Prosper Marketplace 10-Q 15 Aug 16 2016 Q2 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	6 Months Ended
	Jun. 30, 2016	Aug. 04, 2016
Document And Entity Information [Line Items]
Entity Registrant Name	PROSPER MARKETPLACE, INC
Entity Central Index Key	1,416,265
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		69,744,201
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2016
Prosper Funding LLC [Member]
Document And Entity Information [Line Items]
Entity Registrant Name	Prosper Funding LLC
Entity Central Index Key	1,542,574
Current Fiscal Year End Date	--12-31
Entity Filer Category	Smaller Reporting Company
Entity Common Stock, Shares Outstanding		0

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Cash and Cash Equivalents	$ 28,824	$ 66,295
Restricted Cash	133,216	151,223
Available for Sale Investments, at Fair Value	55,713	73,187
Accounts Receivable	870	2,434
Loans Held for Sale, at Fair Value	4,705	32
Borrower Loans, at Fair Value	310,034	297,273
Property and Equipment, Net	28,178	24,965
Prepaid and Other Assets	6,747	6,433
Servicing Assets	14,297	14,363
Goodwill	36,368	36,368
Intangibles Assets, Net	11,076	13,051
Total Assets	630,028	685,624
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Accounts Payable and Accrued Liabilities	13,104	22,409
Payable to Investors	114,876	136,507
Notes at Fair Value	309,530	297,405
Other Liabilities	24,416	20,735
Total Liabilities	461,926	477,056
Commitments and Contingencies (see Note 16)
Convertible Preferred Stock – $0.01 par value; 177,388,425 shares authorized, issued and outstanding as of June 30, 2016 and December 31, 2015. Aggregate liquidation preference of $325,952 as of June 30, 2016 and December 31, 2015.	275,938	275,938
Stockholders' Deficit
Common Stock ($0.01 par value; 298,222,103 shares authorized, 70,893,225 issued and 69,957,290 outstanding as of June 30, 2016; and 270,326,075 shares authorized, 70,367,425 shares issued and 69,431,490 outstanding as of December 31, 2015)	174	127
Additional Paid-In Capital	115,325	102,971
Less: Treasury Stock (5,177,235 common shares at cost, June 30, 2016 and December 31, 2015)	(23,417)	(23,417)
Accumulated Deficit	(199,996)	(146,907)
Accumulated Other Comprehensive Income/(Loss)	78	(144)
Total Stockholders' Deficit	(107,836)	(67,370)
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit	630,028	685,624
Prosper Funding LLC [Member]
Assets
Cash and Cash Equivalents	6,911	15,026
Restricted Cash	121,933	139,937
Short Term Investments	1,279	1,277
Loans Held for Sale, at Fair Value	4,705	32
Borrower Loans, at Fair Value	310,034	297,273
Property and Equipment, Net	9,854	8,419
Servicing Assets	13,798	13,605
Other assets	111	122
Total Assets	468,625	475,691
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Accounts Payable and Accrued Liabilities	1,371	2,122
Payable to Related Party	4,202	2,989
Payable to Investors	113,610	135,661
Notes at Fair Value	309,530	297,405
Other Liabilities	1,283	1,209
Total Liabilities	429,996	439,386
Stockholders' Deficit
Accumulated Deficit	38,629	36,305
Total Stockholders' Deficit	38,629	36,305
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit	$ 468,625	$ 475,691

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Statement Of Financial Position [Abstract]
Convertible preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Convertible preferred stock, shares authorized (in shares)	177,388,425	177,388,425
Convertible preferred stock, shares issued (in shares)	177,388,425	177,388,425
Convertible preferred stock, shares outstanding (in shares)	177,388,425	177,388,425
Convertible preferred stock, aggregate liquidation preference	$ 325,952	$ 325,952
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	298,222,103	270,326,075
Common stock, shares issued (in shares)	70,893,225	70,367,425
Common stock, shares outstanding (in shares)	69,957,290	69,431,490
Treasury Stock, Shares	5,177,235	5,177,235

