed through January 31, 2013 and began issuing Notes. That operating structure resulted in PMI purchasing loans from WebBank and holding the loans until maturity. PMI issued new securities, the Notes, to the winning lender members. PMI’s obligation to repay the Notes was conditioned upon the repayment of the associated Borrower Loan owned by PMI. As a result of those changes, PMI carried the Borrower Loans and the Notes on its balance sheet as assets and liabilities, respectively. In conjunction with that operating structure, PMI adopted the provisions of ASC Topic 825, Financial Instrument. 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. The fair value election, with respect to an item, may not be revoked once an election is made.
	In applying the provisions of ASC Topic 825, PMI recorded assets and liabilities measured using the fair value option in a way that separates these reported fair values from the carrying values of similar assets and liabilities measured with a different measurement attribute. PMI does not record a specific allowance account related to the Borrower Loans and Notes in which PMI has elected the fair value option, but rather estimates the fair value of the Borrower Loans and Notes using discounted cash flow methodologies adjusted for PMI’s historical payment, loss and recovery rates. An account is considered to be a loss, or charged-off, when it reaches more than 120 days past due. PMI has reported the aggregate fair value of the Borrower Loans and Notes as separate line items in the assets and liabilities sections of the accompanying balance sheets using the methods described in ASC Topic 820, Fair Value Measurements and Disclosures—See Fair Value Measurement.
	Member Loans Sold Directly to Third Party Purchasers
	For loans sold to unrelated third party purchasers on a servicing retained basis, a gain or loss is recorded on the sale date. In order to calculate the gain or loss, PMI first determines whether the terms of the servicing arrangement with the purchaser results in a net servicing asset (i.e., when contractual/expected servicing revenues adequately compensate PMI) or a net servicing liability (i.e., when contractual/expected servicing revenues do not adequately compensate PMI). When contractual/expected servicing revenues do not adequately compensate PMI, a portion of the gross proceeds of the loans sold on a servicing retained basis are allocated to the recording of a net servicing liability. Conversely, when contractual/expected servicing revenues provide more than adequate compensation to PMI, the excess servicing compensation is allocated to the gross proceeds of the loans sold and results in the recording of a net servicing asset.
	PMI estimates the fair value of the loan servicing asset or liability considering the contractual servicing fee revenue, adequate compensation for PMI's servicing obligation, the current principal balances of the loans and projected servicing revenues given projected defaults and prepayments (if significant) over the remaining lives of the loans. At December 31, 2013, PMI recorded $144 as a servicing asset related to these loans, which is included in Borrower Loans Receivable at fair value on the consolidated balance sheets.
	Loans held for investment
	Loans held for investment are primarily comprised of loans held for short durations and are recorded at cost which approximates fair value.
	Property and Equipment
	Property and equipment consists of computer equipment, office furniture and equipment, and software purchased or developed for internal use. Property and equipment are stated at cost, less accumulated depreciation and amortization. PMI capitalizes expenditures for replacements and betterments and recognizes as expenses amounts for maintenance and repairs as incurred.  Depreciation and amortization commences once the asset is placed in service. Depreciation and amortization are computed using the straight-line method based upon estimated useful lives of the assets as follows:
	Furniture and fixtures	7 years
	Office equipment	5 years
	Computers and equipment	3 years
	Leasehold improvements	3 years
	Software	3 years
	Earned Vacations
	The Company has a flexible vacation plan for its employees under which employees are entitled to take vacations for such periods of time that do not interfere with the orderly performance of their job responsibilities. Accordingly, no accrual for unpaid vacation pay has been included in the consolidated financial statements.
	Internal Use Software and Website Development
	PMI 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 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. PMI 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 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 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 asset.
	Impairment of Long-Lived Assets Including Acquired Intangible Assets
	In accordance with ASC Topic 360, Property Plant and Equipment, PMI reviews property and equipment and intangible assets for impairment whenever events or changes in circumstances indicate that the carrying values of those assets may not be recoverable.  Recoverability of assets to be held and used is measured by comparing the carrying value of the asset to future net undiscounted cash flows that the assets are expected to generate. If an asset is considered to be impaired, the impairment to be recognized equals the amount by which the asset’s carrying value exceeds its fair value. Fair value is estimated using discounted net cash flows.
	During 2013 management made the decision to discontinue the development of certain of its planned software development projects and to dispose of obsolete computer software and hardware. The assets PMI's capitalized in prior years were deemed to be impaired in accordance with ASC Topic 360, Property, Plant, and Equipment. An impairment charge for obsolete equipment of $62 is included in operating expenses in PMI's consolidated statement of operations for the year ended December 31, 2013.  During 2012, no asset disposals resulted in a loss on impairment of fixed assets.
	Repurchase and Indemnification Obligation
	PMI is obligated to indemnify lenders and repurchase certain Notes and member loans sold directly to third party purchasers in the event of violation of applicable federal, state, or local lending laws, or verifiable identify theft. The loan indemnification and repurchase obligation is estimated based on historical experience. PMI accrues a provision for the repurchase and indemnification obligation when the Notes or member loans are issued. Indemnified or repurchased Notes and member loans associated with federal, state, or local lending laws, or verifiable identity thefts are written off at the time of repurchase or at the time an indemnification payment is made.
	Revenue Recognition
	Revenue is recognized in accordance with ASC Topic 605, Revenue Recognition.  Under ASC Topic 605, PMI recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the price of the services is fixed and determinable, and collectability is reasonably assured.
	Origination fees
	The company earns an origination fee upon the successful closing of a loan. The borrower receives an amount equal to the loan amount net of the loan origination fee. The loan origination fee is determined by the term and credit grade of the loan, and ranges from 1.00% to 4.95% of the original principal amount. Since PMI accounts for borrower loans, loans held for investment and Notes at fair value, origination fees are not deferred but are recognized at origination of the loan, and direct costs to originate loans are recorded as expenses as incurred.
	Loan servicing fees
	Loan servicing revenue includes monthly loan servicing fees and non-sufficient funds (“NSF”) fees. Loan servicing fees are accrued daily based on the current outstanding loan principal balance of the Borrower Loans but are not recognized until payment is received due to the uncertainty of collection of borrower loan payments. NSF fees are charged to borrowers on the first failed payment of each billing period.  NSF fees are charged to the customer and collected and recognized immediately.
	Interest income on Borrower Loans Receivable and Interest Expense on Notes
	PMI recognizes interest income on Borrower Loans and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent PMI believes it to be collectable.  Below is a table which summarizes the gross interest income and expense for the twelve months ended December 31, 2013 and 2012.
			December 31,
			2013				2012
	Interest income on borrower loans		$	35,526			$	23,101
	Interest expense on notes			(33,072	)			(21,889	)
	Net interest income		$	2,454			$	1,212
	Marketing and Advertising Expense
	Under the provisions of ASC Topic 720, Other Expenses, the costs of advertising are expensed as incurred. Marketing and advertising costs were approximately $14,851 and $5,683 for the years ended December 31, 2013 and 2012, respectively.
	Rebate and Promotional Expenses
	PMI accounts for rebates and promotions in accordance with ASC Topic 605, Revenue Recognition.  From time to time PMI offers rebates and promotions to borrower and lender members.  PMI records these rebates and promotions as an offset to revenue if a particular rebate or promotion is earned upon origination of the loan. PMI's rebate and promotions have in the past been in the form of cash back and other incentives paid to lender and borrower members.
	Stock-Based Compensation
	PMI accounts for its stock-based compensation for employees using fair-value-based accounting in accordance with ASC Topic 718, Stock Compensation.  ASC Topic 718 requires companies to estimate the fair value of stock-based awards on the date of grant using an option-pricing model. The stock-based compensation related to awards that are expected to vest is amortized using the straight line method over the vesting term of the stock-based award, which is generally four years. Expected forfeitures of unvested options are estimated at the time of grant and reduce the recognized stock-based compensation expense. PMI estimated its annual forfeiture rate to be 17.2% and 18.2% for the years ended December 31, 2013 and 2012, respectively.
	PMI has granted options to purchase shares of common stock to nonemployees in exchange for services performed. PMI accounts for stock options and restricted stock issued to nonemployees in accordance with the provisions of ASC Topic 505-50, Equity-Based Payments to Non-Employees, which requires that equity awards be recorded at their fair value.  Under ASC Topic 718 and 505-50, PMI uses the Black-Scholes model to estimate the fair value of options granted to nonemployees at each vesting date until performance is complete to determine the appropriate charge for the services provided. The volatility of PMI's common stock was based on comparative company volatility.
	Total stock-based compensation expense for employees reflected in PMI's statements of operations for the years ended December 31, 2013 and 2012 is approximately $229 and $340, respectively.  As of December 31, 2013, the unamortized stock-based compensation expense related to unvested stock-based awards was approximately $991, which will be recognized over the remaining weighted average vesting period of approximately 4.2 years.
	Net Loss Per Share
	PMI computes net loss per share in accordance with ASC Topic 260 Earnings Per Share. Under ASC Topic 260, basic net loss per share is computed by dividing net loss per share available to common shareholders 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. At December 31, 2013, there were outstanding convertible preferred stock, warrants and options convertible into 27,274,068, 218,810 and 938,585 common shares, respectively, which may dilute future earnings per share. At December 31, 2012 there were outstanding convertible preferred stock, warrants and options convertible into 6,195,813, 260,987 and 1,173,816. Because PMI is reporting a net loss for the years ended December 31, 2013 and 2012, potentially dilutive securities are excluded from the computation of net loss per share, as their effect would be antidilutive.
Income Taxes
PMI uses the liability method to account for income taxes. Under this method, deferred income tax assets and liabilities are based on the differences between the financial statements 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.
Under ASC Topic 740, Income Taxes, PMI's policy to include interest and penalties related to gross unrecognized tax benefits within PMI's provision for income taxes did not change.
Fair Value Measurement
PMI adopted ASC Topic 820, Fair Value Measurements and Disclosures, on January 1, 2008. ASC Topic 820 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 but does not expand the use of fair value in any new circumstances.
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 while the cost basis of certain financial instruments may include initial 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 value of financial instruments 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, short term investments, Borrower Loans receivable, accounts payable and accrued liabilities, Notes and long-term debt.  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, 2013 and 2012:
31-Dec-13		Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
Assets
Borrower loans receivable		$	-			$	-		$	226,238		$	226,238
Certificates of deposit & restricted cash			14,032				1,441			-			15,473
Loans held for investment			-				-			3,917			3,917
Liabilities
Notes		$	-			$	-		$	226,794		$	226,794
31-Dec-12		Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
Assets
Short term investments		$	1,000			$	-		$	-		$	1,000
Certificates of deposit & restricted cash			4,331				1,618			-			5,949
Borrower loans receivable			-				-			166,900			166,900
Loans held for investment			-				-			175			175
Liabilities
Notes		$	-			$	-		$	167,478		$	167,478
Short term investments consist of United States Treasuries with maturity periods greater than three months and less than 12 months.  In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that PMI has the ability to access. PMI classifies United States Treasuries as Level 1 assets.  PMI intends to hold these investments until maturity.
As observable market prices are not available for the Borrower Loans and Notes, or for similar assets and liabilities, PMI believes the Borrower Loans and Notes should be considered Level 3 financial instruments under ASC Topic 820.  In a hypothetical transaction as of the measurement date, PMI believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which PMI 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, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, roll rates, recovery rates and discount rates based on the perceived credit risk within each credit grade.
The obligation to pay principal and interest on any group of Notes is equal to the loan payments, if any, that are received on the corresponding Borrower Loan, net of its 1.0% servicing fee.  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.  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 6 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.
Servicing rights related to Borrower Loans originated prior to October 16, 2008 do not trade in an active open market with readily observable prices. Although sales of servicing assets do occur, the nature and character of the assets underlying those transactions are not similar to those held by PMI and, therefore, the precise terms and conditions typically seen in the marketplace would likely not be available to PMI. Accordingly, management determined the fair value of its servicing rights using a discounted cash flow model to project future expected cash flows based upon a set of valuation assumptions PMI believes market participants would use for similar rights. The primary assumptions PMI uses for valuing its servicing asset include default rates, estimated servicing income, cost to service, profit margin, and discount rate.
PMI reviewed these assumptions to ensure they were consistent with market conditions. Inaccurate assumptions in valuing the servicing rights could affect PMI's results of operations. Due to the nature of the valuation inputs, servicing assets are classified as Level 3. The change in the fair-value of servicing rights is included in cost of services in the statement of operations. Servicing rights decreased to zero as loans originated prior to October 16, 2008 had fully matured or charged off as of December 31, 2013.
The changes in Level 3 assets measured at fair value on a recurring basis are as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes			Loans			Total
		Loans							Held for
									Investment
Balance at January 1, 2012		$	75,764			$	(76,160	)	$	137		$	(259	)
Originations			153,175				(153,175	)		182			182
Principal repayments			(66,840	)			65,690			(133	)		(1,283	)
Change in fair value on Borrower Loans and  Notes			4,801				(3,833	)		-			968
Change in fair value of Loans held for investment			-				-			(11	)		(11	)
Balance at December 31, 2012		$	166,900			$	(167,478	)	$	175		$	(403	)
Originations			341,176				(169,742	)		14,296			185,730
Principal repayments and credit losses			(105,692	)			104,692			(143	)		(1,143	)
Borrower Loans sold to third parties			(171,290	)			-			(10,410	)		(181,700	)
Change in fair value on Borrower Loans and  Notes			(4,856	)			5,734			-			878
Change in fair value of Loans held for investment			-				-			(1	)		(1	)
Balance at December 31, 2013		$	226,238			$	(226,794	)	$	3,917		$	3,361
The changes in fair value would directly impact the change in fair value on Borrower Loans, loans held for investment and Notes in the consolidated statements of operations.
Quantitative information about PMI's Level 3 fair value measurements of its Borrower Loans and Notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to PMI's fair value measurements.
Assets and Liabilities		Fair			Valuation		Unobservable Inputs
		Value as of			Technique
		31-Dec
Borrower loans receivable at fair value		$	226,238		Discounted Cashflow		Default rates and discount rates
Notes at fair value		$	(226,794	)	Discounted Cashflow		Default rates and discount rates

Cash_and_Cash_Equivalents_and_

Cash and Cash Equivalents and Short Term Investments	12 Months Ended
	Dec. 31, 2013
Cash and Cash Equivalents and Short Term Investments [Abstract]	'
Cash and Cash Equivalents and Short Term Investments	'
	3.      Cash and Cash Equivalents and Short Term Investments
	Cash and cash equivalents and short term investments consist of the following:
		December 31,
	Cash and cash equivalents and short term investments	2013		2012
	Cash	$	18,339	$	2,300
	Restricted cash		15,473		5,949
	Short term investments		-		1,000
	Total cash and cash equivalents and short term investments	$	33,812	$	9,249

Property_and_Equipment

Property and Equipment	12 Months Ended
	Dec. 31, 2013
Property and Equipment [Abstract]	'
Property and Equipment	'
	4.      Property and Equipment
	Property and equipment consist of the following:
		December 31,
		2013			2012
	Property and equipment:
	Computer equipment	$	2,115		$	1,630
	Internal-use software		3,454			1,656
	Purchased software		375			369
	Office equipment and furniture		39			125
	Leasehold improvements		-			41
	Assets not yet placed in service		651			134
	Property and equipment		6,634			3,955
	Less accumulated depreciation and amortization		(3,238	)		(2,425	)
	Total property and equipment, net	$	3,396		$	1,530
	Depreciation expense for 2013 and 2012 was $961 and $679, respectively. PMI capitalized internal-use software costs in the amount of $1,798 and $530 for the years ended December 31, 2013 and 2012, respectively.

Loans_Held_for_Investment

Loans Held for Investment	12 Months Ended
	Dec. 31, 2013
Loans Held for Investment [Abstract]	'
Loans Held for Investment	'
	5.      Loans Held for Investment
	During the year ended December 31, 2013, a total of $14,296 of Borrower Loans originated through the platform as Loans held for investment. During the year ended December 31, 2013, $10,410 of these loans were sold to an unrelated third party. The Company services the Borrower Loans that are sold to a third party. Loans held for investment on the consolidated balance sheets as of December 31, 2013 and 2012 was $3,917 and $175, respectively. When a Borrower Loan has been funded by PMI in whole, or in part, the portion of the borrower’s monthly loan payment that corresponds to the percentage of the Borrower Loan that is funded is retained. In these cases, interest income is recorded on these Borrower Loans.
	The fair value of the Borrower Loans held for investment is estimated using discounted cash flow methodologies based upon a set of valuation assumptions similar to those of Borrower Loans, which are set forth in Note 2, as they have similar characteristics and PMI expects these loans to behave in a comparable manner.  The valuation assumptions used to value these loans include prepayment rates, default rates and recovery rates derived from historical loan performance data and discount rates based on the credit grade applied to each loan.
	The fair value adjustment on these loans held for investment was $(1) and ($11), which is included in earnings for the year ended December 31, 2013 and 2012, respectively.  During the year ended December 31, 2013 and 2012, PMI has received $143 and $127 in payments on these loans.  During the year ended December 31, 2013 and 2012, there was $14 and $29 in loans held for investment that were charged-off.

Borrower_Loans_and_Notes_Held_

Borrower Loans and Notes Held at Fair Value	12 Months Ended
	Dec. 31, 2013
Borrower Loans and Notes Held at Fair Value [Abstract]	'
Borrower Loans and Notes Held at Fair Value	'
	6.      Borrower Loans and Notes Held at Fair Value
	The Company estimates the fair value of the Borrower Loans and Notes using discounted cash flow methodologies based upon a set of valuation assumptions. The primary assumptions used to value the Borrower Loans and Notes include default rates derived from historical performance and discount rates applied to each Prosper Rating tranche based on the perceived credit risk of each such Prosper Rating. If PMI does not receive payments on a Borrower Loan, PMI is not obligated to and does not make payments on the corresponding Notes. The aggregate fair value of a group of Notes corresponding to a particular Borrower Loan is approximately equal to the fair value of that Borrower Loan, adjusted for the 1.0% servicing fee and the timing of borrower payments subsequently disbursed to Note holders. The effective interest rate associated with the Notes is less than the interest rate earned on the corresponding Borrower Loan due to the 1.0% servicing fee.
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2013 for Borrower Loans and Notes are presented in the following table:
		Borrower Loans			Notes
	Discount rate assumption:		9.77	%*		9.77	%*
	Resulting fair value from:
	100 basis point increase	$	222,989		$	220,362
	200 basis point increase		220,363			217,756
	Resulting fair value from:
	100 basis point decrease	$	228,465		$	225,784
	200 basis point decrease		231,282			228,560
	Default rate assumption:		7.2	%*		7.2	%*
	Resulting fair value from:
	10% higher default rates	$	223,233		$	220,620
	20% higher default rates		220,039			217,439
	Increase in fair value  and income (loss) to earnings from:
	10% lower default rates	$	228,151		$	225,477
	20% lower default rates		230,554			227,866
	* Represents weighted average assumptions considering all Prosper Ratings.
	The changes in fair value would directly impact the change in fair value on loans, loans held for investment and Notes in the consolidated statements of operations.
	Due to the recent origination of the Borrower Loans and Notes, the change in fair value attributable to instrument-specific credit risk is immaterial.  Of the Borrower Loans originated from July 13, 2009 to December 31, 2013, 332 loans were 90 days or more delinquent for an aggregate principal amount of $1,941 and a fair value of $175 as of December 31, 2013.

Repurchase_and_Indemnification

Repurchase and Indemnification Obligation	12 Months Ended
	Dec. 31, 2013
Repurchase and Indemnification Obligation [Abstract]	'
Repurchase and Indemnification Obligation	'
	7.      Repurchase and Indemnification Obligation
	Changes in repurchase and indemnification obligations are summarized below:
		Years Ended December 31,
		2013			2012
	Beginning of year balance:	$	41		$	22
	Provision for repurchases and indemnifications		67			19
	Amounts repurchased and immediately charged off or charged off and indemnified (net of recoveries)		(76	)		-
	End of year balance:	$	32		$	41
	For the years ended December 31, 2013 and 2012, the provision for repurchase and indemnification obligation was $118 and $26, respectively.