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations (Unaudited) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Operating Revenues
Transaction Fees, Net	$ 19,276,000	$ 39,800,000	$ 61,100,000	$ 65,142,000
Servicing Fees, Net	7,676,000	3,575,000	14,819,000	6,144,000
Gain (Loss) on Sale of Borrower Loans	(687,000)	3,696,000	3,104,000	5,618,000
Other Revenue	816,000	1,630,000	3,589,000	2,685,000
Total Operating Revenues	27,081,000	48,701,000	82,612,000	79,589,000
Interest Income
Interest Income on Borrower Loans	11,192,000	10,165,000	21,975,000	20,634,000
Interest Expense on Notes	(10,098,000)	(9,448,000)	(19,819,000)	(19,011,000)
Net Interest Income	1,094,000	717,000	2,156,000	1,623,000
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	(2,000)	95,000	(79,000)	21,000
Total Net Revenue	28,173,000	49,513,000	84,689,000	81,233,000
Expenses
Origination and Servicing	8,833,000	7,126,000	19,282,000	13,982,000
Sales and Marketing	12,303,000	26,580,000	45,023,000	45,150,000
General and Administrative	28,499,000	21,832,000	59,145,000	35,329,000
Restructuring Charges	14,061,000		14,061,000
Total Expenses	63,696,000	55,538,000	137,511,000	94,461,000
Net Loss Before Taxes	(35,523,000)	(6,025,000)	(52,822,000)	(13,228,000)
Income Tax Expense	105,000	176,000	270,000	249,000
Total Net Income	(35,628,000)	(6,201,000)	(53,092,000)	(13,477,000)
Net Loss Applicable to Common Stockholders	$ (35,628,000)	$ (6,201,000)	$ (53,092,000)	$ (13,477,000)
Net Loss Per Share – Basic and Diluted	$ (0.56)	$ (0.11)	$ (0.86)	$ (0.25)
Weighted-Average Shares - Basic and Diluted	63,270,058	55,612,485	61,813,773	54,168,175
Prosper Funding LLC [Member]
Operating Revenues
Administration Fee Revenue - Related Party	$ 6,930,000	$ 14,213,000	$ 22,348,000	$ 23,886,000
Servicing Fees, Net	7,589,000	3,272,000	14,623,000	5,536,000
Gain (Loss) on Sale of Borrower Loans	(687,000)	3,696,000	3,104,000	5,618,000
Other Revenue	26,000		417,000	(22,000)
Total Operating Revenues	13,858,000	21,181,000	40,492,000	35,018,000
Interest Income
Interest Income on Borrower Loans	10,988,000	10,209,000	21,496,000	20,723,000
Interest Expense on Notes	(10,098,000)	(9,448,000)	(19,819,000)	(19,011,000)
Net Interest Income	890,000	761,000	1,677,000	1,712,000
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	(2,000)	94,000	(79,000)	21,000
Total Net Revenue	14,746,000	22,036,000	42,090,000	36,751,000
Expenses
Administration Fee - Related Party	15,652,000	14,085,000	36,258,000	23,380,000
Servicing	1,536,000	899,000	2,767,000	2,271,000
General and Administrative	380,000	282,000	737,000	546,000
Total Expenses	17,568,000	15,266,000	39,762,000	26,197,000
Income Tax Expense			0	0
Total Net Income	$ (2,822,000)	$ 6,770,000	$ 2,328,000	$ 10,554,000

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Other Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Loss	$ (35,628)	$ (6,201)	$ (53,092)	$ (13,477)
Other Comprehensive Income (Loss), Before Tax
Change in Net Unrealized Gain (Loss) on Available for Sale Investments, at Fair Value	25		215
Realized Gain (Loss) on Sale of Available for Sale Investments, at Fair Value	6		6
Other Comprehensive Income (Loss), Before Tax	31		221
Other Comprehensive Income (Loss), Net of Tax	31		221
Comprehensive Income (Loss)	$ (35,597)	$ (6,201)	$ (52,871)	$ (13,477)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Cash flows from Operating Activities:
Net Income (Loss)	$ (53,092)	$ (13,477)
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities:
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes	79	(21)
Depreciation And Amortization	6,430	3,455
Gain on Sales of Borrower Loans	(5,690)	(5,857)
Change in Fair Value of Servicing Rights	5,647	1,895
Stock-Based Compensation Expense	11,510	4,192
Restructuring Liability	8,492
Other, Net	227	45
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(1,358,011)	(1,402,499)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	1,353,338	1,409,426
Restricted Cash Except for those Related to Investing Activities	20,621	(63,254)
Accounts Receivable	1,564	1,956
Prepaid and Other Assets	(84)	(2,235)
Accounts Payable and Accrued Liabilities	(4,995)	2,754
Payable to Investors	(21,631)	70,551
Other Liabilities	(7,690)	(2,000)
Net Cash (Used in) Provided by Operating Activities	(43,285)	4,931
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(109,215)	(94,512)
Principal Payments of Borrower Loans Held at Fair Value	83,514	73,457
Purchases of Property and Equipment	(8,600)	(6,412)
Maturities of Short Term Investments	1,278	1,274
Purchases of Short Term Investments	(1,277)	(1,275)
Purchases of Available for Sale Investments, at Fair Value	(11,725)
Proceeds from Sale of Available for Sale Investments	9,193
Maturities of Available for Sale Investments	20,064
Acquisition of Businesses, Net of Cash Acquired		(19,000)
Changes in Restricted Cash Related to Investing Activities	(2,614)	(2,729)
Net Cash Used in Investing Activities	(19,382)	(49,197)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	109,147	94,575
Payments of Notes Held at Fair Value	(84,200)	(73,509)
Proceeds from Issuance of Convertible Preferred Stock, Net		164,793
Proceeds from Exercise of Warrants and Stock Options including Early Exercise, and Issuance of Restricted Stock	464	4,609
Repurchase of Common Stock and Restricted Stock	(46)	(21,250)
Taxes Paid for Awards Vested Under Equity Incentive Plans	(169)	(2,206)
Net Cash Provided by (Used in) Financing Activities	25,196	167,012
Net (Decrease) Increase in Cash and Cash Equivalents	(37,471)	122,746
Cash and Cash Equivalents at Beginning of the Period	66,295	50,557
Cash and Cash Equivalents at End of the Period	28,824	173,303
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	19,787	19,147
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	346	26
Non-Cash Investing Activity- Amount Payable for the Acquisition of Business		840
Prosper Funding LLC [Member]
Cash flows from Operating Activities:
Net Income (Loss)	2,328	10,554
Adjustments to Reconcile Net Income (Loss) to Net Cash Provided by (Used in) Operating Activities:
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes	79	2
Other Non-Cash Changes in Borrower Loans, Loans Held for Sale and Notes	39	(21)
Depreciation And Amortization	1,864	1,896
Gain on Sales of Borrower Loans	(5,690)	(5,648)
Change in Fair Value of Servicing Rights	5,387	1,291
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(1,358,011)	(1,402,499)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	1,353,338	1,409,426
Restricted Cash Except for those Related to Investing Activities	21,080	(62,390)
Other Assets	11	(14)
Accounts Payable and Accrued Liabilities	(755)	402
Payable to Investors	(22,051)	69,686
Net Related Party Receivable/Payable	2,077	1,387
Other Liabilities	184
Net Cash (Used in) Provided by Operating Activities	(120)	24,072
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(109,215)	(94,512)
Principal Payments of Borrower Loans Held at Fair Value	83,514	73,457
Purchases of Property and Equipment	(4,163)	(6,567)
Maturities of Short Term Investments	1,277	1,274
Purchases of Short Term Investments	(1,279)	(1,275)
Changes in Restricted Cash Related to Investing Activities	(3,076)	(2,725)
Net Cash Used in Investing Activities	(32,942)	(30,348)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	109,147	94,576
Payments of Notes Held at Fair Value	(84,200)	(73,509)
Cash Distributions to Parent		(27,000)
Net Cash Provided by (Used in) Financing Activities	24,947	(5,933)
Net (Decrease) Increase in Cash and Cash Equivalents	(8,115)	(12,209)
Cash and Cash Equivalents at Beginning of the Period	15,026	23,777
Cash and Cash Equivalents at End of the Period	6,911	11,568
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	19,787	19,147
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	$ 572
Non-Cash Financing Activity, Distribution to Parent		$ 249