Net_Loss_Per_Share

Net Loss Per Share	12 Months Ended
	Dec. 31, 2013
Net Loss Per Share [Abstract]	'
Net Loss Per Share	'
	8.      Net Loss Per Share
	PMI computes net loss per share in accordance with 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.
	The Company uses the two-class method to compute net loss per share because the Company has issued securities, other than common stock, that contractually entitle the holders to participate in dividends and earnings of the Company. The two-class method requires earnings for the period to be allocated between common stock and participating securities based upon their respective rights to receive distributed and undistributed earnings. Prior to their conversion to common shares, each series of the Company’s convertible preferred stock was entitled to participate on an as-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, 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.
	Under the two-class method, for periods with net income, basic net income per common share is computed by dividing the net income attributable to common stockholders by the weighted average number of shares of common stock outstanding during the period. Net income attributable to common stockholders is computed by subtracting from net income the portion of current year earnings that the participating securities would have been entitled to receive pursuant to their dividend rights had all of the year’s earnings been distributed. No such adjustment to earnings is made during periods with a net loss, as the holders of the participating securities have no obligation to fund losses. Diluted net loss per common share is computed under the two-class method by using the weighted average number of shares of common stock outstanding, plus, for periods with net income attributable to common stockholders, the potential dilutive effects of stock options and warrants. In addition, the Company analyzes the potential dilutive effect of the outstanding participating securities under the “if-converted” method when calculating diluted earnings per share, in which it is assumed that the outstanding participating securities convert into common stock at the beginning of the period. The Company reports the more dilutive of the approaches (two class or “if-converted”) as its diluted net income per share during the period. Due to net losses for the years ended December 31, 2013 and 2012, basic and diluted loss per share were the same, as the effect of potentially dilutive securities would have been anti-dilutive.
	Basic and diluted net loss per share was calculated as follows:
		Years Ended December 31,
		2013			2012
	Numerator:
	Net loss	$	(27,181	)	$	(16,110	)
	Denominator:
	Weighted average shares used in computing basic and diluted net loss per share		6,567,201			2,925,611
	Basic and diluted net loss per share	$	(4.14	)	$	(5.51	)
	Due to losses attributable to PMI'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:
		Years Ended December 31,
		2013			2012
	Excluded securities:	(shares)			(shares)
	Convertible preferred stock issued and outstanding		27,274,068			6,195,813
	Stock options issued and outstanding		938,585			1,173,817
	Unvested stock options exercised		6,499,463			-
	Warrants  issued and outstanding		218,810			260,987
	Total common stock equivalents excluded from diluted net loss per common share computation		34,930,926			7,630,617

Stockholders_Equity

Stockholders' Equity	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity [Abstract]	'
Stockholders' Equity	'
	9.      Stockholders’ Equity
	Preferred Stock
	Under PMI'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, PMI issued and sold to investors 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 approximately $19,844, net of issuance costs. In connection with that sale, PMI issued 5,117,182 shares at par value $.01 per share, of Series A-1 (“Series A-1”) convertible preferred stock to the holders of shares of PMI’s 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 PMI 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 PMI’s new Series A-1 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 $1.00 and converts into common stock at a ratio of 1,000,000:1.
	In September 2013, PMI issued and sold 8,288,734 shares of new Series B (“new Series B”) preferred stock in a private placement at a purchase price of $3.02 per share for approximately $24,880, net of issuance costs.
	Convertible Preferred Stock	Par Value		Authorized,		Balance		Liquidation
				Issued and		December		Preference
				Outstanding		31, 2013
				shares as of
				December 31,
				2013
	New Series A		0.01		13,868,152		139	$	20,000
	Series A-1		0.01		5,117,182		51		51,172
	New Series B		0.01		8,288,734		83		25,000
					27,274,068	$	273	$	96,172
	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 and new Series B 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 preferred stock and new Series B preferred stock have been paid or set aside for payment to the new Series A preferred stockholders and the new Series B 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. To date, no dividends have been declared on any of PMI’s preferred stock or common stock, and there are no dividends in arrears at December 31, 2013.
	The holders of Series D, Series E and Series F preferred stock were entitled to receive an annual dividend per share in an amount equal to 8% times the liquidation preference for such share, payable in preference and priority to any declaration or payment of any distribution on common stock in such calendar year. The right to receive dividends on shares of Series D, Series E and Series F preferred stock was cumulative from and after the date of issuance of such shares and were payable only when, as, and if declared by the board of directors. Holders of Series E-1 preferred stock were not entitled to receive dividends in preference and priority to, or on a pari passu basis with, the other preferred stock or the common stock. Dividends on shares of Series E-1 preferred stock were payable only when, as, and if declared by the board of directors. All shares of PMI’s Series D, E, E-1 and F preferred stock were converted to common stock in connection with the January 2013 sale of PMI’s new Series A preferred stock and A-1 preferred stock.
	Conversion
	Under the terms of PMI’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 IPO that values PMI at least at $200,000 and that results in aggregate proceeds to PMI of at least $40,000 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 preferred stock. In addition, if a holder of the new Series A preferred stock has converted any of the new Series A preferred stock, then all of such holder’s shares of Series A-1 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, PMI shall pay such holder cash in an amount equal to the fair market value of such fractional shares, as determined by PMI’s board of directors. At present, the new Series A preferred stock and new Series B preferred stock converts into PMI common stock at a 1:1 ratio while the Series A-1 preferred stock converts into PMI common stock at a 1,000,000:1 ratio.
	Liquidation Rights
	Each holder of new Series A preferred stock and new Series B 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 preferred stock and new Series B 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 preferred stock and new Series B preferred stock, the holders of Series A-1 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 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 preferred stock, new Series B 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 preferred stock which the holders of new Series A preferred stock shall be entitled to receive is three times the original issue price for the new Series A preferred stock. At present, the liquidation preferences are equal to $1.44215155 per share for the new Series A preferred stock, $10.00 per share for the Series A-1 preferred stock and $3.01613647 per share for the new Series B preferred stock.
	Voting
	Each holder of shares of preferred stock shall be entitled to the number of votes equal to the number of shares of common stock into which such shares of preferred stock could be converted and shall have voting rights and powers equal to the voting rights and powers of the common stock.  The holders of preferred stock and the holders of common stock shall vote together as a single class (except with respect to certain matters that require separate votes or as required by law), and shall be entitled to notice of any stockholders’ meeting in accordance with the bylaws of PMI.
	Common Stock
	PMI, through its amended and restated certificate of incorporation, is the sole issuer of common stock and related options and warrants. On October 29, 2013, PMI amended and restated its certificate of incorporation to effect a 10-for-1 reverse stock split. The total number of shares of stock which PMI has the authority to issue is 68,761,533, consisting of 41,487,465 shares of common stock, $0.01 par value per share, and 27,274,068 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.
	Common Stock Issued for Services
	Nonemployees
	In August 2013, PMI granted an immediately vested option to purchase 47,601 common shares to a nonemployee for services.
	PMI did not grant any immediately vested common shares to nonemployees for services during the year ended December 31, 2012.
	Common Stock Issued upon Exercise of Stock Options
	For the years ended December 31, 2013 and 2012, PMI issued 7,327,959 and 13,388 shares of common stock, respectively, upon the exercise of options for cash proceeds of $864 and $19, respectively, of which 6,499,463 and zero were unvested, respectively
	For the years ended December 31, 2013 and 2012, PMI repurchased 100,509 and zero shares of restricted stock for approximately $41 and zero, respectively, upon termination of employment of various employees.
	The number of shares reflects a 10-for-1 reverse stock split effected by PMI on October 29, 2013.
	Common Stock Issued upon Exercise of Warrants
	For the years ended December 31, 2013 and 2012 PMI issued 820 and zero shares of common stock upon the exercise of warrants, respectively for $0.01 per share.
	The number of shares reflects a 10-for-1 reverse stock split effected by the Company on October 29, 2013.

Stock_Option_Plan_and_Compensa

Stock Option Plan and Compensation	12 Months Ended
	Dec. 31, 2013
Stock Option Plan and Compensation [Abstract]	'
Stock Option Plan and Compensation	'
	10.    Stock Option Plan and Compensation
	Incentive stock options are granted to employees at an exercise price not less than 100% of the fair value of PMI’s common stock on the date of grant. Non-statutory stock options are granted to consultants and directors at an exercise price not less than 85% of the fair value of PMI’s common stock on the date of grant. If options are granted to stockholders who hold 10% or more of PMI’s common stock on the option grant date, then the exercise price shall not be less than 110% of the fair value of PMI’s common stock on the date of grant. The fair value is based on a good faith estimate by the board of directors at the time of each grant. As there is no active trading market for these options, such estimate may ultimately differ from valuations completed by an independent party. The options generally vest over four years, which is the same as the performance period. In no event are options exercisable more than ten years after the date of grant.
	In 2005, PMI’s stockholders approved the adoption of the 2005 Plan. On December 1, 2010, PMI’s stockholders approved the adoption of the Amended and Restated 2005 Stock Plan (as amended and restated, the “Plan”). Under the Plan, options to purchase up to 187,946 shares of common stock were reserved and may be granted to employees, directors, and consultants by the board of directors and stockholders to promote the success of PMI’s business. During 2011, the board of directors and stockholders increased the total number of options under the Plan by an additional 455,087 for a total of 135,396 available for grant. During 2012, the board of directors, either directly or through the compensation committee, and stockholders increased the total number of options under the Plan by an additional 170,000 for a total of 1,523,966, available for grant. During 2013, the board of directors, either directly or through the compensation committee, and stockholders increased the total number of options under the Plan by an additional 11,110,825 for a total of 12,634,791 available for grant.
	At December 31, 2013, there were 5,414,052 stock options available for grant under the Plan. The number of shares reflects a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
	Option activity under the 2005 Plan is summarized as follows for the years below:
	The share amounts and share price reflect a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
			Options				Weighted-
			Issued				Average
			and				Exercise
			Outstanding				Price
	Balance as of January 1, 2012			1,208,762			$	2.08
	Options granted (weighted average fair value of $1.05)			288,796				1.7
	Options exercised - vested			(13,389	)			1.42
	Options exercised - nonvested			-				-
	Options canceled			(310,353	)			1.9
	Balance as of December 31, 2012			1,173,816			$	2.03
	Balance as of January 1, 2013			1,173,816			$	2.03
	Options granted (weighted average fair value of $0. 07)			7,912,933				0.1
	Options exercised - vested			(828,496	)			0.2
	Options exercised - nonvested			(6,499,463	)			0.1
	Options canceled			(820,205	)			1.77
	Balance as of December 31, 2013			938,585			$	1.39
	Options outstanding and exercisable at December 31, 2013			575,258			$	1.87
	The fair value of stock option awards for the years 2013 and 2012 was estimated at the date of grant using the Black-Scholes model with the following average assumptions:
			Years Ended December 31,
			2013				2012
	Volatility of common stock			73.3	%			73.3	%
	Risk-free interest rate			1.9	%			1.3	%
	Expected life*		5.8 years				4.6 years
	Dividend yield			0	%			0	%
	Weighted-average fair value of grants		$	0.07			$	0.1
	* For nonemployee stock option awards, the expected life is the contractual term of the award, which is generally ten years.
	The Black-Scholes model requires the input of highly subjective assumptions, including the expected stock price volatility. Because PMI's equity awards have characteristics significantly different from those of traded options, the changes in the subjective input assumptions can materially affect the fair value estimate.
	Other Information Regarding Stock Options
	Additional information regarding common stock options outstanding as of December 31, 2013 is as follows:
					Options Outstanding										Options Vested and Exercisable
	Exercise				Number				Weighted		Weighted Avg.		Intrinsic		Number		Weighted		Intrinsic
	Prices				Outstanding				Avg.		Exercise Price		Value		Exercisable		Avg.		Value
									Remaining								Exercise
									Life								Price
	$	0.1				288,689				9.62	$	0.1	$	-		57,721	$	0.1	$	-
		1.2				171,181				7.71		1.2		–		126,007		1.2		–
		1.7				144,791				8.37		1.7		–		64,934		1.7		–
		2				300,074				6.56		2		–		292,746		2		–
		2.5				1,500				1.55		2.5		–		1,500		2.5		–
		5				11,000				2.67		5		–		11,000		5		–
		5.6				18,250				5.71		5.6		–		18,250		5.6		–
		19.4				3,100				5.04		19.4		–		3,100		19.4		–
						938,585				7.91	$	1.39	$	–		575,258	$	1.36	$	–
	The number of options reflects a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
	The number of options outstanding, vested and expected to vest as of December 31, 2013 was 777,148 and the weighted-average remaining contractual life was 10.86 years.
	The intrinsic value is calculated as the difference between the value of PMI 's common stock at December 31, 2013, which was $0.01 per share, and the exercise price of the options.
	No compensation expense is recognized for unvested shares that are forfeited upon termination of service, and the stock-based compensation expense for the years ended December 31, 2013 and 2012 reflect the expenses that PMI expects to recognize after the consideration of estimated forfeitures.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Taxes [Abstract]	'
Income Taxes	'
	11.    Income Taxes
	PMI did not have any current or deferred federal or state income tax expense for the years ended December 31, 2013 and 2012.  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:
		Years Ended December 31,
		2013			2012
	Federal tax at statutory rate		34	%		34	%
	State tax at statutory rate (net of federal benefit)		2	%		2	%
	Change in valuation allowance		(38	)%		(36	)%
	Other		2	%		0	%
			0	%		0	%
	Temporary items that give rise to significant portions of deferred tax assets and liabilities (tax-effected) at December 31, 2013 and 2012 are as follows:
		December 31,
		2013			2012
	Net operating loss carryforwards	$	39,872		$	29,394
	Research & other credits		660			527
	Fixed assets		(23	)		21
	Accrued liabilities and other		350			289
			40,859			30,231
	Fair value of loans		(1,051	)		(618	)
	Valuation allowance		(39,808	)		(29,613	)
	Net deferred tax asset	$	-		$	-
	The valuation allowance as of December 31, 2013, increased to ($39,808) from ($29,613) in the prior fiscal year, an increase of 34%. The net deferred tax asset of $39,808 at December 31, 2013 consists of a net current deferred tax asset of $188 and a net noncurrent deferred tax asset of $39,620.  The net deferred tax asset of $29,613 at December 31, 2012 consists of a net current deferred tax asset of $116 and a net noncurrent deferred tax asset of $29,497. Under ASC 740, Accounting for Income Taxes, 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 PMI’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.
	PMI has determined that its net deferred tax asset did not satisfy the recognition criteria set forth in ASC 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 $39,808 and $29,613 for the years ended December 31, 2013 and 2012, 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, PMI’s ability to utilize net operating losses and credit carryforwards may be limited in the future as the result of such an “ownership change.”
	PMI has not performed a Section 382 analysis (which subjects the amount of pre-change NOLs and certain other pre-change tax attributes that can be utilized to an annual limitation).  Use of the net operating loss and credit carryforwards may be subject to a substantial annual limitation due to the ownership change provisions of U.S. tax law and similar state provisions. The annual limitation may result in the expiration of net operating losses and credits before utilization.
	PMI files Federal and various state income tax returns.  PMI has net operating loss carryforwards for both federal and state income tax purposes of approximately $101,798 and $92,109 respectively as of December 31, 2013, 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.  PMI also has federal and California research and development tax credits of approximately $445 and $466, respectively.  The federal research credits will begin to expire in the year 2025, and the California research credits have no expiration date.  The $674 capital loss incurred in 2007 for Federal and California has expired in 2012.
	As of December 31, 2013, PMI’s federal and state tax returns for the years ended December 31, 2010 and December 31, 2009, 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:
		December 31,			December 31,
		2013			2012
	Balance at January 1, 2013	$	186		$	-
	Increase related to current year tax position		33			-
	Increase related to tax position of prior years		8			186
	Balance at December 31, 2013	$	227		$	186
	A total of $188 of the unrecognized tax benefits would affect PMI’s effective tax rate.  PMI 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.
	PMI'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, 2013, PMI has not accrued interest or penalties.

Commitments_and_Contingencies

Commitments and Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Commitments and Contingencies	'
	12.   Commitments and Contingencies
	Future Minimum Lease Payments
	PMI leases its corporate office and co-location facility under non-cancelable operating leases that expire in December 2014 and August 2014, respectively.
	Future minimum rental payments under these leases as of December 31, 2013 are as follows:
	Year ending December 31:	2013
	2014	$	502
	2015		-
	Total future operating lease obligations	$	502
	Rental expense under premises-operating lease arrangements was $633 and $532 for the years ended December 31, 2013 and 2012, respectively.
	PMI amended and restated an agreement with WebBank, an FDIC-insured Utah-chartered industrial bank, under which all loans originated through the platform are made by WebBank under its bank charter. The arrangement allows for loans to be offered to borrowers at uniform nationwide terms. PMI is required to pay the greater of a monthly minimum fee or a fee calculated based on a certain percentage of monthly loan origination volume.
	PMI has an agreement with a third party broker-dealer in which the third party agreed to operate and maintain the Note Trader Platform for the secondary trading of Notes.  PMI is required to pay the third party broker-dealer an agreed upon monthly fee which equals the difference between the minimum monthly fee and the transaction fees collected by the third party provider during that month.
	Securities Law Compliance
	From inception through October 16, 2008, PMI sold approximately $178,000 of Borrower Loans to lender members through the old platform structure, whereby PMI assigned promissory notes directly to lender members. PMI did not register the offer and sale of the promissory notes corresponding to these loans under the Securities Act or under the registration or qualification provisions of any state securities laws. PMI 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, PMI would have failed to comply with the registration and qualification requirements of federal and state laws and lender members who hold these promissory notes may be entitled to rescission of unpaid principal, plus statutory interest. Generally, the federal statute of limitations for noncompliance with the requirement to register securities under the Securities Act is one year from the violation, although the statute of limitations period under various state laws may be for a longer period of time.
	PMI’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, PMI and the North American Securities Administrators Association (“NASAA”) reached agreement on the terms of a model consent order between PMI and the states in which PMI offered loan notes for sale prior to November 2008. The consent order involves payment by PMI of up to an aggregate of $1,000 in penalties, which have been allocated among the states based on PMI’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 $1,000 in exchange for its agreement to terminate, or refrain from initiating, any investigation of PMI’s 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. PMI 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 PMI, subject to any applicable statute of limitations. As of December 31, 2013, PMI has entered into consent orders with 34 states and has paid an aggregate of $466 in penalties to those states.
	As of December 31, 2013 and 2012, PMI had accrued approximately $248 and $248, 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 $1,000 maximum fee pro-rata by state, using PMI’s 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, PMI 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 PMI; 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. PMI will continue to evaluate this accrual and related assumptions as new information becomes known.
	On November 26, 2008, plaintiffs filed a class action lawsuit against PMI 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 PMI offered and sold unqualified and unregistered securities in violation of the California and federal securities laws.  The lawsuit sought class certification, damages and the right of rescission against PMI and the other named defendants, as well as treble damages against PMI and the award of attorneys’ fees, experts’ fees and costs, and pre-judgment and post-judgment interest.
	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 pending before the Superior Court, entered into a Stipulation and Agreement of Compromise, Settlement, and Release (the “Settlement”) setting forth an agreement to settle all claims related thereto. In connection with the Settlement, PMI agreed to pay the plaintiffs, and took the charge on the income statement, an aggregate amount of $10,000, payable according to the following schedule: (i) $2,000 within 10 days of entry of an order by the Court granting preliminary approval of the settlement (“Preliminary Approval”); (ii) $2,000 on the one-year anniversary of Preliminary Approval; (iii) $3,000 on the two-year anniversary of Preliminary Approval; and (iv) $3,000 on the three-year anniversary of Preliminary Approval. The settlement is subject to final approval by the Superior Court. Subject to satisfaction of the conditions set forth in the Settlement, the defendants will be released by the plaintiffs from all claims concerning or arising out of the offering of promissory notes on the platform from January 1, 2006 through October 14, 2008.
	As a result of the Settlement, PMI recorded the Settlement in the condensed consolidated statement of operations and a reserve for class action settlement liability of $10,000 in the consolidated balance sheet as of December 31, 2013.
	PMI’s insurance carrier with respect to the class action lawsuit, Greenwich Insurance Company (“Greenwich”), denied coverage.  On August 21, 2009, PMI filed suit against Greenwich in the Superior Court of California, County of San Francisco, California.  The lawsuit sought a declaration that PMI was entitled to coverage under its policy with Greenwich for losses arising out of the class action lawsuit as well as damages and the award of attorneys’ fees and pre- and post-judgment interest.
	On January 26, 2011, the court issued a final statement of decision finding that Greenwich has a duty to defend the class action lawsuit, and requiring that Greenwich pay PMI's past and future defense costs in the class action suit up to $2,000.  Greenwich subsequently made payments to PMI in the amount of $2,000 to reimburse PMI for the defense costs it had incurred in the class action suit.  On October 22, 2012 Greenwich made an additional payment of $143 to PMI for pre-judgment interest. As a result, Greenwich has now satisfied its obligations with respect to PMI’s defense costs for the class action litigation.
	On July 1, 2011, PMI and Greenwich entered into a Stipulated Order of Judgment pursuant to which PMI agreed to dismiss its remaining claims against Greenwich.  On August 12, 2011, Greenwich filed a notice of appeal of the court's decision regarding Greenwich’s duty to defend up to $2,000.

Related_Parties

Related Parties	12 Months Ended
	Dec. 31, 2013
Related Parties [Abstract]	'
Related Parties	'
	13.    Related Parties
	Since PMI’s inception, it has engaged in various transactions with its directors, executive officers and holders of more than 5% of its voting securities, and immediate family members and other affiliates of its directors, executive officers and 5% stockholders. Since January 1, 2009, PMI has engaged in financial transactions with an aggregate value of greater than $6,174 with its directors, executive officers and holders of more than 5% of its voting securities and other affiliates of its directors and executive officers. PMI 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.
	PMI's executive officers, directors who are not executive officers and certain affiliates participate on PMI'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 PMI Group as of December 31, 2013 and 2012 are summarized below:
	Related Party	Aggregate Amount of				Income Earned on
		Notes and Borrower				Notes and Borrower
		Loans				Loans
		Purchased
		2013		2012		2013		2012
	Executive officers and management	$	1,387	$	139	$	90	$	7
	Directors		622		3,996		255		334
		$	2,009	$	4,135	$	345	$	341
	The Notes and Borrower Loans were obtained on terms and conditions that were not more favorable than those obtained by other lenders. Of the total aggregate amount of Borrower Loans purchased since inception approximately $385 or 6% and $236 or 6% of principal has been charged off through December 31, 2013 and 2012, respectively. PMI has earned approximately $21 and $18 in servicing fee revenue related to these Notes and Borrower Loans for the years ended December 31, 2013 and 2012, respectively.

Postretirement_Benefit_Plans

Postretirement Benefit Plans	12 Months Ended
	Dec. 31, 2013
Postretirement Benefit Plans [Abstract]	'
Postretirement Benefit Plans	'
	14.    Postretirement Benefit Plans
	PMI 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.  PMI’s contributions to the plan are discretionary. PMI has not made any contributions to the plan to date.

Subsequent_Events

Subsequent Events	12 Months Ended
	Dec. 31, 2013
Subsequent Events [Abstract]	'
Subsequent Events	'
	15.    Subsequent Events
	On March 10, 2014, the boards of PMI and Prosper Funding, respectively, appointed Aaron Vermut, who previously served as President of PMI and Prosper Funding, to the position of Chief Executive Officer of PMI and Prosper Funding. In connection with Aaron Vermut’s appointment as Chief Executive Officer of PMI and Prosper Funding, Stephen P. Vermut, who previously served as Chief Executive Officer of PMI and Prosper Funding, has been appointed by the boards of PMI and Prosper Funding, respectively, to the role of Executive Chairman of PMI and Prosper Funding.
	In connection with the foregoing appointments, the boards of PMI and Prosper Funding, respectively, also appointed Ronald Suber to the role of President of PMI and Prosper Funding.  Mr. Suber served as PMI’s Head of Global Institutional Sales and Prosper Funding’s Vice President prior to his appointment as President.

Schedule_I_Prosper_Funding_LLC

Schedule I, Prosper Funding LLC	12 Months Ended
	Dec. 31, 2013
Schedule I, Prosper Funding LLC [Abstract]	'
Schedule I, Prosper Funding LLC, A Development Stage Company	'
	Prosper Funding LLC
	Consolidated Balance Sheets
	(amounts in thousands)
		December 31,				December 31,
		2013				2012
	Assets
	Cash and cash equivalents	$	5,789			$	5
	Restricted cash		12,299				-
	Loans held for investment		3,917				-
	Borrower loans receivable at fair value		226,238				-
	Property and equipment, net		1,980				-
	Other assets		14				-
	Total Assets	$	250,237			$	5
	Liabilities and Member's Equity
	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				-
	Member's Equity
	Member's equity		16,076				210
	Retained earnings (accumulated deficit)		3,418				(205	)
	Total Member's Equity		19,494				5
	Total Liabilities and Member's Equity	$	250,237			$	5
	The accompanying notes are an integral part of these consolidated financial statements.
	Prosper Funding LLC
	Consolidated Statements of Operations
	(amounts in thousands)
		For the Twelve Months Ended December 31,
		2013				2012
	Revenues
	Administration fee revenue	$	7,632			$	-
	Interest income on borrower loans		32,862				-
	Interest expense on notes		(30,564	)			-
	Total Revenues		9,930				-
	Cost of Revenues
	Cost of services		(1,270	)			-
	Provision for repurchase and indemnification obligation		(83	)			-
	Net Revenues		8,577				-
	Operating Expenses
	Administration fee expense		5,053				-
	Depreciation and amortization		538				-
	Professional services		26				114
	Other operating expenses		242				91
	Total Operating Expenses		5,859				205
	Income (Loss) Before Other Income and Expenses		2,718				(205	)
	Other Income and Expenses
	Change in fair value on borrower loans, loans held for investment and notes, net		877				-
	Other income		28				-
	Total Other Income and Expenses, net		905				-
	Income (Loss) Before Income Taxes	$	3,623			$	(205	)
	Provision for income taxes		-				-
	Total Net Income (Loss)	$	3,623			$	(205	)
	The accompanying notes are an integral part of these consolidated financial statements.
	Prosper Funding LLC
	Consolidated Statements of Member’s Equity
	(amounts in thousands)
		Member’s				Retained			Total
		Equity				Earnings
						(Accumulated
						Deficit)
	Balance as of December 31, 2011	$	-			$	-		$	-
	Capital infusion from parent		210				-			210
Net loss		-				(205	)		(205	)
Balance as of December 31, 2012	$	210			$	(205	)	$	5
Transfer of assets from PMI		5,865				-			5,865
Capital infusion from parent		10,001				-			10,001
Net Income		-				3,623			3,623
Balance as of December 31, 2013	$	16,076			$	3,418		$	19,494
The accompanying notes are an integral part of these consolidated financial statements.
Prosper Funding LLC
Consolidated Statements of Cash Flows
(amounts in thousands)
	For the Twelve Months
	Ended December 31,
	2013				2012
Cash flows from operating activities:
Net income (loss)	$	3,623			$	(205	)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Change in fair value of notes		(5,734	)			-
Change in fair value of borrower loans		4,856				-
Depreciation and amortization		538				-
Loan loss reserve		(9	)			-
Change in fair value of loans held for investment		1				-
Changes in operating assets and liabilities:
Restricted cash		(8,155	)			-
Other assets		(13	)			-
Accounts payable and accrued liabilities		2,933				-
Net related party payable		205				-
Net cash used in operating activities		(1,755	)			(205	)
Cash flows from investing activities:
Origination of borrower loans held at fair value		(331,353	)			-
Repayment of borrower loans held at fair value		99,313				-
Proceeds from sale of borrower loans held at fair value		171,290				-
Purchases of property and equipment		(1,798	)			-
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 loans held for investment at fair value		10,410				-
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	)			-
Member’s equity capital infusion from parent		10,001				210
Net cash included in transfer of assets from PMI		1,875				-
Net cash provided by financing activities		73,830				210
Net increase in cash and cash equivalents		5,784				5
Cash and cash equivalents at beginning of the period		5				-
Cash and cash equivalents at end of the period	$	5,789			$	5
Supplemental disclosure of cash flow information:
Restricted cash	$	4,144
Loans held for investment		175
Borrower loans at fair value		170,343
Property and equipment, net		721
Accrued liabilities		(779	)
Notes at fair value		(170,573
Loan repurchase and indemnification obligation		(41	)
Non-cash transfer		3,990
Cash transferred		1,875
Total transfer of net non-cash assets from PMI	$	5,865
The accompanying notes are an integral part of these consolidated financial statements.
Prosper Funding LLC
Notes to Consolidated Financial Statements
1.      Organization and Business
Prosper Funding LLC (“Prosper Funding”) 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”).
Prosper Funding was formed by PMI to hold Borrower Loans and issue Notes through the platform.  Although Prosper Funding is consolidated with PMI for accounting and tax purposes, Prosper Funding 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.  Prosper Funding’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 Prosper Funding will become subject to bankruptcy proceedings directly.  Prosper Funding 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. In these notes to financial statements, the unsecured, consumer loans originated through the platform, which are referred to elsewhere in this Annual Report as “PMI Borrower Loans” and “Prosper Funding Borrower Loans”, are referred to collectively as “Borrower Loans”, and the borrower payment dependent notes issued through the platform, which are referred to elsewhere in this Annual Report as “PMI Notes” and “Prosper Funding Notes”, are referred to collectively as “Notes”.
On January 22, 2013, PMI entered into an Asset Transfer Agreement with Prosper Funding pursuant to which PMI transferred substantially all of its remaining assets to Prosper Funding, 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 the Notes or the Borrower Loans, and (iv) all documents and information related to the foregoing, effective February 1, 2013.
Prosper Funding commenced operations as of February 1, 2013 when PMI transferred ownership of the platform, including all of the rights related to the operation of the platform, to Prosper Funding. Since February 1, 2013, all Notes issued and sold through the platform are issued, sold and serviced by Prosper Funding.  Pursuant to a Loan Account Program Agreement between PMI and WebBank, PMI manages the operation of the platform, 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 loans by WebBank. Pursuant to an Administration Agreement between Prosper Funding and PMI, PMI manages all other aspects of the platform on behalf of Prosper Funding.
All loans requested and obtained through the platform 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, 2013. All loans made through the platform are funded by WebBank, an FDIC-insured, Utah chartered industrial bank.  After funding a loan, WebBank sells the loan to Prosper Funding, without recourse to WebBank, in exchange for the principal amount of the loan.  WebBank does not have any obligation to purchasers of the Notes.
Prosper Funding formed Prosper Asset Holdings LLC (“PAH”) in November 2013 as a limited liability company with the sole equity member being Prosper Funding. PAH was formed to purchase Borrower Loans from Prosper Funding and sell the Borrower Loans to third parties.
2.      Significant Accounting Policies
Basis of Presentation
Prosper Funding’s consolidated financial statements include the accounts of Prosper Funding and its wholly-owned subsidiary PAH. All intercompany balances and transactions between Prosper Funding and PAH have been eliminated in consolidation. Prosper Funding's financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).
Use of Estimates
The preparation of 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 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 borrower loans receivable and associated member payment dependent notes, valuation of servicing rights, and contingent liabilities. Estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.
Certain Risks and Concentrations
In the normal course of its business, Prosper Funding encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject Prosper Funding to significant concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash. Prosper Funding 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. Prosper Funding 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 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, Prosper Funding does not bear the risk on such Borrower Loan.
Prosper Funding 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 Prosper Funding's financial position and results of operations.
Cash and Cash Equivalents
Prosper Funding invests its excess cash primarily in highly liquid debt instruments of the U.S. government and its agencies. All highly liquid investments with stated maturities of three months or less from date of purchase are classified as cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Such deposits periodically exceed amounts insured by the FDIC. Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking, money market and short-term certificate of deposit accounts.
Restricted Cash
Restricted cash consists primarily of cash deposits held as collateral as required for loan funding and servicing activities.
Borrower Loans and Notes
Prosper Funding has adopted the provisions of ASC Topic 825, Financial Instrument.  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.  The fair value election, with respect to an item, may not be revoked once an election is made.  In applying the provisions of ASC Topic 825, Prosper Funding records assets and liabilities measured using the fair value option in a way that separates these reported fair values from the carrying values of similar assets and liabilities measured with a different measurement attribute.  Prosper Funding does not record a specific allowance account related to the Borrower Loans and Notes in which it has elected the fair value option, but rather estimate the fair value of the Borrower Loans and Notes using discounted cash flow methodologies adjusted for Prosper Funding’s historical payment, loss and recovery rates. An account is considered to be a loss, or charged-off, when it reaches more than 120 days past due.  Prosper Funding has reported the aggregate fair value of the Borrower Loans and Notes as separate line items in the assets and liabilities sections of the accompanying balance sheets using the methods described in ASC Topic 820, Fair Value Measurements and Disclosures—See Fair Value Measurement.
Member Loans Sold Directly to Third Party Purchasers
For Borrower Loans sold to unrelated third party purchasers on a servicing retained basis, a gain or loss is recorded on the sale date. In order to calculate the gain or loss, Prosper Funding first determines whether the terms of the servicing arrangement with the purchaser results in a net servicing asset (i.e., when contractual/expected servicing revenues adequately compensate Prosper Funding) or a net servicing liability (i.e., when contractual/expected servicing revenues do not adequately compensate Prosper Funding). When contractual/expected servicing revenues do not adequately compensate Prosper Funding, a portion of the gross proceeds of the Borrower Loans sold on a servicing retained basis are allocated to the recording of a net servicing liability. Conversely, when contractual/expected servicing revenues provide more than adequate compensation to Prosper Funding, the excess servicing compensation is allocated to the gross proceeds of the Borrower Loans sold and results in the recording of a net servicing asset.
Prosper Funding estimates the fair value of the loan servicing asset or liability considering the contractual servicing fee revenue, adequate compensation for Prosper Funding’s servicing obligation, the current principal balances of the Borrower Loans and projected servicing revenues given projected defaults and prepayments (if significant) over the remaining lives of the Borrower Loans.
Loans held for investment
Loans held for investment are primarily comprised of loans held for short durations and are recorded at cost which approximates fair value.
Internal Use Software and Website Development
Prosper Funding 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 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. Prosper Funding 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 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 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 asset.
Repurchase and Indemnification Obligation
Prosper Funding is obligated to indemnify lenders and repurchase certain Notes and member loans sold directly to third party purchasers in the event of violation of applicable federal, state, or local lending laws, or verifiable identify theft. The loan indemnification and repurchase obligation is estimated based on historical experience. Prosper Funding accrues a provision for the repurchase and indemnification obligation when the Notes or member loans are issued. Indemnified or repurchased Notes and member loans associated with federal, state, or local lending laws, or verifiable identity thefts are written off at the time of repurchase or at the time an indemnification payment is made.
Revenue Recognition
Revenue is recognized in accordance with ASC Topic 605, Revenue Recognition.  Under ASC Topic 605, PMI recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the price of the services is fixed and determinable, and collectability is reasonably assured.
Administration Agreement License Fees
Prosper Funding primarily generates revenues through license fees it earns through an Administration Agreement with PMI.  The Administration Agreement contains a license granted by Prosper Funding 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.
Loan servicing fees
Loan servicing revenue includes monthly loan servicing fees and non-sufficient funds (“NSF”) fees. Loan servicing fees are accrued daily based on the current outstanding loan principal balance of the Borrower Loans but are not recognized until payment is received due to the uncertainty of collection of borrower loan payments. NSF fees are charged to borrowers on the first failed payment of each billing period.  NSF fees are charged to the customer and collected and recognized immediately.
Interest income on Borrower Loans Receivable and Interest Expense on Notes
Prosper Funding recognizes interest income on Borrower Loans and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent that is believed it to be collectable.  Below is a table which summarizes the gross interest income on Borrower Loans and expense on Notes for the twelve months ended December 31, 2013 and 2012.
	December 31,
	2013				2012
Interest income on borrower loans	$	32,862			$	-
Interest expense on notes		(30,564	)			-
Net interest income	$	2,298			$	-
Fair Value Measurement
Prosper Funding follows ASC Topic 820, Fair Value Measurements and Disclosures, which 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 but does not expand the use of fair value in any new circumstances.
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 while the cost basis of certain financial instruments may include initial 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 value of financial instruments 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 receivable, 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, 2013 and 2012:
31-Dec-13	Level 1				Level 2			Level 3			Fair Value
	Inputs				Inputs			Inputs
Assets
Borrower loans receivable	$	-			$	-		$	226,238		$	226,238
Certificates of deposit and restricted cash		11,028				1,271			-			12,299
Loans held for investment		-				-			3,917			3,917
Liabilities
Notes	$	-			$	-		$	226,794		$	226,794
31-Dec-12	Level 1				Level 2			Level 3			Fair Value
	Inputs				Inputs			Inputs
Assets
Short term investments	$	-			$	-		$	-		$	-
Certificates of deposit		-				-			-			-
Borrower loans receivable		-				-			-			-
Loans held for investment		-				-			-			-
Liabilities
Notes	$	-			$	-		$	-		$	-
As observable market prices are not available for the Borrower Loans and Notes, or for similar assets and liabilities, Prosper Funding believes the Borrower Loans and Notes should be considered Level 3 financial instruments under ASC Topic 820.  In a hypothetical transaction as of the measurement date, Prosper Funding believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which Prosper Funding might offer those loans may result in differences between the originated amount of the Borrower Loans and their fair value as of the transaction date.  For Borrower Loans, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, roll rates, recovery 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 its 1.0% servicing fee.  The fair value election for Borrower Loans and Notes 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 lender members that are dependent upon borrower payments.  As such, the aggregate fair value of a group of Notes corresponding to a particular Borrower Loan is approximately equal to the fair value of that Borrower Loan, adjusted for the 1.0% servicing fee and the timing of borrower payments subsequently disbursed to such Note holders.  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 6 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.
The changes in Level 3 assets measured at fair value on a recurring basis are as follows:
Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Borrower				Notes			Loans			Total
	Loans							Held for
								Investment
Balance at January 1, 2013	$	-			$	-		$	-		$	-
Assets transferred on February 1, 2013		170,344				(170,574	)		175			(55	)
Originations		331,353				(159,921	)		14,296			185,728
Principal repayments and credit losses		(99,313	)			97,967			(143	)		(1,489	)
Borrower loans sold to third parties		(171,290	)						(10,410	)		(181,700	)
Change in fair value on borrower loans and notes		(4,856	)			5,734			-			878
Change in fair value of loans held for investment		-				-			(1	)		(1	)
Balance at December 31, 2013	$	226,238			$	(226,794	)	$	3,917		$	3,361
Quantitative information about Prosper Funding’s Level 3 fair value measurements of its borrower loans and notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to Prosper Funding’s fair value measurements.
	Fair			Valuation Technique		Unobservable Inputs
Assets and	Value as
Liabilities	of
	December
	31
Borrower loans receivable at fair value	$	226,238		Discounted Cashflow		Default rates and discount rates
Notes at fair value	$	(226,794	)	Discounted Cashflow		Default rates and discount rates
3.      Cash and Cash Equivalents
Cash and cash equivalents consist of the following:
	December 31,
Cash and cash equivalents	2013				2012
Cash in bank	$	5,789			$	5
Total cash and cash equivalents	$	5,789			$	5
4.      Property and Equipment
Property and equipment consist of the following:
	December 31,
	2013				2012
Property and equipment:
Internal-use software	$	3,454			$	-
Property and equipment		3,454				-
Less accumulated depreciation and amortization		(1,474	)
Total property and equipment, net	$	1,980			$	-
Depreciation expense for 2013 and 2012 was $538 and $0, respectively. Prosper Funding capitalized internal-use software costs in the amount of $1,798 and $0 for the years ended December 31, 2013 and 2012, respectively.
5.      Loans Held for Investment
During the year ended December 31, 2013, a total of $14,296 of Borrower Loans originated through the platform were held by Prosper Funding as Loans held for investment. During the year ended December 31, 2013, $10,410 of these Borrower Loans were sold to an unrelated third party. Loans held for investment on the consolidated balance sheets as of December 31, 2013 and 2012 was $3,917 and $0, respectively. When a Borrower Loan has been funded by Prosper Funding in whole, or in part, the portion of the borrower’s monthly loan payment that corresponds to the percentage of the Borrower Loan that was funded by Prosper Funding is retained. In these cases, interest income is recorded on such Borrower Loans.
The fair value of the Borrower Loans held for investment is estimated using discounted cash flow methodologies based upon a set of valuation assumptions similar to those of Borrower Loans, which are set forth in Note 2, as they have similar characteristics and Prosper Funding expects these loans to behave in a comparable manner.  The valuation assumptions used to value these loans include prepayment rates, default rates and recovery rates derived from historical loan performance data and discount rates based on the credit grade applied to each loan.
The fair value adjustment on the Borrower Loans held for investment was $(1) and $0, which is included in earnings for the year ended December 31, 2013 and 2012, respectively.  During the year ended December 31, 2013 Prosper Funding has received $143 in payments on these loans. During the year ended December 31, 2013, there was $14 in Borrower Loans held for investment that were charged-off.
6.      Borrower Loans and Notes Held at Fair Value
The Company estimates the fair value of the Borrower Loans and Notes using discounted cash flow methodologies based upon a set of valuation assumptions. The primary assumptions used to value the Borrower Loans and Notes include default rates derived from historical performance and discount rates applied to each Prosper Rating tranche based on the perceived credit risk of each such Prosper Rating. If PMI does not receive payments on a Borrower Loan, PMI is not obligated to and does not make payments on the corresponding Notes. The aggregate fair value of a group of Notes corresponding to a particular Borrower Loan is approximately equal to the fair value of that Borrower Loan, adjusted for the 1.0% servicing fee and the timing of borrower payments subsequently disbursed to Note holders. The effective interest rate associated with the Notes is less than the interest rate earned on the corresponding Borrower Loan due to the 1.0% servicing fee.
Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2013 for Borrower Loans and Notes are presented in the following table:
	Borrower Loans				Notes
Discount rate assumption:		9.77	%*			9.77	%*
Resulting fair value from:
100 basis point increase	$	222,989			$	220,362
200 basis point increase		220,363				217,756
Resulting fair value from:
100 basis point decrease	$	228,465			$	225,784
200 basis point decrease		231,282				228,560
Default rate assumption:		7.2	%*			7.2	%*
Resulting fair value from:
10% higher default rates	$	223,233			$	220,620
20% higher default rates		220,039				217,439
Increase in fair value  and income (loss) to earnings from:
10% lower default rates	$	228,151			$	225,477
20% lower default rates		230,554				227,866
* Represents weighted average assumptions considering all Prosper Ratings.
The changes in fair value would directly impact the change in fair value on loans, loans held for investment and Notes in the consolidated statements of operations.
Due to the recent origination of the Borrower Loans and Notes, the change in fair value attributable to instrument-specific credit risk is immaterial.  Of the Borrower Loans originated from July 13, 2009 to December 31, 2013, 332 loans were 90 days or more delinquent for an aggregate principal amount of $1,941 and a fair value of $175 as of December 31, 2013.
7.      Repurchase and Indemnification Obligation
Changes in Prosper Funding’s repurchase and indemnification obligations are summarized below:
	Years Ended December 31,
	2013				2012
Beginning of year balance:	$	-			$	-
Provision for repurchases and indemnifications		41				-
Amounts repurchased and immediately charged off or charged off and indemnified (net of recoveries)		(9	)			-
End of year balance:	$	32			$	-
For the years ended December 31, 2013 and 2012, the provision for repurchase and indemnification obligation was $83 and $0, respectively.
8.      Income Taxes
Prosper Funding incurred no income tax provision for the year ended December 31, 2013 and 2012.  Prosper Funding 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 Prosper Funding is 0%.
9.      Subsequent Events
On March 10, 2014, the boards of PMI and Prosper Funding, respectively, appointed Aaron Vermut, who previously served as President of PMI and Prosper Funding, to the position of Chief Executive Officer of PMI and Prosper Funding. In connection with Aaron Vermut's appointment as Chief Executive Officer of PMI and Prosper Funding, Stephen P. Vermut, who previously served as Chief Executive Officer of PMI and Prosper Funding, has been appointed by the boards of PMI and Prosper Funding, respectively, to the role of Executive Chairman of PMI and Prosper Funding.
In connection with the foregoing appointments, the boards of PMI and Prosper Funding, respectively, also appointed Ronald Suber to the role of President of PMI and Prosper Funding. Mr. Suber served as PMI's Head of Global Institutional Sales and Prosper Funding's Vice President prior to his appointment as President.

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policies)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts of PMI and its wholly owned subsidiary Prosper Funding. All intercompany balances and transactions between Prosper Funding and PMI have been eliminated in consolidation. PMI and Prosper Funding's financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).
Use of Estimates	'
	Use of Estimates
	The preparation of 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 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 borrower loans receivable and associated member payment dependent notes, valuation of servicing rights, valuation allowance on deferred tax assets, valuation and amortization periods of intangible assets, repurchase and idemnification obligation, stock-based compensation expense, and contingent liabilities. Estimates are based on historical experience and on various other assumptions that are  believed to be reasonable under the circumstances. Actual results could differ from those estimates.
Certain Risks and Concentrations	'
	Certain Risks and Concentrations
	In the normal course of its business, PMI encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject PMI to significant concentrations of credit risk consist primarily of cash, cash equivalents, restricted cash and short term investments. PMI places cash, cash equivalents, restricted cash and short term investments 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.  PMI 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 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, PMI does not bear the risk on such Borrower Loan.
	PMI 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 PMI's consolidated financial position and results of operations (See Note 12—Commitments and Contingencies—Securities Law Compliance).
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	PMI invests its excess cash primarily in highly liquid debt instruments of the U.S. government and its agencies. All highly liquid investments with stated maturities of three months or less from date of purchase are classified as cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking, money market and short-term certificate of deposit accounts.
Restricted Cash	'
	Restricted Cash
	Restricted cash consists primarily of cash deposits held as collateral as required for loan funding and servicing activities.
Short Term Investments	'
	Short Term Investments
	PMI's short term investments consists of highly liquid debt instruments of the U.S. government and its agencies with original maturity periods greater than three months and less than 12 months.  PMI had no short term investments as of the year ended December 31, 2013.
Borrower Loans and Notes	'
	Borrower Loans and Notes
	On July 13, 2009, PMI implemented the operating structure it employed through January 31, 2013 and began issuing Notes. That operating structure resulted in PMI purchasing loans from WebBank and holding the loans until maturity. PMI issued new securities, the Notes, to the winning lender members. PMI’s obligation to repay the Notes was conditioned upon the repayment of the associated Borrower Loan owned by PMI. As a result of those changes, PMI carried the Borrower Loans and the Notes on its balance sheet as assets and liabilities, respectively. In conjunction with that operating structure, PMI adopted the provisions of ASC Topic 825, Financial Instrument. 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. The fair value election, with respect to an item, may not be revoked once an election is made.
	In applying the provisions of ASC Topic 825, PMI recorded assets and liabilities measured using the fair value option in a way that separates these reported fair values from the carrying values of similar assets and liabilities measured with a different measurement attribute. PMI does not record a specific allowance account related to the Borrower Loans and Notes in which PMI has elected the fair value option, but rather estimates the fair value of the Borrower Loans and Notes using discounted cash flow methodologies adjusted for PMI’s historical payment, loss and recovery rates. An account is considered to be a loss, or charged-off, when it reaches more than 120 days past due. PMI has reported the aggregate fair value of the Borrower Loans and Notes as separate line items in the assets and liabilities sections of the accompanying balance sheets using the methods described in ASC Topic 820, Fair Value Measurements and Disclosures—See Fair Value Measurement.
Member Loans Sold Directly to Third Party Purchasers	'
	Member Loans Sold Directly to Third Party Purchasers
	For loans sold to unrelated third party purchasers on a servicing retained basis, a gain or loss is recorded on the sale date. In order to calculate the gain or loss, PMI first determines whether the terms of the servicing arrangement with the purchaser results in a net servicing asset (i.e., when contractual/expected servicing revenues adequately compensate PMI) or a net servicing liability (i.e., when contractual/expected servicing revenues do not adequately compensate PMI). When contractual/expected servicing revenues do not adequately compensate PMI, a portion of the gross proceeds of the loans sold on a servicing retained basis are allocated to the recording of a net servicing liability. Conversely, when contractual/expected servicing revenues provide more than adequate compensation to PMI, the excess servicing compensation is allocated to the gross proceeds of the loans sold and results in the recording of a net servicing asset.
	PMI estimates the fair value of the loan servicing asset or liability considering the contractual servicing fee revenue, adequate compensation for PMI's servicing obligation, the current principal balances of the loans and projected servicing revenues given projected defaults and prepayments (if significant) over the remaining lives of the loans. At December 31, 2013, PMI recorded $144 as a servicing asset related to these loans, which is included in Borrower Loans Receivable at fair value on the consolidated balance sheets.
Loans held for investment	'
	Loans held for investment
	Loans held for investment are primarily comprised of loans held for short durations and are recorded at cost which approximates fair value.
Property and Equipment	'
	Property and Equipment
	Property and equipment consists of computer equipment, office furniture and equipment, and software purchased or developed for internal use. Property and equipment are stated at cost, less accumulated depreciation and amortization. PMI capitalizes expenditures for replacements and betterments and recognizes as expenses amounts for maintenance and repairs as incurred.  Depreciation and amortization commences once the asset is placed in service. Depreciation and amortization are computed using the straight-line method based upon estimated useful lives of the assets as follows:
	Furniture and fixtures	7 years
	Office equipment	5 years
	Computers and equipment	3 years
	Leasehold improvements	3 years
	Software	3 years
Earned Vacations	'
	Earned Vacations
	The Company has a flexible vacation plan for its employees under which employees are entitled to take vacations for such periods of time that do not interfere with the orderly performance of their job responsibilities. Accordingly, no accrual for unpaid vacation pay has been included in the consolidated financial statements.
Internal Use Software and Website Development	'
	Internal Use Software and Website Development
	PMI 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 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. PMI 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 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 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 asset.
Impairment of Long-Lived Assets Including Acquired Intangible Assets	'
	Impairment of Long-Lived Assets Including Acquired Intangible Assets
	In accordance with ASC Topic 360, Property Plant and Equipment, PMI reviews property and equipment and intangible assets for impairment whenever events or changes in circumstances indicate that the carrying values of those assets may not be recoverable.  Recoverability of assets to be held and used is measured by comparing the carrying value of the asset to future net undiscounted cash flows that the assets are expected to generate. If an asset is considered to be impaired, the impairment to be recognized equals the amount by which the asset’s carrying value exceeds its fair value. Fair value is estimated using discounted net cash flows.
	During 2013 management made the decision to discontinue the development of certain of its planned software development projects and to dispose of obsolete computer software and hardware. The assets PMI's capitalized in prior years were deemed to be impaired in accordance with ASC Topic 360, Property, Plant, and Equipment. An impairment charge for obsolete equipment of $62 is included in operating expenses in PMI's consolidated statement of operations for the year ended December 31, 2013.  During 2012, no asset disposals resulted in a loss on impairment of fixed assets.
Repurchase and Indemnification Obligation	'
	Repurchase and Indemnification Obligation
	PMI is obligated to indemnify lenders and repurchase certain Notes and member loans sold directly to third party purchasers in the event of violation of applicable federal, state, or local lending laws, or verifiable identify theft. The loan indemnification and repurchase obligation is estimated based on historical experience. PMI accrues a provision for the repurchase and indemnification obligation when the Notes or member loans are issued. Indemnified or repurchased Notes and member loans associated with federal, state, or local lending laws, or verifiable identity thefts are written off at the time of repurchase or at the time an indemnification payment is made.
Revenue Recognition	'
	Revenue Recognition
	Revenue is recognized in accordance with ASC Topic 605, Revenue Recognition.  Under ASC Topic 605, PMI recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the price of the services is fixed and determinable, and collectability is reasonably assured.
	Origination fees
	The company earns an origination fee upon the successful closing of a loan. The borrower receives an amount equal to the loan amount net of the loan origination fee. The loan origination fee is determined by the term and credit grade of the loan, and ranges from 1.00% to 4.95% of the original principal amount. Since PMI accounts for borrower loans, loans held for investment and Notes at fair value, origination fees are not deferred but are recognized at origination of the loan, and direct costs to originate loans are recorded as expenses as incurred.
	Loan servicing fees
	Loan servicing revenue includes monthly loan servicing fees and non-sufficient funds (“NSF”) fees. Loan servicing fees are accrued daily based on the current outstanding loan principal balance of the Borrower Loans but are not recognized until payment is received due to the uncertainty of collection of borrower loan payments. NSF fees are charged to borrowers on the first failed payment of each billing period.  NSF fees are charged to the customer and collected and recognized immediately.
	Interest income on Borrower Loans Receivable and Interest Expense on Notes
	PMI recognizes interest income on Borrower Loans and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent PMI believes it to be collectable.  Below is a table which summarizes the gross interest income and expense for the twelve months ended December 31, 2013 and 2012.
			December 31,
			2013				2012
	Interest income on borrower loans		$	35,526			$	23,101
	Interest expense on notes			(33,072	)			(21,889	)
	Net interest income		$	2,454			$	1,212
Marketing and Advertising Expense	'
	Marketing and Advertising Expense
	Under the provisions of ASC Topic 720, Other Expenses, the costs of advertising are expensed as incurred. Marketing and advertising costs were approximately $14,851 and $5,683 for the years ended December 31, 2013 and 2012, respectively.
Rebate and Promotional Expenses	'
	Rebate and Promotional Expenses
	PMI accounts for rebates and promotions in accordance with ASC Topic 605, Revenue Recognition.  From time to time PMI offers rebates and promotions to borrower and lender members.  PMI records these rebates and promotions as an offset to revenue if a particular rebate or promotion is earned upon origination of the loan. PMI's rebate and promotions have in the past been in the form of cash back and other incentives paid to lender and borrower members.
Stock-Based Compensation	'
	Stock-Based Compensation
	PMI accounts for its stock-based compensation for employees using fair-value-based accounting in accordance with ASC Topic 718, Stock Compensation.  ASC Topic 718 requires companies to estimate the fair value of stock-based awards on the date of grant using an option-pricing model. The stock-based compensation related to awards that are expected to vest is amortized using the straight line method over the vesting term of the stock-based award, which is generally four years. Expected forfeitures of unvested options are estimated at the time of grant and reduce the recognized stock-based compensation expense. PMI estimated its annual forfeiture rate to be 17.2% and 18.2% for the years ended December 31, 2013 and 2012, respectively.
	PMI has granted options to purchase shares of common stock to nonemployees in exchange for services performed. PMI accounts for stock options and restricted stock issued to nonemployees in accordance with the provisions of ASC Topic 505-50, Equity-Based Payments to Non-Employees, which requires that equity awards be recorded at their fair value.  Under ASC Topic 718 and 505-50, PMI uses the Black-Scholes model to estimate the fair value of options granted to nonemployees at each vesting date until performance is complete to determine the appropriate charge for the services provided. The volatility of PMI's common stock was based on comparative company volatility.
	Total stock-based compensation expense for employees reflected in PMI's statements of operations for the years ended December 31, 2013 and 2012 is approximately $229 and $340, respectively.  As of December 31, 2013, the unamortized stock-based compensation expense related to unvested stock-based awards was approximately $991, which will be recognized over the remaining weighted average vesting period of approximately 4.2 years.
Net Loss Per Share	'
	Net Loss Per Share
	PMI computes net loss per share in accordance with ASC Topic 260 Earnings Per Share. Under ASC Topic 260, basic net loss per share is computed by dividing net loss per share available to common shareholders 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. At December 31, 2013, there were outstanding convertible preferred stock, warrants and options convertible into 27,274,068, 218,810 and 938,585 common shares, respectively, which may dilute future earnings per share. At December 31, 2012 there were outstanding convertible preferred stock, warrants and options convertible into 6,195,813, 260,987 and 1,173,816. Because PMI is reporting a net loss for the years ended December 31, 2013 and 2012, potentially dilutive securities are excluded from the computation of net loss per share, as their effect would be antidilutive.
Income Taxes	'
	Income Taxes
	PMI uses the liability method to account for income taxes. Under this method, deferred income tax assets and liabilities are based on the differences between the financial statements 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.
	Under ASC Topic 740, Income Taxes, PMI's policy to include interest and penalties related to gross unrecognized tax benefits within PMI's provision for income taxes did not change.
Fair Value Measurement	'
	Fair Value Measurement
	PMI adopted ASC Topic 820, Fair Value Measurements and Disclosures, on January 1, 2008. ASC Topic 820 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 but does not expand the use of fair value in any new circumstances.
	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 while the cost basis of certain financial instruments may include initial 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 value of financial instruments 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, short term investments, Borrower Loans receivable, accounts payable and accrued liabilities, Notes and long-term debt.  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, 2013 and 2012:
	31-Dec-13		Level 1				Level 2			Level 3			Fair Value
			Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable		$	-			$	-		$	226,238		$	226,238
	Certificates of deposit & restricted cash			14,032				1,441			-			15,473
	Loans held for investment			-				-			3,917			3,917
	Liabilities
	Notes		$	-			$	-		$	226,794		$	226,794
	31-Dec-12		Level 1				Level 2			Level 3			Fair Value
			Inputs				Inputs			Inputs
	Assets
	Short term investments		$	1,000			$	-		$	-		$	1,000
	Certificates of deposit & restricted cash			4,331				1,618			-			5,949
	Borrower loans receivable			-				-			166,900			166,900
	Loans held for investment			-				-			175			175
	Liabilities
	Notes		$	-			$	-		$	167,478		$	167,478
	Short term investments consist of United States Treasuries with maturity periods greater than three months and less than 12 months.  In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that PMI has the ability to access. PMI classifies United States Treasuries as Level 1 assets.  PMI intends to hold these investments until maturity.
	As observable market prices are not available for the Borrower Loans and Notes, or for similar assets and liabilities, PMI believes the Borrower Loans and Notes should be considered Level 3 financial instruments under ASC Topic 820.  In a hypothetical transaction as of the measurement date, PMI believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which PMI 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, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, roll rates, recovery rates and discount rates based on the perceived credit risk within each credit grade.
	The obligation to pay principal and interest on any group of Notes is equal to the loan payments, if any, that are received on the corresponding Borrower Loan, net of its 1.0% servicing fee.  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.  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 6 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.
	Servicing rights related to Borrower Loans originated prior to October 16, 2008 do not trade in an active open market with readily observable prices. Although sales of servicing assets do occur, the nature and character of the assets underlying those transactions are not similar to those held by PMI and, therefore, the precise terms and conditions typically seen in the marketplace would likely not be available to PMI. Accordingly, management determined the fair value of its servicing rights using a discounted cash flow model to project future expected cash flows based upon a set of valuation assumptions PMI believes market participants would use for similar rights. The primary assumptions PMI uses for valuing its servicing asset include default rates, estimated servicing income, cost to service, profit margin, and discount rate.
	PMI reviewed these assumptions to ensure they were consistent with market conditions. Inaccurate assumptions in valuing the servicing rights could affect PMI's results of operations. Due to the nature of the valuation inputs, servicing assets are classified as Level 3. The change in the fair-value of servicing rights is included in cost of services in the statement of operations. Servicing rights decreased to zero as loans originated prior to October 16, 2008 had fully matured or charged off as of December 31, 2013.
	The changes in Level 3 assets measured at fair value on a recurring basis are as follows:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Borrower				Notes			Loans			Total
			Loans							Held for
										Investment
	Balance at January 1, 2012		$	75,764			$	(76,160	)	$	137		$	(259	)
	Originations			153,175				(153,175	)		182			182
	Principal repayments			(66,840	)			65,690			(133	)		(1,283	)
	Change in fair value on Borrower Loans and  Notes			4,801				(3,833	)		-			968
	Change in fair value of Loans held for investment			-				-			(11	)		(11	)
	Balance at December 31, 2012		$	166,900			$	(167,478	)	$	175		$	(403	)
	Originations			341,176				(169,742	)		14,296			185,730
	Principal repayments and credit losses			(105,692	)			104,692			(143	)		(1,143	)
	Borrower Loans sold to third parties			(171,290	)			-			(10,410	)		(181,700	)
	Change in fair value on Borrower Loans and  Notes			(4,856	)			5,734			-			878
	Change in fair value of Loans held for investment			-				-			(1	)		(1	)
	Balance at December 31, 2013		$	226,238			$	(226,794	)	$	3,917		$	3,361
	The changes in fair value would directly impact the change in fair value on Borrower Loans, loans held for investment and Notes in the consolidated statements of operations.
	Quantitative information about PMI's Level 3 fair value measurements of its Borrower Loans and Notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to PMI's fair value measurements.
	Assets and Liabilities		Fair			Valuation		Unobservable Inputs
			Value as of			Technique
			31-Dec
	Borrower loans receivable at fair value		$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value		$	(226,794	)	Discounted Cashflow		Default rates and discount rates

Schedule_I_Prosper_Funding_LLC1

Schedule I, Prosper Funding LLC (Policies)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	The accompanying consolidated financial statements include the accounts of PMI and its wholly owned subsidiary Prosper Funding. All intercompany balances and transactions between Prosper Funding and PMI have been eliminated in consolidation. PMI and Prosper Funding's financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).
Use of Estimates	'
	Use of Estimates
	The preparation of 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 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 borrower loans receivable and associated member payment dependent notes, valuation of servicing rights, valuation allowance on deferred tax assets, valuation and amortization periods of intangible assets, repurchase and idemnification obligation, stock-based compensation expense, and contingent liabilities. Estimates are based on historical experience and on various other assumptions that are  believed to be reasonable under the circumstances. Actual results could differ from those estimates.
Certain Risks and Concentrations	'
	Certain Risks and Concentrations
	In the normal course of its business, PMI encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject PMI to significant concentrations of credit risk consist primarily of cash, cash equivalents, restricted cash and short term investments. PMI places cash, cash equivalents, restricted cash and short term investments 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.  PMI 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 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, PMI does not bear the risk on such Borrower Loan.
	PMI 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 PMI's consolidated financial position and results of operations (See Note 12—Commitments and Contingencies—Securities Law Compliance).
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	PMI invests its excess cash primarily in highly liquid debt instruments of the U.S. government and its agencies. All highly liquid investments with stated maturities of three months or less from date of purchase are classified as cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking, money market and short-term certificate of deposit accounts.
Restricted Cash	'
	Restricted Cash
	Restricted cash consists primarily of cash deposits held as collateral as required for loan funding and servicing activities.
Member Loans Sold Directly to Third Party Purchasers [Policy Text Block]	'
	Member Loans Sold Directly to Third Party Purchasers
	For loans sold to unrelated third party purchasers on a servicing retained basis, a gain or loss is recorded on the sale date. In order to calculate the gain or loss, PMI first determines whether the terms of the servicing arrangement with the purchaser results in a net servicing asset (i.e., when contractual/expected servicing revenues adequately compensate PMI) or a net servicing liability (i.e., when contractual/expected servicing revenues do not adequately compensate PMI). When contractual/expected servicing revenues do not adequately compensate PMI, a portion of the gross proceeds of the loans sold on a servicing retained basis are allocated to the recording of a net servicing liability. Conversely, when contractual/expected servicing revenues provide more than adequate compensation to PMI, the excess servicing compensation is allocated to the gross proceeds of the loans sold and results in the recording of a net servicing asset.
	PMI estimates the fair value of the loan servicing asset or liability considering the contractual servicing fee revenue, adequate compensation for PMI's servicing obligation, the current principal balances of the loans and projected servicing revenues given projected defaults and prepayments (if significant) over the remaining lives of the loans. At December 31, 2013, PMI recorded $144 as a servicing asset related to these loans, which is included in Borrower Loans Receivable at fair value on the consolidated balance sheets.
Loans held for investment	'
	Loans held for investment
	Loans held for investment are primarily comprised of loans held for short durations and are recorded at cost which approximates fair value.
Internal Use Software and Website Development	'
	Internal Use Software and Website Development
	PMI 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 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. PMI 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 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 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 asset.
Repurchase and Indemnification Obligation	'
	Repurchase and Indemnification Obligation
	PMI is obligated to indemnify lenders and repurchase certain Notes and member loans sold directly to third party purchasers in the event of violation of applicable federal, state, or local lending laws, or verifiable identify theft. The loan indemnification and repurchase obligation is estimated based on historical experience. PMI accrues a provision for the repurchase and indemnification obligation when the Notes or member loans are issued. Indemnified or repurchased Notes and member loans associated with federal, state, or local lending laws, or verifiable identity thefts are written off at the time of repurchase or at the time an indemnification payment is made.
Revenue Recognition	'
	Revenue Recognition
	Revenue is recognized in accordance with ASC Topic 605, Revenue Recognition.  Under ASC Topic 605, PMI recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the price of the services is fixed and determinable, and collectability is reasonably assured.
	Origination fees
	The company earns an origination fee upon the successful closing of a loan. The borrower receives an amount equal to the loan amount net of the loan origination fee. The loan origination fee is determined by the term and credit grade of the loan, and ranges from 1.00% to 4.95% of the original principal amount. Since PMI accounts for borrower loans, loans held for investment and Notes at fair value, origination fees are not deferred but are recognized at origination of the loan, and direct costs to originate loans are recorded as expenses as incurred.
	Loan servicing fees
	Loan servicing revenue includes monthly loan servicing fees and non-sufficient funds (“NSF”) fees. Loan servicing fees are accrued daily based on the current outstanding loan principal balance of the Borrower Loans but are not recognized until payment is received due to the uncertainty of collection of borrower loan payments. NSF fees are charged to borrowers on the first failed payment of each billing period.  NSF fees are charged to the customer and collected and recognized immediately.
	Interest income on Borrower Loans Receivable and Interest Expense on Notes
	PMI recognizes interest income on Borrower Loans and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent PMI believes it to be collectable.  Below is a table which summarizes the gross interest income and expense for the twelve months ended December 31, 2013 and 2012.
		December 31,
		2013				2012
	Interest income on borrower loans	$	35,526			$	23,101
	Interest expense on notes		(33,072	)			(21,889	)
	Net interest income	$	2,454			$	1,212
Fair Value Measurement	'
	Fair Value Measurement
	PMI adopted ASC Topic 820, Fair Value Measurements and Disclosures, on January 1, 2008. ASC Topic 820 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 but does not expand the use of fair value in any new circumstances.
	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 while the cost basis of certain financial instruments may include initial 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 value of financial instruments 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, short term investments, Borrower Loans receivable, accounts payable and accrued liabilities, Notes and long-term debt.  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, 2013 and 2012:
	31-Dec-13	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable	$	-			$	-		$	226,238		$	226,238
	Certificates of deposit & restricted cash		14,032				1,441			-			15,473
	Loans held for investment		-				-			3,917			3,917
	Liabilities
	Notes	$	-			$	-		$	226,794		$	226,794
	31-Dec-12	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Short term investments	$	1,000			$	-		$	-		$	1,000
	Certificates of deposit & restricted cash		4,331				1,618			-			5,949
	Borrower loans receivable		-				-			166,900			166,900
	Loans held for investment		-				-			175			175
	Liabilities
	Notes	$	-			$	-		$	167,478		$	167,478
	Short term investments consist of United States Treasuries with maturity periods greater than three months and less than 12 months.  In general, fair values determined by Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that PMI has the ability to access. PMI classifies United States Treasuries as Level 1 assets.  PMI intends to hold these investments until maturity.
	As observable market prices are not available for the Borrower Loans and Notes, or for similar assets and liabilities, PMI believes the Borrower Loans and Notes should be considered Level 3 financial instruments under ASC Topic 820.  In a hypothetical transaction as of the measurement date, PMI believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which PMI 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, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, roll rates, recovery rates and discount rates based on the perceived credit risk within each credit grade.
	The obligation to pay principal and interest on any group of Notes is equal to the loan payments, if any, that are received on the corresponding Borrower Loan, net of its 1.0% servicing fee.  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.  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 6 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.
	Servicing rights related to Borrower Loans originated prior to October 16, 2008 do not trade in an active open market with readily observable prices. Although sales of servicing assets do occur, the nature and character of the assets underlying those transactions are not similar to those held by PMI and, therefore, the precise terms and conditions typically seen in the marketplace would likely not be available to PMI. Accordingly, management determined the fair value of its servicing rights using a discounted cash flow model to project future expected cash flows based upon a set of valuation assumptions PMI believes market participants would use for similar rights. The primary assumptions PMI uses for valuing its servicing asset include default rates, estimated servicing income, cost to service, profit margin, and discount rate.
	PMI reviewed these assumptions to ensure they were consistent with market conditions. Inaccurate assumptions in valuing the servicing rights could affect PMI's results of operations. Due to the nature of the valuation inputs, servicing assets are classified as Level 3. The change in the fair-value of servicing rights is included in cost of services in the statement of operations. Servicing rights decreased to zero as loans originated prior to October 16, 2008 had fully matured or charged off as of December 31, 2013.
	The changes in Level 3 assets measured at fair value on a recurring basis are as follows:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes			Loans			Total
		Loans							Held for
									Investment
	Balance at January 1, 2012	$	75,764			$	(76,160	)	$	137		$	(259	)
	Originations		153,175				(153,175	)		182			182
	Principal repayments		(66,840	)			65,690			(133	)		(1,283	)
	Change in fair value on Borrower Loans and  Notes		4,801				(3,833	)		-			968
	Change in fair value of Loans held for investment		-				-			(11	)		(11	)
	Balance at December 31, 2012	$	166,900			$	(167,478	)	$	175		$	(403	)
	Originations		341,176				(169,742	)		14,296			185,730
	Principal repayments and credit losses		(105,692	)			104,692			(143	)		(1,143	)
	Borrower Loans sold to third parties		(171,290	)			-			(10,410	)		(181,700	)
	Change in fair value on Borrower Loans and  Notes		(4,856	)			5,734			-			878
	Change in fair value of Loans held for investment		-				-			(1	)		(1	)
	Balance at December 31, 2013	$	226,238			$	(226,794	)	$	3,917		$	3,361
	The changes in fair value would directly impact the change in fair value on Borrower Loans, loans held for investment and Notes in the consolidated statements of operations.
	Quantitative information about PMI's Level 3 fair value measurements of its Borrower Loans and Notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to PMI's fair value measurements.
	Assets and Liabilities	Fair			Valuation		Unobservable Inputs
		Value as of			Technique
		31-Dec
	Borrower loans receivable at fair value	$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value	$	(226,794	)	Discounted Cashflow		Default rates and discount rates
Prosper Funding LLC [Member]	'
Summary of Significant Accounting Policies [Abstract]	'
Basis of Presentation	'
	Basis of Presentation
	Prosper Funding’s consolidated financial statements include the accounts of Prosper Funding and its wholly-owned subsidiary PAH. All intercompany balances and transactions between Prosper Funding and PAH have been eliminated in consolidation. Prosper Funding's financial statements have been prepared in accordance with U.S generally accepted accounting principles (U.S. GAAP).
Use of Estimates	'
	Use of Estimates
	The preparation of 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 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 borrower loans receivable and associated member payment dependent notes, valuation of servicing rights, and contingent liabilities. Estimates are based on historical experience and on various other assumptions that are believed to be reasonable under the circumstances. Actual results could differ from those estimates.
Certain Risks and Concentrations	'
	Certain Risks and Concentrations
	In the normal course of its business, Prosper Funding encounters two significant types of risk: credit and regulatory. Financial instruments that potentially subject Prosper Funding to significant concentrations of credit risk consist primarily of cash, cash equivalents and restricted cash. Prosper Funding 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. Prosper Funding 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 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, Prosper Funding does not bear the risk on such Borrower Loan.
	Prosper Funding 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 Prosper Funding's financial position and results of operations.
Cash and Cash Equivalents	'
	Cash and Cash Equivalents
	Prosper Funding invests its excess cash primarily in highly liquid debt instruments of the U.S. government and its agencies. All highly liquid investments with stated maturities of three months or less from date of purchase are classified as cash equivalents. Cash equivalents are recorded at cost, which approximates fair value. Such deposits periodically exceed amounts insured by the FDIC. Cash and cash equivalents include various unrestricted deposits with highly rated financial institutions in checking, money market and short-term certificate of deposit accounts.
Restricted Cash	'
	Restricted Cash
	Restricted cash consists primarily of cash deposits held as collateral as required for loan funding and servicing activities.
Borrower Loans and Notes	'
	Borrower Loans and Notes
	Prosper Funding has adopted the provisions of ASC Topic 825, Financial Instrument.  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.  The fair value election, with respect to an item, may not be revoked once an election is made.  In applying the provisions of ASC Topic 825, Prosper Funding records assets and liabilities measured using the fair value option in a way that separates these reported fair values from the carrying values of similar assets and liabilities measured with a different measurement attribute.  Prosper Funding does not record a specific allowance account related to the Borrower Loans and Notes in which it has elected the fair value option, but rather estimate the fair value of the Borrower Loans and Notes using discounted cash flow methodologies adjusted for Prosper Funding’s historical payment, loss and recovery rates. An account is considered to be a loss, or charged-off, when it reaches more than 120 days past due.  Prosper Funding has reported the aggregate fair value of the Borrower Loans and Notes as separate line items in the assets and liabilities sections of the accompanying balance sheets using the methods described in ASC Topic 820, Fair Value Measurements and Disclosures—See Fair Value Measurement.
Member Loans Sold Directly to Third Party Purchasers [Policy Text Block]	'
	Member Loans Sold Directly to Third Party Purchasers
	For Borrower Loans sold to unrelated third party purchasers on a servicing retained basis, a gain or loss is recorded on the sale date. In order to calculate the gain or loss, Prosper Funding first determines whether the terms of the servicing arrangement with the purchaser results in a net servicing asset (i.e., when contractual/expected servicing revenues adequately compensate Prosper Funding) or a net servicing liability (i.e., when contractual/expected servicing revenues do not adequately compensate Prosper Funding). When contractual/expected servicing revenues do not adequately compensate Prosper Funding, a portion of the gross proceeds of the Borrower Loans sold on a servicing retained basis are allocated to the recording of a net servicing liability. Conversely, when contractual/expected servicing revenues provide more than adequate compensation to Prosper Funding, the excess servicing compensation is allocated to the gross proceeds of the Borrower Loans sold and results in the recording of a net servicing asset.
	Prosper Funding estimates the fair value of the loan servicing asset or liability considering the contractual servicing fee revenue, adequate compensation for Prosper Funding’s servicing obligation, the current principal balances of the Borrower Loans and projected servicing revenues given projected defaults and prepayments (if significant) over the remaining lives of the Borrower Loans.
Loans held for investment	'
	Loans held for investment
	Loans held for investment are primarily comprised of loans held for short durations and are recorded at cost which approximates fair value.
Internal Use Software and Website Development	'
	Internal Use Software and Website Development
	Prosper Funding 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 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. Prosper Funding 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 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 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 asset.
Repurchase and Indemnification Obligation	'
	Repurchase and Indemnification Obligation
	Prosper Funding is obligated to indemnify lenders and repurchase certain Notes and member loans sold directly to third party purchasers in the event of violation of applicable federal, state, or local lending laws, or verifiable identify theft. The loan indemnification and repurchase obligation is estimated based on historical experience. Prosper Funding accrues a provision for the repurchase and indemnification obligation when the Notes or member loans are issued. Indemnified or repurchased Notes and member loans associated with federal, state, or local lending laws, or verifiable identity thefts are written off at the time of repurchase or at the time an indemnification payment is made.
Revenue Recognition	'
	Revenue Recognition
	Revenue is recognized in accordance with ASC Topic 605, Revenue Recognition.  Under ASC Topic 605, PMI recognizes revenue when persuasive evidence of an arrangement exists, services have been rendered, the price of the services is fixed and determinable, and collectability is reasonably assured.
	Administration Agreement License Fees
	Prosper Funding primarily generates revenues through license fees it earns through an Administration Agreement with PMI.  The Administration Agreement contains a license granted by Prosper Funding 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.
	Loan servicing fees
	Loan servicing revenue includes monthly loan servicing fees and non-sufficient funds (“NSF”) fees. Loan servicing fees are accrued daily based on the current outstanding loan principal balance of the Borrower Loans but are not recognized until payment is received due to the uncertainty of collection of borrower loan payments. NSF fees are charged to borrowers on the first failed payment of each billing period.  NSF fees are charged to the customer and collected and recognized immediately.
	Interest income on Borrower Loans Receivable and Interest Expense on Notes
	Prosper Funding recognizes interest income on Borrower Loans and interest expense on the corresponding Notes using the accrual method based on the stated interest rate to the extent that is believed it to be collectable.  Below is a table which summarizes the gross interest income on Borrower Loans and expense on Notes for the twelve months ended December 31, 2013 and 2012.
		December 31,
		2013				2012
	Interest income on borrower loans	$	32,862			$	-
	Interest expense on notes		(30,564	)			-
	Net interest income	$	2,298			$	-
Fair Value Measurement	'
	Fair Value Measurement
	Prosper Funding follows ASC Topic 820, Fair Value Measurements and Disclosures, which 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 but does not expand the use of fair value in any new circumstances.
	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 while the cost basis of certain financial instruments may include initial 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 value of financial instruments 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 receivable, 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, 2013 and 2012:
	31-Dec-13	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable	$	-			$	-		$	226,238		$	226,238
	Certificates of deposit and restricted cash		11,028				1,271			-			12,299
	Loans held for investment		-				-			3,917			3,917
	Liabilities
	Notes	$	-			$	-		$	226,794		$	226,794
	31-Dec-12	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Short term investments	$	-			$	-		$	-		$	-
	Certificates of deposit		-				-			-			-
	Borrower loans receivable		-				-			-			-
	Loans held for investment		-				-			-			-
	Liabilities
	Notes	$	-			$	-		$	-		$	-
	As observable market prices are not available for the Borrower Loans and Notes, or for similar assets and liabilities, Prosper Funding believes the Borrower Loans and Notes should be considered Level 3 financial instruments under ASC Topic 820.  In a hypothetical transaction as of the measurement date, Prosper Funding believes that differences in the principal marketplace in which the Borrower Loans are originated and the principal marketplace in which Prosper Funding might offer those loans may result in differences between the originated amount of the Borrower Loans and their fair value as of the transaction date.  For Borrower Loans, the fair value is estimated using discounted cash flow methodologies based upon valuation assumptions including prepayment speeds, roll rates, recovery 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 its 1.0% servicing fee.  The fair value election for Borrower Loans and Notes 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 lender members that are dependent upon borrower payments.  As such, the aggregate fair value of a group of Notes corresponding to a particular Borrower Loan is approximately equal to the fair value of that Borrower Loan, adjusted for the 1.0% servicing fee and the timing of borrower payments subsequently disbursed to such Note holders.  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 6 for a roll-forward and further discussion of the significant assumptions used to value Borrower Loans and Notes.
	The changes in Level 3 assets measured at fair value on a recurring basis are as follows:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes			Loans			Total
		Loans							Held for
									Investment
	Balance at January 1, 2013	$	-			$	-		$	-		$	-
	Assets transferred on February 1, 2013		170,344				(170,574	)		175			(55	)
	Originations		331,353				(159,921	)		14,296			185,728
	Principal repayments and credit losses		(99,313	)			97,967			(143	)		(1,489	)
	Borrower loans sold to third parties		(171,290	)						(10,410	)		(181,700	)
	Change in fair value on borrower loans and notes		(4,856	)			5,734			-			878
	Change in fair value of loans held for investment		-				-			(1	)		(1	)
	Balance at December 31, 2013	$	226,238			$	(226,794	)	$	3,917		$	3,361
	Quantitative information about Prosper Funding’s Level 3 fair value measurements of its borrower loans and notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to Prosper Funding’s fair value measurements.
		Fair			Valuation Technique		Unobservable Inputs
	Assets and	Value as
	Liabilities	of
		December
		31
	Borrower loans receivable at fair value	$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value	$	(226,794	)	Discounted Cashflow		Default rates and discount rates

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Summary of Significant Accounting Policies [Abstract]	'
Estimated useful lives of assets	'
	Depreciation and amortization are computed using the straight-line method based upon estimated useful lives of the assets as follows:
	Furniture and fixtures	7 years
	Office equipment	5 years
	Computers and equipment	3 years
	Leasehold improvements	3 years
	Software	3 years
Summary of gross interest income and expense	'
	Below is a table which summarizes the gross interest income and expense for the twelve months ended December 31, 2013 and 2012.
			December 31,
			2013				2012
	Interest income on borrower loans		$	35,526			$	23,101
	Interest expense on notes			(33,072	)			(21,889	)
	Net interest income		$	2,454			$	1,212
Assets and liabilities measured at fair value	'
	The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2013 and 2012:
	31-Dec-13		Level 1				Level 2			Level 3			Fair Value
			Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable		$	-			$	-		$	226,238		$	226,238
	Certificates of deposit & restricted cash			14,032				1,441			-			15,473
	Loans held for investment			-				-			3,917			3,917
	Liabilities
	Notes		$	-			$	-		$	226,794		$	226,794
	31-Dec-12		Level 1				Level 2			Level 3			Fair Value
			Inputs				Inputs			Inputs
	Assets
	Short term investments		$	1,000			$	-		$	-		$	1,000
	Certificates of deposit & restricted cash			4,331				1,618			-			5,949
	Borrower loans receivable			-				-			166,900			166,900
	Loans held for investment			-				-			175			175
	Liabilities
	Notes		$	-			$	-		$	167,478		$	167,478
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:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
			Borrower				Notes			Loans			Total
			Loans							Held for
										Investment
	Balance at January 1, 2012		$	75,764			$	(76,160	)	$	137		$	(259	)
	Originations			153,175				(153,175	)		182			182
	Principal repayments			(66,840	)			65,690			(133	)		(1,283	)
	Change in fair value on Borrower Loans and  Notes			4,801				(3,833	)		-			968
	Change in fair value of Loans held for investment			-				-			(11	)		(11	)
	Balance at December 31, 2012		$	166,900			$	(167,478	)	$	175		$	(403	)
	Originations			341,176				(169,742	)		14,296			185,730
	Principal repayments and credit losses			(105,692	)			104,692			(143	)		(1,143	)
	Borrower Loans sold to third parties			(171,290	)			-			(10,410	)		(181,700	)
	Change in fair value on Borrower Loans and  Notes			(4,856	)			5,734			-			878
	Change in fair value of Loans held for investment			-				-			(1	)		(1	)
	Balance at December 31, 2013		$	226,238			$	(226,794	)	$	3,917		$	3,361
Summary of fair value measurement, valuation technique	'
	Quantitative information about PMI's Level 3 fair value measurements of its Borrower Loans and Notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to PMI's fair value measurements.
	Assets and Liabilities		Fair			Valuation		Unobservable Inputs
			Value as of			Technique
			31-Dec
	Borrower loans receivable at fair value		$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value		$	(226,794	)	Discounted Cashflow		Default rates and discount rates

Cash_and_Cash_Equivalents_and_1

Cash and Cash Equivalents and Short Term Investments (Tables)	12 Months Ended
	Dec. 31, 2013
Cash and Cash Equivalents and Short Term Investments [Abstract]	'
Cash and cash equivalents and short term investments	'
	Cash and cash equivalents and short term investments consist of the following:
		December 31,
	Cash and cash equivalents and short term investments	2013		2012
	Cash	$	18,339	$	2,300
	Restricted cash		15,473		5,949
	Short term investments		-		1,000
	Total cash and cash equivalents and short term investments	$	33,812	$	9,249

Property_and_Equipment_Tables

Property and Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property and Equipment [Abstract]	'
Property and equipment	'
	Property and equipment consist of the following:
		December 31,
		2013			2012
	Property and equipment:
	Computer equipment	$	2,115		$	1,630
	Internal-use software		3,454			1,656
	Purchased software		375			369
	Office equipment and furniture		39			125
	Leasehold improvements		-			41
	Assets not yet placed in service		651			134
	Property and equipment		6,634			3,955
	Less accumulated depreciation and amortization		(3,238	)		(2,425	)
	Total property and equipment, net	$	3,396		$	1,530

Borrower_Loans_and_Notes_Held_1

Borrower Loans and Notes Held at Fair Value (Tables)	12 Months Ended
	Dec. 31, 2013
Borrower Loans and Notes Held at Fair Value [Abstract]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions	'
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2013 for Borrower Loans and Notes are presented in the following table:
		Borrower Loans			Notes
	Discount rate assumption:		9.77	%*		9.77	%*
	Resulting fair value from:
	100 basis point increase	$	222,989		$	220,362
	200 basis point increase		220,363			217,756
	Resulting fair value from:
	100 basis point decrease	$	228,465		$	225,784
	200 basis point decrease		231,282			228,560
	Default rate assumption:		7.2	%*		7.2	%*
	Resulting fair value from:
	10% higher default rates	$	223,233		$	220,620
	20% higher default rates		220,039			217,439
	Increase in fair value  and income (loss) to earnings from:
	10% lower default rates	$	228,151		$	225,477
	20% lower default rates		230,554			227,866
	* Represents weighted average assumptions considering all Prosper Ratings.

Repurchase_and_Indemnification1

Repurchase and Indemnification Obligation (Tables)	12 Months Ended
	Dec. 31, 2013
Repurchase and Indemnification Obligation [Abstract]	'
Summarized changes in the repurchase obligation	'
	Changes in repurchase and indemnification obligations are summarized below:
		Years Ended December 31,
		2013			2012
	Beginning of year balance:	$	41		$	22
	Provision for repurchases and indemnifications		67			19
	Amounts repurchased and immediately charged off or charged off and indemnified (net of recoveries)		(76	)		-
	End of year balance:	$	32		$	41

Net_Loss_Per_Share_Tables

Net Loss Per Share (Tables)	12 Months Ended
	Dec. 31, 2013
Net Loss Per Share [Abstract]	'
Basic and diluted loss per share	'
	Basic and diluted net loss per share was calculated as follows:
		Years Ended December 31,
		2013			2012
	Numerator:
	Net loss	$	(27,181	)	$	(16,110	)
	Denominator:
	Weighted average shares used in computing basic and diluted net loss per share		6,567,201			2,925,611
	Basic and diluted net loss per share	$	(4.14	)	$	(5.51	)
Dilutive shares excluded from the diluted net loss per share calculation	'
	Due to losses attributable to PMI'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:
		Years Ended December 31,
		2013			2012
	Excluded securities:	(shares)			(shares)
	Convertible preferred stock issued and outstanding		27,274,068			6,195,813
	Stock options issued and outstanding		938,585			1,173,817
	Unvested stock options exercised		6,499,463			-
	Warrants  issued and outstanding		218,810			260,987
	Total common stock equivalents excluded from diluted net loss per common share computation		34,930,926			7,630,617

Stockholders_Equity_Tables

Stockholders' Equity (Tables)	12 Months Ended
	Dec. 31, 2013
Stockholders' Equity [Abstract]	'
Convertible Preferred Stock	'
	In September 2013, PMI issued and sold 8,288,734 shares of new Series B (“new Series B”) preferred stock in a private placement at a purchase price of $3.02 per share for approximately $24,880, net of issuance costs.
	Convertible Preferred Stock	Par Value		Authorized,		Balance		Liquidation
				Issued and		December		Preference
				Outstanding		31, 2013
				shares as of
				December 31,
				2013
	New Series A		0.01		13,868,152		139	$	20,000
	Series A-1		0.01		5,117,182		51		51,172
	New Series B		0.01		8,288,734		83		25,000
					27,274,068	$	273	$	96,172

Stock_Option_Plan_and_Compensa1

Stock Option Plan and Compensation (Tables)	12 Months Ended
	Dec. 31, 2013
Stock Option Plan and Compensation [Abstract]	'
Summarized option activity under option plan	'
	The share amounts and share price reflect a 10-for-1 reverse stock split effected by the Company on October 29, 2013.
			Options				Weighted-
			Issued				Average
			and				Exercise
			Outstanding				Price
	Balance as of January 1, 2012			1,208,762			$	2.08
	Options granted (weighted average fair value of $1.05)			288,796				1.7
	Options exercised - vested			(13,389	)			1.42
	Options exercised - nonvested			-				-
	Options canceled			(310,353	)			1.9
	Balance as of December 31, 2012			1,173,816			$	2.03
	Balance as of January 1, 2013			1,173,816			$	2.03
	Options granted (weighted average fair value of $0. 07)			7,912,933				0.1
	Options exercised - vested			(828,496	)			0.2
	Options exercised - nonvested			(6,499,463	)			0.1
	Options canceled			(820,205	)			1.77
	Balance as of December 31, 2013			938,585			$	1.39
	Options outstanding and exercisable at December 31, 2013			575,258			$	1.87
Fair value of stock option awards	'
	The fair value of stock option awards for the years 2013 and 2012 was estimated at the date of grant using the Black-Scholes model with the following average assumptions:
			Years Ended December 31,
			2013				2012
	Volatility of common stock			73.3	%			73.3	%
	Risk-free interest rate			1.9	%			1.3	%
	Expected life*		5.8 years				4.6 years
	Dividend yield			0	%			0	%
	Weighted-average fair value of grants		$	0.07			$	0.1
	* For nonemployee stock option awards, the expected life is the contractual term of the award, which is generally ten years.
Additional information regarding common stock options outstanding	'
	Additional information regarding common stock options outstanding as of December 31, 2013 is as follows:
					Options Outstanding										Options Vested and Exercisable
	Exercise				Number				Weighted		Weighted Avg.		Intrinsic		Number		Weighted		Intrinsic
	Prices				Outstanding				Avg.		Exercise Price		Value		Exercisable		Avg.		Value
									Remaining								Exercise
									Life								Price
	$	0.1				288,689				9.62	$	0.1	$	-		57,721	$	0.1	$	-
		1.2				171,181				7.71		1.2		–		126,007		1.2		–
		1.7				144,791				8.37		1.7		–		64,934		1.7		–
		2				300,074				6.56		2		–		292,746		2		–
		2.5				1,500				1.55		2.5		–		1,500		2.5		–
		5				11,000				2.67		5		–		11,000		5		–
		5.6				18,250				5.71		5.6		–		18,250		5.6		–
		19.4				3,100				5.04		19.4		–		3,100		19.4		–
						938,585				7.91	$	1.39	$	–		575,258	$	1.36	$	–

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Taxes [Abstract]	'
Effective income tax reconciliation	'
	PMI did not have any current or deferred federal or state income tax expense for the years ended December 31, 2013 and 2012.  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:
		Years Ended December 31,
		2013			2012
	Federal tax at statutory rate		34	%		34	%
	State tax at statutory rate (net of federal benefit)		2	%		2	%
	Change in valuation allowance		(38	)%		(36	)%
	Other		2	%		0	%
			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, 2013 and 2012 are as follows:
		December 31,
		2013			2012
	Net operating loss carryforwards	$	39,872		$	29,394
	Research & other credits		660			527
	Fixed assets		(23	)		21
	Accrued liabilities and other		350			289
			40,859			30,231
	Fair value of loans		(1,051	)		(618	)
	Valuation allowance		(39,808	)		(29,613	)
	Net deferred tax asset	$	-		$	-
Unrecognized tax benefits	'
	The following table summarizes the Company's activity related to its unrecognized tax benefits:
		December 31,			December 31,
		2013			2012
	Balance at January 1, 2013	$	186		$	-
	Increase related to current year tax position		33			-
	Increase related to tax position of prior years		8			186
	Balance at December 31, 2013	$	227		$	186

Commitments_and_Contingencies_

Commitments and Contingencies (Tables)	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies [Abstract]	'
Future minimum rental payments	'
	Future minimum rental payments under these leases as of December 31, 2013 are as follows:
	Year ending December 31:	2013
	2014	$	502
	2015		-
	Total future operating lease obligations	$	502

Related_Parties_Tables

Related Parties (Tables)	12 Months Ended
	Dec. 31, 2013
Related Parties [Abstract]	'
Aggregate amount of loans 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 PMI Group as of December 31, 2013 and 2012 are summarized below:
	Related Party	Aggregate Amount of				Income Earned on
		Notes and Borrower				Notes and Borrower
		Loans				Loans
		Purchased
		2013		2012		2013		2012
	Executive officers and management	$	1,387	$	139	$	90	$	7
	Directors		622		3,996		255		334
		$	2,009	$	4,135	$	345	$	341

Schedule_I_Prosper_Funding_LLC2

Schedule I, Prosper Funding LLC (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Statements, Captions [Line Items]	'
Summary of gross interest income and expense	'
	Below is a table which summarizes the gross interest income and expense for the twelve months ended December 31, 2013 and 2012.
		December 31,
		2013				2012
	Interest income on borrower loans	$	35,526			$	23,101
	Interest expense on notes		(33,072	)			(21,889	)
	Net interest income	$	2,454			$	1,212
Assets and liabilities measured at fair value	'
	The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2013 and 2012:
	31-Dec-13	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable	$	-			$	-		$	226,238		$	226,238
	Certificates of deposit & restricted cash		14,032				1,441			-			15,473
	Loans held for investment		-				-			3,917			3,917
	Liabilities
	Notes	$	-			$	-		$	226,794		$	226,794
	31-Dec-12	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Short term investments	$	1,000			$	-		$	-		$	1,000
	Certificates of deposit & restricted cash		4,331				1,618			-			5,949
	Borrower loans receivable		-				-			166,900			166,900
	Loans held for investment		-				-			175			175
	Liabilities
	Notes	$	-			$	-		$	167,478		$	167,478
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:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes			Loans			Total
		Loans							Held for
									Investment
	Balance at January 1, 2012	$	75,764			$	(76,160	)	$	137		$	(259	)
	Originations		153,175				(153,175	)		182			182
	Principal repayments		(66,840	)			65,690			(133	)		(1,283	)
	Change in fair value on Borrower Loans and  Notes		4,801				(3,833	)		-			968
	Change in fair value of Loans held for investment		-				-			(11	)		(11	)
	Balance at December 31, 2012	$	166,900			$	(167,478	)	$	175		$	(403	)
	Originations		341,176				(169,742	)		14,296			185,730
	Principal repayments and credit losses		(105,692	)			104,692			(143	)		(1,143	)
	Borrower Loans sold to third parties		(171,290	)			-			(10,410	)		(181,700	)
	Change in fair value on Borrower Loans and  Notes		(4,856	)			5,734			-			878
	Change in fair value of Loans held for investment		-				-			(1	)		(1	)
	Balance at December 31, 2013	$	226,238			$	(226,794	)	$	3,917		$	3,361
Summary of fair value measurement, valuation technique	'
	Quantitative information about PMI's Level 3 fair value measurements of its Borrower Loans and Notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to PMI's fair value measurements.
	Assets and Liabilities	Fair			Valuation		Unobservable Inputs
		Value as of			Technique
		31-Dec
	Borrower loans receivable at fair value	$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value	$	(226,794	)	Discounted Cashflow		Default rates and discount rates
Cash and cash equivalents and short term investments	'
	Cash and cash equivalents and short term investments consist of the following:
		December 31,
	Cash and cash equivalents and short term investments	2013				2012
	Cash	$	18,339			$	2,300
	Restricted cash		15,473				5,949
	Short term investments		-				1,000
	Total cash and cash equivalents and short term investments	$	33,812			$	9,249
Property and equipment	'
	Property and equipment consist of the following:
		December 31,
		2013				2012
	Property and equipment:
	Computer equipment	$	2,115			$	1,630
	Internal-use software		3,454				1,656
	Purchased software		375				369
	Office equipment and furniture		39				125
	Leasehold improvements		-				41
	Assets not yet placed in service		651				134
	Property and equipment		6,634				3,955
	Less accumulated depreciation and amortization		(3,238	)			(2,425	)
	Total property and equipment, net	$	3,396			$	1,530
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions	'
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2013 for Borrower Loans and Notes are presented in the following table:
		Borrower Loans				Notes
	Discount rate assumption:		9.77	%*			9.77	%*
	Resulting fair value from:
	100 basis point increase	$	222,989			$	220,362
	200 basis point increase		220,363				217,756
	Resulting fair value from:
	100 basis point decrease	$	228,465			$	225,784
	200 basis point decrease		231,282				228,560
	Default rate assumption:		7.2	%*			7.2	%*
	Resulting fair value from:
	10% higher default rates	$	223,233			$	220,620
	20% higher default rates		220,039				217,439
	Increase in fair value  and income (loss) to earnings from:
	10% lower default rates	$	228,151			$	225,477
	20% lower default rates		230,554				227,866
	* Represents weighted average assumptions considering all Prosper Ratings.
Summarized changes in the repurchase obligation	'
	Changes in repurchase and indemnification obligations are summarized below:
		Years Ended December 31,
		2013				2012
	Beginning of year balance:	$	41			$	22
	Provision for repurchases and indemnifications		67				19
	Amounts repurchased and immediately charged off or charged off and indemnified (net of recoveries)		(76	)			-
	End of year balance:	$	32			$	41
Prosper Funding LLC [Member]	'
Condensed Financial Statements, Captions [Line Items]	'
Summary of gross interest income and expense	'
	Below is a table which summarizes the gross interest income on Borrower Loans and expense on Notes for the twelve months ended December 31, 2013 and 2012.
		December 31,
		2013				2012
	Interest income on borrower loans	$	32,862			$	-
	Interest expense on notes		(30,564	)			-
	Net interest income	$	2,298			$	-
Assets and liabilities measured at fair value	'
	The following tables present the assets and liabilities measured at fair value on a recurring basis at December 31, 2013 and 2012:
	31-Dec-13	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Borrower loans receivable	$	-			$	-		$	226,238		$	226,238
	Certificates of deposit and restricted cash		11,028				1,271			-			12,299
	Loans held for investment		-				-			3,917			3,917
	Liabilities
	Notes	$	-			$	-		$	226,794		$	226,794
	31-Dec-12	Level 1				Level 2			Level 3			Fair Value
		Inputs				Inputs			Inputs
	Assets
	Short term investments	$	-			$	-		$	-		$	-
	Certificates of deposit		-				-			-			-
	Borrower loans receivable		-				-			-			-
	Loans held for investment		-				-			-			-
	Liabilities
	Notes	$	-			$	-		$	-		$	-
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:
	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
		Borrower				Notes			Loans			Total
		Loans							Held for
									Investment
	Balance at January 1, 2013	$	-			$	-		$	-		$	-
	Assets transferred on February 1, 2013		170,344				(170,574	)		175			(55	)
	Originations		331,353				(159,921	)		14,296			185,728
	Principal repayments and credit losses		(99,313	)			97,967			(143	)		(1,489	)
	Borrower loans sold to third parties		(171,290	)						(10,410	)		(181,700	)
	Change in fair value on borrower loans and notes		(4,856	)			5,734			-			878
	Change in fair value of loans held for investment		-				-			(1	)		(1	)
	Balance at December 31, 2013	$	226,238			$	(226,794	)	$	3,917		$	3,361
Summary of fair value measurement, valuation technique	'
	Quantitative information about Prosper Funding’s Level 3 fair value measurements of its borrower loans and notes as of December 31, 2013 is provided below.  The table is not intended to be all-inclusive, but rather provides information on the significant Level 3 inputs as they relate to Prosper Funding’s fair value measurements.
		Fair			Valuation Technique		Unobservable Inputs
	Assets and	Value as
	Liabilities	of
		December
		31
	Borrower loans receivable at fair value	$	226,238		Discounted Cashflow		Default rates and discount rates
	Notes at fair value	$	(226,794	)	Discounted Cashflow		Default rates and discount rates
Cash and cash equivalents and short term investments	'
	Cash and cash equivalents consist of the following:
		December 31,
	Cash and cash equivalents	2013				2012
	Cash in bank	$	5,789			$	5
	Total cash and cash equivalents	$	5,789			$	5
Property and equipment	'
	Property and equipment consist of the following:
		December 31,
		2013				2012
	Property and equipment:
	Internal-use software	$	3,454			$	-
	Property and equipment		3,454				-
	Less accumulated depreciation and amortization		(1,474	)
	Total property and equipment, net	$	1,980			$	-
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions	'
	Key economic assumptions and the sensitivity of the current fair value to immediate adverse changes in those assumptions at December 31, 2013 for Borrower Loans and Notes are presented in the following table:
		Borrower Loans				Notes
	Discount rate assumption:		9.77	%*			9.77	%*
	Resulting fair value from:
	100 basis point increase	$	222,989			$	220,362
	200 basis point increase		220,363				217,756
	Resulting fair value from:
	100 basis point decrease	$	228,465			$	225,784
	200 basis point decrease		231,282				228,560
	Default rate assumption:		7.2	%*			7.2	%*
	Resulting fair value from:
	10% higher default rates	$	223,233			$	220,620
	20% higher default rates		220,039				217,439
	Increase in fair value  and income (loss) to earnings from:
	10% lower default rates	$	228,151			$	225,477
	20% lower default rates		230,554				227,866
	* Represents weighted average assumptions considering all Prosper Ratings.
Summarized changes in the repurchase obligation	'
	Changes in Prosper Funding’s repurchase and indemnification obligations are summarized below:
		Years Ended December 31,
		2013				2012
	Beginning of year balance:	$	-			$	-
	Provision for repurchases and indemnifications		41				-
	Amounts repurchased and immediately charged off or charged off and indemnified (net of recoveries)		(9	)			-
	End of year balance:	$	32			$	-

Organization_and_Business_Deta

Organization and Business (Details) (USD $)	12 Months Ended		0 Months Ended	1 Months Ended	0 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Jan. 15, 2013	Jan. 31, 2013	Jan. 15, 2013	Sep. 23, 2013
			Series A Preferred Stock [Member]	Series A Preferred Stock [Member]	Series A1 Preferred Stock [Member]	Series B Preferred Stock [Member]
Organization and Business [Abstract]	'	'	'	'	'	'
Loan listings, minimum	$2	'	'	'	'	'
Loan listings, maximum	35	'	'	'	'	'
Loan term, description	'three or five years	'	'	'	'	'
Accumulated deficit	104,080	76,899	'	'	'	'
Cash and cash equivalents and short term investments	18,339	'	'	'	'	'
Class of Stock [Line Items]	'	'	'	'	'	'
Shares issued (in shares)	'	'	13,868,152	13,868,152	5,117,182	8,288,734
Proceeds from issuance of preferred stock	$45,000	$0	'	$19,844	$19,841	$24,930
Purchase price (in dollars per share)	'	'	$1.44	'	$0.01	$3.02

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Details) (USD $)	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
	Risk
Certain Risks and Concentrations [Abstract]	'		'
Number of significant types of risks	2		'
Cash and Cash Equivalents [Abstract]	'		'
Cash and cash equivalents, maximum	'3 months		'
Short Term Investments [Abstract]	'		'
Highly liquid debt instruments maturity period, minimum	'3 months		'
Highly liquid debt instruments maturity period, maximum	'12 months		'
Borrower Loans and Notes [Abstract]	'		'
Maximum number of days past due an account is considered to be a loss, or charged off	'120 days		'
Member Loans Sold Directly to Third Party Purchasers [Abstract]	'		'
Servicing assets	$144		'
Impairment of Long-Lived Assets Including Acquired Intangible Assets [Abstract]	'		'
Impairment charges	62		0
Net Interest income on Borrower Loans Receivable and Payment Dependent Notes [Abstract]	'		'
Interest Income on Borrower Loans	35,526		23,101
Interest Expense on Notes	-33,072		-21,889
Net Interest Income	2,454		1,212
Marketing and Advertising Expense [Abstract]	'		'
Advertising costs	14,851		5,683
Stock-Based Compensation [Abstract]	'		'
Vesting period of the award	'4 years		'
Estimated annual forfeiture rate (in hundredths)	17.20%		18.20%
Fair value of stock option awards [Abstract]	'		'
Volatility of common stock (in hundredths)	73.30%		73.30%
Risk-free interest rate (in hundredths)	1.90%		1.30%
Expected life	'5 years 9 months 18 days	[1]	'4 years 7 months 6 days	[1]
Dividend yield (in hundredths)	0.00%		0.00%
Weighted-average fair value of grants (in dollars per share)	$0.07		$0.10
Contractual term	'10 years		'
Stock-based compensation expense	229		340
Unamortized expense related to unvested stock-based awards	991		'
Remaining weighted average vesting period	'4 years 2 months 12 days		'
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)	34,930,926		7,630,617
Assets	'		'
Short Term Investments	'		1,000
Borrower Loans receivable	226,238		166,900
Certificates of Deposit & Restricted Cash	15,473		5,949
Borrower Loans held for investment	3,917		175
Liabilities	'		'
Notes	226,794		167,478
Servicing fee (in hundredths)	1.00%		'
Level 1 Inputs [Member]	'		'
Assets	'		'
Short Term Investments	'		1,000
Borrower Loans receivable	0		0
Certificates of Deposit & Restricted Cash	14,033		4,331
Borrower Loans held for investment	0		0
Liabilities	'		'
Notes	0		0
Level 2 Inputs [Member]	'		'
Assets	'		'
Short Term Investments	'		0
Borrower Loans receivable	0		0
Certificates of Deposit & Restricted Cash	1,441		1,618
Borrower Loans held for investment	0		0
Liabilities	'		'
Notes	0		0
Level 3 Inputs [Member]	'		'
Assets	'		'
Short Term Investments	'		0
Borrower Loans receivable	226,238		166,900
Certificates of Deposit & Restricted Cash	0		0
Borrower Loans held for investment	3,917		175
Liabilities	'		'
Notes	$226,794		$167,478
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)	27,274,068		6,195,813
Stock Options [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)	938,585		1,173,817
Warrants [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)	'		261
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]	'		'
Property, Plant and Equipment [Line Items]	'		'
Property and equipment, estimated useful life	'3 years		'
Software [Member]	'		'
Property, Plant and Equipment [Line Items]	'		'
Property and equipment, estimated useful life	'3 years		'
[1]	For nonemployee stock option awards, the expected life is the contractual term of the award, which is generally ten years.

Summary_of_Significant_Account4

Summary of Significant Accounting Policies, Assets Level 3 Reconciliation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Total	($403)	($260)
Originations, Total	185,730	182
Principal repayments and credit losses, Total	-1,143	-1,283
Loans sold to third parties, Total	-181,700	'
Change in fair value on borrower loans and Payment Dependent Notes, Total	878	969
Change in fair value of loans held for investment, Total	-1	-11
Ending balance, Total	3,361	-403
Notes [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Liabilities	-167,478	-76,160
Originations, Liabilities	-169,742	-153,175
Principal repayments and credit losses, Liabilities	104,692	65,690
Loans sold to third parties, Liabilities	0	'
Change in fair value on borrower loans and Payment Dependent Notes, Liabilities	5,734	-3,833
Change in fair value of loans held for investment, Liability	0	0
Ending balance, Liabilities	-226,794	-167,478
Borrower Loans [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	166,900	75,763
Originations, Assets	341,176	153,175
Principal repayments and credit losses, Assets	-105,692	-66,840
Loans sold to third parties	-171,290	'
Change in fair value on Borrower Loans and Notes, Assets	-4,856	4,802
Change in fair value of loans held for investment, Asset	0	0
Ending balance, Assets	226,238	166,900
Loans Held for Investment [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	175	137
Originations, Assets	14,296	182
Principal repayments and credit losses, Assets	-143	-133
Loans sold to third parties	-10,410	'
Change in fair value on Borrower Loans and Notes, Assets	0	0
Change in fair value of loans held for investment, Asset	-1	-11
Ending balance, Assets	$3,917	$175

Summary_of_Significant_Account5

Summary of Significant Accounting Policies, Fair Value Measurements, Recurring and Nonrecurring Valuations (Details) (Fair Value, Measurements, Recurring [Member], Level 3 Inputs [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Notes [Member]	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'
Borrower notes at fair value	($226,794)
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates
Borrower Loans [Member]	'
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items]	'
Borrower loans receivable at fair value	$226,238
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates

Cash_and_Cash_Equivalents_and_2

Cash and Cash Equivalents and Short Term Investments (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Cash and cash equivalents and short term investments [Abstract]	'	'
Cash	$18,339	$2,300
Restricted Cash	15,473	5,949
Short term investments	0	1,000
Total cash and cash equivalents and short term investments	$33,812	$9,249

Property_and_Equipment_Details

Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property and equipment [Abstract]	'	'
Property and equipment, Gross	$6,635	$3,955
Less accumulated depreciation and amortization	-3,238	-2,425
Total property and equipment, net	3,396	1,530
Depreciation expense	961	679
Capitalized internal-use software costs	1,797	530
Computers equipment [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	2,116	1,630
Internal-use software [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	3,454	1,656
Purchased software [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	375	369
Office equipment and furniture [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	39	125
Leasehold improvements [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	0	41
Assets not yet placed in service [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	$651	$134

Loans_Held_for_Investment_Deta

Loans Held for Investment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Loans Held for Investment [Abstract]	'	'
PMI Borrower loans originated	$14,296	'
Proceeds from sale of loans held-for-investment to third party	10,410	'
Loans held for investment	3,917	175
Adjustment in fair value of loans held for investment	1	-11
Repayment of Loans held for investment at fair value	143	'
Loans receivable held for investment, charge offs	$14	'

Borrower_Loans_and_Notes_Held_2

Borrower Loans and Notes Held at Fair Value, Fair Value Assumptions, Borrower Loans (Details) (Borrower Loans [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Discount rate assumption [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Discount rate assumption [Member] | 100 Basis Point Increase [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	222,989
Discount rate assumption [Member] | 200 Basis Point Increase [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	220,363
Discount rate assumption [Member] | 100 Basis Point Decrease [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	228,465
Discount rate assumption [Member] | 200 Basis Point Decrease [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	231,282
Default rate assumption [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Default rate assumption (in hundredths)	7.20%	[1]
Default rate assumption [Member] | 10% Higher [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	223,233
Default rate assumption [Member] | 20% Higher [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	220,039
Default rate assumption [Member] | 10% Lower [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	228,151
Default rate assumption [Member] | 20% Lower [Member]	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'
Borrower loans	230,554
[1]	Represents weighted average assumptions considering all Prosper Ratings.

Borrower_Loans_and_Notes_Held_3

Borrower Loans and Notes Held at Fair Value, Fair Value Assumptions, Notes (Details) (Notes [Member], USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Discount rate assumption [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Discount rate assumption [Member] | 100 Basis Point Increase [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,362
Discount rate assumption [Member] | 200 Basis Point Increase [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,756
Discount rate assumption [Member] | 100 Basis Point Decrease [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,784
Discount rate assumption [Member] | 200 Basis Point Decrease [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	228,560
Default rate assumption [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Default rate assumption (in hundredths)	7.20%	[1]
Default rate assumption [Member] | 10% Higher [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,620
Default rate assumption [Member] | 20% Higher [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,439
Default rate assumption [Member] | 10% Lower [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,477
Default rate assumption [Member] | 20% Lower [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	227,866
[1]	Represents weighted average assumptions considering all Prosper Ratings.

Borrower_Loans_and_Notes_Held_4

Borrower Loans and Notes Held at Fair Value, Fair Value Measurements Using Significant Unobservable Inputs (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
	Loan
Borrower Loans and Notes Held at Fair Value [Abstract]	'
Servicing fee as percentage of outstanding principal balance of borrower loan (in hundredths)	1.00%
Number of Loans 90 Days or More Delinquent	332
Minimum number of days for which loans originated were delinquent	'90 days
Aggregate principal amount of loans originated	$1,941,439
Fair value of loans originated	$174,620

Repurchase_and_Indemnification2

Repurchase and Indemnification Obligation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Repurchase and Indemnification Obligation [Abstract]	'	'
Beginning of year balance	$41	$22
Provision for repurchases and indemnifications	67	19
Notes repurchased and immediately charged off or charged off and indemnified (net of recoveries)	-76	0
End of year balance	32	41
Provision for repurchases and indemnification obligation	$118	$26

Net_Loss_Per_Share_Details

Net Loss Per Share (Details) (USD $)	2 Months Ended	12 Months Ended
In Thousands, except Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012
Numerator [Abstract]	'	'	'
Net loss	'	($27,181)	($16,110)
Denominator [Abstract]	'	'	'
Weighted average shares used in computing basic and diluted net loss per share (in shares)	'	6,567,201	2,925,611
Basic and diluted net loss per share (in dollars per share)	'	($4.14)	($5.51)
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)	'	34,930,926	7,630,617
Reverse stock split, shares issued (in shares)	1	'	'
Reverse stock split, shares converted (in shares)	10	'	'
Convertible preferred stock 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)	'	27,274,068	6,195,813
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)	'	938,585	1,173,817
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)	'	6,499,463	0
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)	'	218,810	260,987

Stockholders_Equity_Details

Stockholders' Equity (Details) (USD $)

2 Months Ended

12 Months Ended

2 Months Ended

2 Months Ended

0 Months Ended

1 Months Ended

2 Months Ended

0 Months Ended

12 Months Ended

1 Months Ended

12 Months Ended

0 Months Ended

1 Months Ended

12 Months Ended

2 Months Ended

12 Months Ended

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Oct. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Oct. 29, 2013

Dec. 31, 2013

Dec. 31, 2013

Jan. 15, 2013

Jan. 31, 2013

Dec. 31, 2013

Oct. 29, 2013

Sep. 23, 2013

Dec. 31, 2013

Oct. 29, 2013

Jan. 31, 2013

Dec. 31, 2013

Sep. 23, 2013

Jan. 31, 2013

Dec. 31, 2013

Jan. 15, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Oct. 29, 2013

Dec. 31, 2013

Sep. 30, 2013

Preferred Stock [Member]

Preferred Stock [Member]

Series A '13 Convertible Preferred Stock [Member]

Series A-1 '13 Convertible Preferred Stock [Member]

Series A-1 Preferred Stock [Member]

Series A-1 Preferred Stock [Member]

Series B '13 Convertible Preferred Stock [Member]

Series A and B '13 Convertible Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series A Preferred Stock [Member]

Series B Preferred Stock [Member]

Series B Preferred Stock [Member]

Series B Preferred Stock [Member]

Series A 1 Convertible Preferred Stock [Member]

Series A 1 Convertible Preferred Stock [Member]

Series A 1 [Member]

Series A 1 [Member]

Series A 1 [Member]

Series A 1 [Member]

Series D Preferred Stock [Member]

Series E Preferred Stock [Member]

Series F Preferred Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock [Member]

Common Stock Warrant [Member]

Common Stock Warrant [Member]

Class of Stock [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Shares issued (in shares)

'

'

'

'

'

'

'

'

'

'

'

13,868,152

13,868,152

'

'

8,288,734

'

'

5,117,182

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock, price per share (in dollars per share)

'

'

'

$0.01

'

'

'

'

'

'

'

'

$1.44

'

'

$3.02

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Proceeds from issuance of preferred stock

'

$45,000,000

$0

'

'

'

'

'

'

'

'

'

$19,844,000

'

'

$24,930,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Converted ratio from preferred stock to common stock

1

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

Common stock convertible ratio if preferred stock did not participate

10

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reverse stock split, shares issued (in shares)

1

'

'

1

'

'

'

1

'

'

'

'

'

1

'

'

1

'

'

'

'

'

'

'

'

'

'

1

'

'

'

'

'

Reverse stock split, shares converted (in shares)

10

'

'

10

'

'

'

10

'

'

'

'

'

10

'

'

10

'

'

'

'

'

'

'

'

'

'

10

'

'

'

'

'

Convertible Preferred Stock [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, par value (in dollars per share)

$0.01

$0.01

$0.01

'

'

$0.01

$0.01

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock, Balance

0

0

72,000

'

'

139,000

51,000

'

'

83,000

273,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, shares authorized (in shares)

7,195,813

7,195,813

7,195,813

'

27,274,068

13,868,152

5,117,182

'

5,117,182

8,288,734

27,274,068

'

'

'

13,868,152

'

'

8,288,734

'

'

'

'

'

'

'

'

'

'

'

'

41,487,465

'

'

Convertible preferred stock, shares issued (in shares)

7,195,813

7,195,813

7,195,813

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock, shares outstanding (in shares)

7,195,813

7,195,813

7,195,813

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Convertible preferred stock, liquidation preference

51,172

51,172

0

'

'

20,000,000

51,172,000

'

'

25,000,000

96,172,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred Stock, Value, Issued

0

0

72,000

'

'

139,000

51,000

'

'

83,000

273,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Dividends

0

0

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Preferred stock, annual dividend rate (in hundredths)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

8.00%

8.00%

8.00%

'

'

'

'

'

'

Conversion [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Conversion of old preferred stock into common stock

1

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Liquidation preference per share (in dollars per share)

'

'

'

'

'

$1.44

'

'

'

$3.02

'

'

'

'

'

'

'

'

'

'

'

'

'

$1

'

'

'

'

'

'

'

'

'

Value prior to closing of underwritten initial public offering

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

200,000,000

'

'

'

'

'

200,000,000

'

'

'

'

'

'

'

'

'

'

'

Aggregate proceeds to the entity before deducting underwriters commissions and expenses

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

40,000,000

'

'

'

'

'

40,000,000

'

'

'

'

'

'

'

'

'

'

'

Percentage of holders of preferred stock required to request for conversion, minimum (in hundredths)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

60.00%

'

'

'

'

14.00%

70.00%

'

'

'

'

'

'

'

'

'

'

'

Conversion ratio of preferred stock into prosper common stock

'

'

'

'

'

'

'

'

'

'

'

'

'

1

'

1

'

'

'

1,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

Liquidation Rights [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Amount per share receivable pursuant to liquidation (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

Common Stock [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Common stock, shares authorized (in shares)

41,487,465

41,487,465

8,263,000

'

'

'

'

'

'

'

'

'

'

'

'

8,288,734

'

'

'

'

'

'

'

'

'

'

'

'

'

'

68,761,533

41,487,465,000

41,487,465

Common stock, par value (in dollars per share)

$0.01

$0.01

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.01

$0.01

Common stock, shares issued (in shares)

13,720,214

13,720,214

300,674

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,406,539

13,799,063

Common stock, shares outstanding (in shares)

13,720,214

13,720,214

300,674

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

13,406,539

13,799,063

Common Stock Issued upon Exercise of Stock Options [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise of stock options (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

7,327,959

13,388

'

'

'

Cash proceeds from exercise of options

'

210,000

19,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

864,000

19,000

'

'

'

Exercise of nonvested stock options (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

6,499,463

0

'

'

'

Stock repurchase upon termination of employment (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

100,509

0

'

'

'

Stock repurchase upon termination of employment

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$41,000

$0

'

'

'

Common Stock Issued upon Exercise of Stock Warrants [Abstract]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise of common stock warrants (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

820

0

'

'

'

Exercise of common stock warrants (in dollars per share)

$0.01

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Stock_Option_Plan_and_Compensa2

Stock Option Plan and Compensation (Details) (USD $)

2 Months Ended

12 Months Ended

12 Months Ended

In Thousands, except Share data, unless otherwise specified

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2013

Dec. 31, 2012

Dec. 31, 2011

Dec. 31, 2005

0.10 [Member]

1.20 [Member]

1.70 [Member]

2.00 [Member]

2.50 [Member]

5.00 [Member]

5.60 [Member]

19.40 [Member]

Incentive Stock Options [Member]

Non-statutory Stock Options [Member]

2005 Stock Option Plan [Member]

2005 Stock Option Plan [Member]

2005 Stock Option Plan [Member]

2005 Stock Option Plan [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Percentage of entity common stock held by stockholders on option grant date, minimum (in hundredths)

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price as percentage of fair value of entity common stock if stockholders hold minimum 10% of entity stock, minimum (in hundredths)

'

110.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Vesting period of the options

'

'4 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options exercisable, maximum period

'

'10 years

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise price as percentage of fair value of entity's common stock on grant date, minimum (in hundredths)

'

'

'

'

'

'

'

'

'

'

'

100.00%

85.00%

'

'

'

'

Number of options made available in pool (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

12,634,791

1,523,966

135,396

187,946

Additional number of options made available in pool (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

11,110,825

170,000

455,087

'

Shares available for grant under the plan

0

0

'

'

'

'

'

'

'

'

'

'

'

5,414,052

'

'

'

Reverse stock split, shares issued (in shares)

1

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Reverse stock split, shares converted (in shares)

10

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options Issued and Outstanding [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

1,173,816

1,208,762

'

'

Options granted (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

7,912,933

288,796

'

'

Options exercised - vested (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

-828,496

-13,389

'

'

Options exercised - nonvested (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

-6,499,463

0

'

'

Options canceled (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

-820,205

-310,353

'

'

Ending balance (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

938,585

1,173,816

1,208,762

'

Options outstanding and exercisable (in shares)

'

'

'

'

'

'

'

'

'

'

'

'

'

575,258

'

'

'

Weighted-Average Exercise Price [Roll Forward]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Beginning balance (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$2.03

$2.08

'

'

Options granted (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.10

$1.70

'

'

Options exercised - vested (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.20

$1.42

'

'

Options exercised - nonvested (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$0.10

$0

'

'

Options canceled (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.77

$1.90

'

'

Ending balance (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.39

$2.03

$2.08

'

Options outstanding and exercisable (in dollars per share)

'

'

'

'

'

'

'

'

'

'

'

'

'

$1.87

'

'

'

Weighted average fair value (in dollars per share)

$1.05

$1.05

$0.07

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options Outstanding

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Exercise Prices

'

'

'

$0.10

$1.20

$1.70

$2

$2.50

$5

$5.60

$19.40

'

'

'

'

'

'

Number Outstanding (in shares)

938,585

938,585

'

288,689

171,181

144,791

300,074

1,500

11,000

18,250

3,100

'

'

'

'

'

'

Weighted Avg. Remaining Life

'

'7 years 10 months 28 days

'

'9 years 7 months 13 days

'7 years 8 months 16 days

'8 years 4 months 13 days

'6 years 6 months 22 days

'1 year 6 months 18 days

'2 years 8 months 1 day

'5 years 8 months 16 days

'5 years 0 months 14 days

'

'

'

'

'

'

Weighted Avg. Exercise Price (in dollars per share)

$1.39

$1.39

'

$0.10

$1.20

$1.70

$2

$2.50

$5

$5.60

$19.40

'

'

'

'

'

'

Intrinsic Value

$0

$0

'

$0

$0

$0

$0

$0

$0

$0

$0

'

'

'

'

'

'

Options Exercisable

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number Exercisable (in shares)

575,258

575,258

'

57,721

126,007

64,934

292,746

1,500

11,000

18,250

3,100

'

'

'

'

'

'

Weighted Avg. Exercise Price (in dollars per share)

$1.36

$1.36

'

$0.10

$1.20

$1.70

$2

$2.50

$5

$5.60

$19.40

'

'

'

'

'

'

Intrinsic Value

$0

$0

'

$0

$0

$0

$0

$0

$0

$0

$0

'

'

'

'

'

'

Common stock value (in dollars per share)

$0.01

$0.01

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding vested and expected to vest (in shares)

777,148

777,148

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Options outstanding vested and expected to vest, weighted-average contractual life

'

'10 years 10 months 10 days

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Income_Taxes_Details

Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Effective income tax rate reconciliation [Abstract]	'	'
Federal tax at statutory rate (in hundredths)	34.00%	34.00%
State tax at statutory rate (net of federal benefit) (in hundredths)	2.00%	2.00%
Change in valuation allowance (in hundredths)	-38.00%	-36.00%
Other (in hundredths)	2.00%	0.00%
Total (in hundredths)	0.00%	0.00%
Deferred tax assets and liabilities [Abstract]	'	'
Net operating loss carryforwards	$39,872,000	$29,394,000
Research & other credit	660,000	527,000
Fixed assets	-23,000	21,000
Accrued liabilities and other	350,000	289,000
Total	40,859,000	30,231,000
Fair Value of Loans	-1,051,000	-618,000
Deferred Tax Assets Liabilities Gross	39,808,000	29,613,000
Valuation allowance	-39,808,000	-29,613,000
Net deferred tax asset	0	0
Valuation allowance percentage change (in hundredths)	34.00%	'
Net current deferred tax asset	188,000	116,000
Net noncurrent deferred tax asset	39,620,000	29,497,000
Valuation allowance as percentage of net deferred tax asset (in hundredths)	100.00%	'
Unrecognized tax benefits [Roll Forward]	'	'
Beginning balance	186,000	0
Increase related to current year tax position	33,000	0
Increase/(decrease) related to tax position of prior years	8,000	186,000
Ending balance	227,000	186,000
Unrecognized tax benefits that would affect effective tax rate	188,000	'
Federal [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss	101,798,000	'
Operating loss carryforwards, expiration period	'2025	'
Tax Credit Carryforward [Line Items]	'	'
Tax credit carryforward, expiration period	'2025	'
Other Tax Carryforward [Line Items]	'	'
Tax year subject to examination	'2009	'
Federal [Member] | Capital Loss Carryforward [Member]	'	'
Other Tax Carryforward [Line Items]	'	'
Capital loss carryforwards	674,000	'
Capital loss carryforwards, expiration period	'2012	'
Federal [Member] | Research Tax Credit Carryforward [Member]	'	'
Tax Credit Carryforward [Line Items]	'	'
Research and development tax credits	445,000	'
State [Member]	'	'
Operating Loss Carryforwards [Line Items]	'	'
Net operating loss	92,109,000	'
Operating loss carryforwards, expiration period	'2015	'
California [Member]	'	'
Other Tax Carryforward [Line Items]	'	'
Tax year subject to examination	'2009	'
California [Member] | Capital Loss Carryforward [Member]	'	'
Other Tax Carryforward [Line Items]	'	'
Capital loss carryforwards	674,000,000	'
Capital loss carryforwards, expiration period	'2012	'
California [Member] | Research Tax Credit Carryforward [Member]	'	'
Tax Credit Carryforward [Line Items]	'	'
Research and development tax credits	$466,000	'

Commitments_and_Contingencies_1

Commitments and Contingencies (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Oct. 22, 2012	Nov. 30, 2008	Oct. 16, 2008
	Installment
	State
Years ended December 31 [Abstract]	'	'	'	'	'
2014	$502	'	'	'	'
2015	0	'	'	'	'
Total future operating lease obligations	502	'	'	'	'
Rental expense under premises-operating lease arrangements	633	532	'	'	'
Securities Law Compliance [Abstract]	'	'	'	'	'
Amount of loans sold to lender members	'	'	'	'	178,000
Statute of limitations for noncompliance to register securities	'The federal statute of limitations for noncompliance with the requirement to register securities under the Securities Act is one year from the violation, although the statute of limitations period under various state laws may be for a longer period of time.	'	'	'	'
Aggregate amount of payment for penalties	'	'	'	1,000	'
Number of states with which company entered into consent order	34	'	'	'	'
Aggregate amount paid by entity for penalties to states	466	'	'	'	'
Accrued contingent liability associated with states not entered into consent orders	248	248	'	'	'
Past and future defense costs received from Greenwich	'	2,000	'	'	'
Pre-judgment interest amount received	'	'	143	'	'
Claims filed, appeal to resend court findings against Greenwhich	2,000	'	'	'	'
Number of annual installments paid to plaintiffs	4	'	'	'	'
Settlement installment due in 2013	2,000	'	'	'	'
Settlement installment due in 2014	2,000	'	'	'	'
Settlement installment due in 2015	3,000	'	'	'	'
Settlement installment due in 2016	3,000	'	'	'	'
Legal settlement liability	$10,000	$0	'	'	'

Related_Parties_Details

Related Parties (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Related Parties [Abstract]	'	'
Minimum percentage of voting securities considered for related parties (in hundredths)	5.00%	'
Minimum amount of transaction with related parties	$6,174	'
Aggregate amount of PMI Notes and loans purchased and the income earned [Abstract]	'	'
Aggregate Amount of PMI Notes and Loans Purchased	0	0
Income Earned on PMI Notes and Loans	0	0
Aggregate amount of notes purchased, amount charge off	385	236
Aggregate amount of notes purchased, percentage charge off (in hundredths)	6.00%	6.00%
Servicing fees revenue earned by entity	21	18
Executive Officers & Management [Member]	'	'
Aggregate amount of PMI Notes and loans purchased and the income earned [Abstract]	'	'
Aggregate Amount of PMI Notes and Loans Purchased	1,387	139
Income Earned on PMI Notes and Loans	90	7
Directors [Member]	'	'
Aggregate amount of PMI Notes and loans purchased and the income earned [Abstract]	'	'
Aggregate Amount of PMI Notes and Loans Purchased	622	3,996
Income Earned on PMI Notes and Loans	$255	$334

Postretirement_Benefit_Plans_D

Postretirement Benefit Plans (Details)	12 Months Ended
	Dec. 31, 2013
Postretirement Benefit Plans [Abstract]	'
Deferred compensation arrangement with eligible employees, percentage (in hundredths)	90.00%

Schedule_I_Prosper_Funding_LLC3

Schedule I, Prosper Funding LLC, Consolidated Balance Sheet (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
ASSETS	'	'	'
Cash and cash equivalents	$18,339	$2,300	$9,216
Restricted Cash	15,473	5,949	'
Loans held for investment	3,917	175	'
Borrower loans receivable at fair value	226,238	166,900	'
Property and equipment, net	3,396	1,530	'
Total Assets	268,289	178,322	'
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'	'
Notes at fair value	226,794	167,478	'
Note repurchase and indemnification obligation	32	41	22
Total Liabilities	244,172	172,285	'
Member's Equity	'	'	'
Retained earnings (accumulated deficit)	-104,080	-76,899	'
Total Member's equity	24,117	6,037	21,730
Total Liabilities and Member's Equity	268,289	178,322	'
Prosper Funding LLC [Member]	'	'	'
ASSETS	'	'	'
Cash and cash equivalents	5,789	5	0
Restricted Cash	12,299	0	'
Loans held for investment	3,917	0	'
Borrower loans receivable at fair value	226,238	0	'
Property and equipment, net	1,980	0	'
Other Assets	14	0	'
Total Assets	250,237	5	'
LIABILITIES AND STOCKHOLDERS' EQUITY	'	'	'
Accounts payable and accrued liabilities	3,712	0	'
Notes at fair value	226,794	0	'
Note repurchase and indemnification obligation	32	0	0
Related party payable	205	0	'
Total Liabilities	230,743	0	'
Member's Equity	'	'	'
Members Equity	16,076	210	'
Retained earnings (accumulated deficit)	3,418	-205	'
Total Member's equity	19,494	5	0
Total Liabilities and Member's Equity	$250,237	$5	'

Schedule_I_Prosper_Funding_LLC4

Schedule I, Prosper Funding LLC, Consolidated Statement of Operations (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenues	'	'	'
Interest Income on Borrower Loans	$35,526	$23,101	'
Total Revenues	17,391	6,808	'
Cost of Revenues	'	'	'
Cost of services	-2,056	-1,421	'
Provision for repurchase indemnification obligation	-118	-26	'
Net Revenues	15,217	5,361	'
Operating expenses	'	'	'
Depreciation and amortization	961	679	'
Professional services	1,979	3,307	'
Other operating expenses	1,733	1,580	'
Total Operating Expenses	44,429	22,811	'
Income (Loss) Before Other Income and Expenses	-29,212	-17,450	'
Other Income and Expenses	'	'	'
Change in fair value on borrower loans, loans held for investment and notes, net	877	957	'
Other Income	1,151	369	'
Total Other Income and Expenses, net	2,031	1,340	'
Loss (loss) Before Income Taxes	-27,181	-16,110	'
Provision for income taxes	0	0	'
Total Net Income (loss)	-27,181	-16,110	'
Prosper Funding LLC [Member]	'	'	'
Revenues	'	'	'
Administration Fee Revenue	7,632	0	'
Interest Income on Borrower Loans	32,862	0	'
Interest Expense on Notes	-30,564	0	'
Total Revenues	9,930	0	'
Cost of Revenues	'	'	'
Cost of services	-1,270	0	'
Provision for repurchase indemnification obligation	-83	0	'
Net Revenues	8,577	0	'
Operating expenses	'	'	'
Administration fee expense	5,053	0	'
Depreciation and amortization	538	0	0
Professional services	26	114	'
Other operating expenses	242	91	'
Total Operating Expenses	5,859	205	'
Income (Loss) Before Other Income and Expenses	2,718	-205	'
Other Income and Expenses	'	'	'
Change in fair value on borrower loans, loans held for investment and notes, net	877	0	'
Other Income	28	0	'
Total Other Income and Expenses, net	905	0	'
Loss (loss) Before Income Taxes	3,623	-205	'
Provision for income taxes	0	0	'
Total Net Income (loss)	$3,623	($205)	($205)

Schedule_I_Prosper_Funding_LLC5

Schedule I, Prosper Funding LLC, Consolidated Statements of Member's Equity (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Consolidated Statements of Member's Equity [Abstract]	'	'	'
Balance	$6,037	$21,730	'
Net Income (loss)	-27,181	-16,110	'
Balance	24,117	6,037	'
Retained Earnings (Accumulated Deficit) [Member]	'	'	'
Consolidated Statements of Member's Equity [Abstract]	'	'	'
Balance	-76,899	-60,789	'
Net Income (loss)	-27,181	-16,110	'
Balance	-104,080	-76,899	'
Prosper Funding LLC [Member]	'	'	'
Consolidated Statements of Member's Equity [Abstract]	'	'	'
Balance	5	0	'
Transfer of assets from PMI	5,865	'	'
Capital infusion from parent	10,001	210	'
Net Income (loss)	3,623	-205	-205
Balance	19,494	5	0
Prosper Funding LLC [Member] | Member's Equity [Member]	'	'	'
Consolidated Statements of Member's Equity [Abstract]	'	'	'
Balance	210	0	'
Transfer of assets from PMI	5,865	'	'
Capital infusion from parent	10,001	210	'
Net Income (loss)	0	0	'
Balance	16,076	210	'
Prosper Funding LLC [Member] | Retained Earnings (Accumulated Deficit) [Member]	'	'	'
Consolidated Statements of Member's Equity [Abstract]	'	'	'
Balance	-205	0	'
Transfer of assets from PMI	0	'	'
Capital infusion from parent	0	0	'
Net Income (loss)	3,623	-205	'
Balance	$3,418	($205)	'

Schedule_I_Prosper_Funding_LLC6

Schedule I, Prosper Funding LLC, Consolidated Statement of Cash Flows (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Cash flows from Operating Activities:	'	'	'
Net Income (loss)	($27,181)	($16,110)	'
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Change in fair value of Notes	-5,734	3,833	'
Change in fair value of Borrower Loans	4,856	-4,801	'
Depreciation and amortization	961	679	'
Loan loss reserve	-9	19	'
Change in fair value of Loans held for investment	1	11	'
Changes in operating assets and liabilities:	'	'	'
Restricted cash	-9,524	-1,585	'
Accounts payable and accrued liabilities	1,971	1,615	'
Net cash used in operating activities	-24,826	-16,162	'
Cash Flows from Investing Activities:	'	'	'
Origination of Borrower Loans held at fair value	-341,176	-153,175	'
Repayment of Borrower Loans held at fair value	105,692	66,840	'
Proceeds from sale of borrower loans held at fair value	171,290	0	'
Purchases of property and equipment	-2,889	-872	'
Repayment of Loans held for investment at fair value	143	133	'
Origination of Loans held for investment at fair value	-14,296	-182	'
Proceeds from sale of loans held for investment at fair value	10,410	'	'
Net cash used in investing activities	-69,826	-78,258	'
Cash Flows from Financing Activities:	'	'	'
Proceeds from issuance of Notes held at fair value	169,742	153,175	'
Payment of Notes held at fair value	-104,692	-65,690	'
Net cash provided by financing activities	110,691	87,504	'
Net increase in cash and cash equivalents	16,039	-6,916	'
Cash and cash equivalents at beginning of the year	2,300	9,216	'
Cash and cash equivalents at end of the year	18,339	2,300	'
Prosper Funding LLC [Member]	'	'	'
Cash flows from Operating Activities:	'	'	'
Net Income (loss)	3,623	-205	-205
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:	'	'	'
Change in fair value of Notes	-5,734	'	0
Change in fair value of Borrower Loans	4,856	'	0
Depreciation and amortization	538	0	0
Loan loss reserve	-9	'	0
Change in fair value of Loans held for investment	1	'	0
Changes in operating assets and liabilities:	'	'	'
Restricted cash	-8,155	'	0
Other assets	-13	'	0
Accounts payable and accrued liabilities	2,933	'	0
Net related party payable	205	'	0
Net cash used in operating activities	-1,755	'	-205
Cash Flows from Investing Activities:	'	'	'
Origination of Borrower Loans held at fair value	-331,353	'	0
Repayment of Borrower Loans held at fair value	99,313	'	0
Proceeds from sale of borrower loans held at fair value	171,290	'	0
Purchases of property and equipment	-1,798	'	0
Repayment of Loans held for investment at fair value	143	'	0
Origination of Loans held for investment at fair value	-14,296	'	0
Proceeds from sale of loans held for investment at fair value	10,410	'	0
Net cash used in investing activities	-66,291	'	0
Cash Flows from Financing Activities:	'	'	'
Proceeds from issuance of Notes held at fair value	159,921	'	0
Payment of Notes held at fair value	-97,967	'	0
Members' Equity capital infusion from parent	10,001	'	210
Net cash included in transfer of assets from PMI	1,875	'	0
Net cash provided by financing activities	73,830	'	210
Net increase in cash and cash equivalents	5,784	'	5
Cash and cash equivalents at beginning of the year	5	0	'
Cash and cash equivalents at end of the year	5,789	5	0
Supplemental disclosure of cash flow information:	'	'	'
Restricted cash	4,144	0	'
Loans held for investment	175	0	'
Borrower loans at fair value	170,343	0	'
Property and equipment, net	721	0	'
Accrued liabilities	-779	0	'
Notes at fair value	-170,573	0	'
Loan repurchase obligation	-41	0	'
Non-cash transfer	3,990	0	'
Cash transferred	1,875	0	'
Transfer Of Assets Net Acquired	$5,865	$0	'

Schedule_I_Prosper_Funding_LLC7

Schedule I, Prosper Funding LLC, Notes to Financial Statements (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Risk
Organization and Business [Abstract]	'	'	'
Loan term, description	'three or five years	'	'
Certain Risks and Concentrations [Abstract]	'	'	'
Number of significant types of risks	2	'	'
Interest Income on Borrower Loans Receivable and Interest Expense on Notes [Abstract]	'	'	'
Interest Income on Borrower Loans	$35,526	$23,101	'
Net Interest Income	2,454	1,212	'
Cash and Cash Equivalents and Short Term Investments [Abstract]	'	'	'
Cash in bank	18,339	2,300	'
Total cash and cash equivalents	18,339	2,300	9,216
Prosper Funding LLC [Member]	'	'	'
Organization and Business [Abstract]	'	'	'
Loan term, description	'three or five years	'	'
Certain Risks and Concentrations [Abstract]	'	'	'
Number of significant types of risks	2	'	'
Loans Servicing Fee [Abstract]	'	'	'
Funding's service fee (in hundredths)	1.00%	'	'
Interest Income on Borrower Loans Receivable and Interest Expense on Notes [Abstract]	'	'	'
Interest Income on Borrower Loans	32,862	0	'
Interest Expense on Notes	-30,564	0	'
Net Interest Income	2,298	0	'
Cash and Cash Equivalents and Short Term Investments [Abstract]	'	'	'
Cash in bank	5,789	5	'
Total cash and cash equivalents	$5,789	$5	$0

Schedule_I_Prosper_Funding_LLC8

Schedule I, Prosper Funding LLC, Fair Value Measurement (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Assets [Abstract]	'	'
Short Term Investments	'	$1,000
Borrower Loans receivable	226,238	166,900
Borrower Loans held for investment	3,917	175
Liabilities	'	'
Notes	226,794	167,478
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Total	-403	-260
Originations, Total	185,730	182
Principal repayments and credit losses, Total	-1,143	-1,283
Loans sold to third parties, Total	-181,700	'
Change in fair value on Borrower Loans and Notes, Total	878	969
Change in fair value of loans held for investment, Total	-1	-11
Ending balance, Total	3,361	-403
Notes [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Liabilities	-167,478	-76,160
Originations, Liabilities	-169,742	-153,175
Principal repayments and credit losses, Liabilities	104,692	65,690
Change in fair value on Borrower Loans and Notes, Liabilities	-5,734	3,833
Change in fair value of loans held for investment, Liability	0	0
Ending balance, Liabilities	-226,794	-167,478
Borrower Loans [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	166,900	75,763
Originations	341,176	153,175
Principal repayments and credit losses, Assets	-105,692	-66,840
Loans sold to third parties	-171,290	'
Change in fair value on Borrower Loans and Notes, Assets	-4,856	4,802
Change in fair value of loans held for investment, Asset	0	0
Ending balance, Assets	226,238	166,900
Loans Held for Investment [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	175	137
Originations	14,296	182
Principal repayments and credit losses, Assets	-143	-133
Loans sold to third parties	-10,410	'
Change in fair value on Borrower Loans and Notes, Assets	0	0
Change in fair value of loans held for investment, Asset	-1	-11
Ending balance, Assets	3,917	175
Level 1 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	1,000
Borrower Loans receivable	0	0
Borrower Loans held for investment	0	0
Liabilities	'	'
Notes	0	0
Level 2 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Borrower Loans receivable	0	0
Borrower Loans held for investment	0	0
Liabilities	'	'
Notes	0	0
Level 3 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Borrower Loans receivable	226,238	166,900
Borrower Loans held for investment	3,917	175
Liabilities	'	'
Notes	226,794	167,478
Recurring [Member] | Level 3 Inputs [Member] | Notes [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Borrower notes at fair value	-226,794	'
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow	'
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates	'
Recurring [Member] | Level 3 Inputs [Member] | Borrower Loans [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Borrower loans receivable at fair value	226,238	'
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow	'
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates	'
Prosper Funding LLC [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Certificates of Deposit and restricted cash	12,299	0
Borrower Loans receivable	226,238	0
Borrower Loans held for investment	3,917	0
Liabilities	'	'
Notes	226,794	0
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Total	0	'
Assets transferred, Total	-55	'
Originations, Total	185,728	'
Principal repayments and credit losses, Total	-1,489	'
Loans sold to third parties, Total	-181,700	'
Change in fair value on Borrower Loans and Notes, Total	878	'
Change in fair value of loans held for investment, Total	-1	'
Ending balance, Total	3,361	'
Prosper Funding LLC [Member] | Notes [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Liabilities	0	'
Transfers	-170,574	'
Originations, Liabilities	-159,921	'
Principal repayments and credit losses, Liabilities	97,967	'
Change in fair value on Borrower Loans and Notes, Liabilities	5,734	'
Change in fair value of loans held for investment, Liability	0	'
Ending balance, Liabilities	-226,794	'
Prosper Funding LLC [Member] | Borrower Loans [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	0	'
Assets transferred	170,344	'
Originations	331,353	'
Principal repayments and credit losses, Assets	-99,313	'
Loans sold to third parties	-171,290	'
Change in fair value on Borrower Loans and Notes, Assets	-4,856	'
Change in fair value of loans held for investment, Asset	0	'
Ending balance, Assets	226,238	'
Prosper Funding LLC [Member] | Loans Held for Investment [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Beginning balance, Assets	0	'
Assets transferred	175	'
Originations	14,296	'
Principal repayments and credit losses, Assets	-143	'
Loans sold to third parties	-10,410	'
Change in fair value on Borrower Loans and Notes, Assets	0	'
Change in fair value of loans held for investment, Asset	-1	'
Ending balance, Assets	3,917	'
Prosper Funding LLC [Member] | Level 1 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Certificates of Deposit and restricted cash	11,028	0
Borrower Loans receivable	0	0
Borrower Loans held for investment	0	0
Liabilities	'	'
Notes	0	0
Prosper Funding LLC [Member] | Level 2 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Certificates of Deposit and restricted cash	1,271	0
Borrower Loans receivable	0	0
Borrower Loans held for investment	0	0
Liabilities	'	'
Notes	0	0
Prosper Funding LLC [Member] | Level 3 Inputs [Member]	'	'
Assets [Abstract]	'	'
Short Term Investments	'	0
Certificates of Deposit and restricted cash	0	0
Borrower Loans receivable	226,238	0
Borrower Loans held for investment	3,917	0
Liabilities	'	'
Notes	226,794	0
Prosper Funding LLC [Member] | Recurring [Member] | Level 3 Inputs [Member] | Notes [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Borrower notes at fair value	-226,794	'
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow	'
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates	'
Prosper Funding LLC [Member] | Recurring [Member] | Level 3 Inputs [Member] | Borrower Loans [Member]	'	'
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]	'	'
Borrower loans receivable at fair value	$226,238	'
Valuation Techniques, Discounted Cash Flow	'Discounted Cashflow	'
Fair Value Measurements, Unobservable Inputs	'Default rates and discount rates	'

Schedule_I_Prosper_Funding_LLC9

Schedule I, Prosper Funding LLC, Property and Equipment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Property and equipment [Abstract]	'	'
Property and equipment, Gross	$6,635	$3,955
Less accumulated depreciation and amortization	-3,238	-2,425
Total property and equipment, net	3,396	1,530
Depreciation expense	961	679
Capitalized internal-use software costs	1,797	530
Prosper Funding LLC [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	3,454	0
Less accumulated depreciation and amortization	-1,474	'
Total property and equipment, net	1,980	0
Depreciation expense	538	0
Capitalized internal-use software costs	1,798	0
Internal-use software [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	3,454	1,656
Internal-use software [Member] | Prosper Funding LLC [Member]	'	'
Property and equipment [Abstract]	'	'
Property and equipment, Gross	$3,454	$0

Recovered_Sheet1

Schedule I, Prosper Funding LLC, Loans Held for Investment (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Loans Held for Investment [Abstract]	'	'	'
PMI Borrower loans originated	$14,296	'	'
Proceeds from sale of loans held-for-investment to third party	10,410	'	'
Loans held for investment	3,917	175	'
Repayment of Loans held for investment at fair value	143	'	'
Loans receivable held for investment, charge offs	14	'	'
Prosper Funding LLC [Member]	'	'	'
Loans Held for Investment [Abstract]	'	'	'
PMI Borrower loans originated	14,296	'	'
Proceeds from sale of loans held-for-investment to third party	10,410	'	0
Loans held for investment	3,917	0	'
Adjustment in fair value of Loans held for investment	-1	0	'
Repayment of Loans held for investment at fair value	143	'	'
Loans receivable held for investment, charge offs	14	'	'
Loans Held for Investment [Member]	'	'	'
Loans Held for Investment [Abstract]	'	'	'
Adjustment in fair value of Loans held for investment	($1)	($11)	'

Recovered_Sheet2

Schedule I, Prosper Funding LLC, Borrower Loans and Notes Held at Fair Value (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
	Loan
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Servicing fee as percentage of outstanding principal balance of borrower loan (in hundredths)	1.00%
Number of loans originated	332
Minimum number of days for which loans originated were delinquent	'90 days
Aggregate principal amount of loans originated	$1,941,439
Fair value of loans originated	174,620
Discount rate assumption [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Discount rate assumption [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,362
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	222,989
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,756
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	220,363
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,784
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	228,465
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	228,560
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	231,282
Default rate assumption [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Default rate assumption (in hundredths)	7.20%	[1]
Default rate assumption [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Default rate assumption (in hundredths)	7.20%	[1]
Default rate assumption [Member] | 10% Higher [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,620
Default rate assumption [Member] | 10% Higher [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	223,233
Default rate assumption [Member] | 20% Higher [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,439
Default rate assumption [Member] | 20% Higher [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	220,039
Default rate assumption [Member] | 10% Lower [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,477
Default rate assumption [Member] | 10% Lower [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	228,151
Default rate assumption [Member] | 20% Lower [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	227,866
Default rate assumption [Member] | 20% Lower [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	230,554
Prosper Funding LLC [Member] | Discount rate assumption [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Prosper Funding LLC [Member] | Discount rate assumption [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Discount rate assumption (in hundredths)	9.77%	[1]
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,362
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	222,989
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,756
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	220,363
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,784
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	228,465
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	228,560
Prosper Funding LLC [Member] | Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	231,282
Prosper Funding LLC [Member] | Default rate assumption [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Default rate assumption (in hundredths)	7.20%	[1]
Prosper Funding LLC [Member] | Default rate assumption [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Default rate assumption (in hundredths)	7.20%	[1]
Prosper Funding LLC [Member] | Default rate assumption [Member] | 10% Higher [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	220,620
Prosper Funding LLC [Member] | Default rate assumption [Member] | 10% Higher [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	223,233
Prosper Funding LLC [Member] | Default rate assumption [Member] | 20% Higher [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	217,439
Prosper Funding LLC [Member] | Default rate assumption [Member] | 20% Higher [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	220,039
Prosper Funding LLC [Member] | Default rate assumption [Member] | 10% Lower [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	225,477
Prosper Funding LLC [Member] | Default rate assumption [Member] | 10% Lower [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	228,151
Prosper Funding LLC [Member] | Default rate assumption [Member] | 20% Lower [Member] | Notes [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Notes	227,866
Prosper Funding LLC [Member] | Default rate assumption [Member] | 20% Lower [Member] | Borrower Loans [Member]	'
Key economic assumptions and sensitivity of current fair value to immediate adverse changes in those assumptions [Abstract]	'
Borrower loans	$230,554
[1]	Represents weighted average assumptions considering all Prosper Ratings.

Recovered_Sheet3

Schedule I, Prosper Funding LLC, Repurchase and Indemnification Obligation (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Repurchase and Indemnification Obligation [Abstract]	'	'
Beginning of year balance	$41	$22
Provision for repurchases and indemnifications	67	19
Notes repurchased and immediately charged off or charged off and indemnified (net of recoveries)	-76	0
End of year balance	32	41
Prosper Funding LLC [Member]	'	'
Repurchase and Indemnification Obligation [Abstract]	'	'
Beginning of year balance	0	0
Provision for repurchases and indemnifications	41	0
Notes repurchased and immediately charged off or charged off and indemnified (net of recoveries)	-9	0
End of year balance	32	0
Provision for Loan Losses	$83	$0

Recovered_Sheet4

Schedule I, Prosper Funding LLC, Income Taxes (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Income tax reconciliation [Abstract]	'	'
Net effective tax rate (in hundredths)	0.00%	0.00%
Prosper Funding LLC [Member]	'	'
Income tax reconciliation [Abstract]	'	'
Net effective tax rate (in hundredths)	0.00%	0.00%