Basis of Presentation

Basis of Presentation	6 Months Ended
	Jun. 30, 2016
Basis of Presentation	1. Basis of Presentation Prosper Marketplace, Inc. (“PMI”) was incorporated in the state of Delaware on March 22, 2005. Except as the context requires otherwise, as used in these notes to the condensed consolidated financial statements of Prosper Marketplace, Inc., “Prosper,” “we,” “us,” and “our” refer to PMI and its wholly-owned subsidiaries, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2015. The balance sheet at December 31, 2015 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. The preparation of Prosper’s condensed consolidated financial statements and related disclosures in conformity with GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in Prosper’s financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material. The accompanying interim condensed consolidated financial statements include the accounts of PMI and its wholly-owned subsidiaries. All intercompany balances have been eliminated in consolidation. On January 23, 2015, PMI acquired all of the outstanding limited liability company units of American HealthCare Lending, LLC (“American HealthCare Lending”), a company that operated a patient financing platform, and merged American HealthCare Lending with and into Prosper Healthcare Lending LLC (“PHL”), a newly established entity surviving the merger. Prosper’s condensed consolidated financial statements include PHL’s results of operations and financial position from the date of acquisition forward. On October 9, 2015, PMI acquired all of the outstanding stock of BillGuard, Inc. (“BillGuard”), a company incorporated in Delaware in 2010 that developed applications that help consumers manage their identity, finances and credit. PMI merged BillGuard with and into Beach Merger Sub, Inc., a newly established entity wholly owned by PMI, with BillGuard surviving the merger. Prosper’s condensed consolidated financial statements include BillGuard’s results of operations and financial position from the date of acquisition forward. Reclassifications During the period ended June 30, 2016, Prosper changed the presentation of its revenue in the condensed consolidated statements of operations. A new line called “Gain on Sales of Borrower Loans” was created with the amounts included in this line previously classified as “Other Revenue”. Prior period amounts have been reclassified to conform to the current presentation. Additionally, due to the early adoption of ASU 2016-09 on January 1, 2016, reclassifications were made to the financing section of the condensed consolidated statements of cash flows to reflect taxes paid for awards vested under equity incentive plans. Prior period amounts have been reclassified to conform to the current presentation.
Prosper Funding LLC [Member]
Basis of Presentation	1. Basis of Presentation Prosper Funding LLC (“PFL”) was formed in the state of Delaware on February 17, 2012 as a limited liability company with the sole equity member being Prosper Marketplace, Inc. (“PMI”). Except as the context otherwise requires, as used in these Notes to the condensed consolidated financial statements of Prosper Funding LLC, “Prosper Funding,” “we,” “us,” and “our” refers to PFL and its wholly owned subsidiary, Prosper Asset Holdings LLC (“PAH”), a Delaware limited liability company, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2015. The balance sheet at December 31, 2015 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. Prosper Funding did not have any items of other comprehensive income (loss) during any of the periods presented in the condensed consolidated financial statements as of and for the six months ended June 30, 2016 and 2015. The preparation of Prosper Funding's condensed consolidated financial statements and related disclosures in conformity with GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in its condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material. Reclassifications During the period ended June 30, 2016, Prosper Funding changed the presentation of its revenue in the condensed consolidated statements of operations. A new line called “Gain on Sales of Borrower Loans” was created with the amounts included in this line previously classified as “Other Revenue”. The gain on sale related to the sale of Borrower Loans was reclassified from “Other Revenues” to a new line called “Gain on Sales of Borrower Loans.”

Summary of Significant Accounti

Summary of Significant Accounting Policies	6 Months Ended
	Jun. 30, 2016
Significant Accounting Policies [Line Items]
Summary of Significant Accounting Policies	2. Summary of Significant Accounting Policies Prosper’s significant accounting policies are included in Note 2 – Summary of Significant Accounting Policies Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Available for Sale Investments at Fair Value, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature. Restructuring Charges Restructuring Borrower Loans, Loans Held for Sale and Notes Through the Note Channel, Prosper purchases Borrower Loans from WebBank then issues Notes, and holds the Borrower Loans until maturity. The obligation to repay a series of Notes issued through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans funded and Notes issued through the Note Channel are carried on Prosper’s condensed consolidated balance sheets as assets and liabilities, respectively. We choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the readers of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. Prosper estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies that take into account expected prepayments, losses, recoveries and default rates. The Borrower Loans are not derecognized when a corresponding Note is issued as Prosper maintains the ability to sell the Borrower Loans without the approval of the holders of the corresponding Notes. Recent Accounting Pronouncements In May 2014, as part of its ongoing efforts to assist in the convergence of US GAAP and International Financial Reporting Standards (“IFRS”), the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity to eliminate the use of different methods in practice and thereby reduce existing diversity in the accounting for hybrid financial instruments issued in the form of a share. For hybrid financial instruments issued in the form of a share, an entity should determine the nature of the contract by considering the economic characteristics and risks of the entire hybrid financial instrument. The existence or omission of any single term or feature does not necessarily determine the economic characteristics and risks of the host contract. This standard will be effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2015. In April 2015, the FASB issued ASU 2015-05 “ Customers’ Accounting for Fees Paid in Cloud Computing Arrangement ”, which became effective for the . The guidance changes what a customer must consider in determining whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in accordance with guidance related to internal use software; if the arrangement does not contain a software license, the customer would account for the arrangement as a service contract. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. The new guidance simplifies the accounting for measurement period adjustments in connection with business combinations by requiring that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. This guidance is effective for financial statements issued for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718).
Prosper Funding LLC [Member]
Significant Accounting Policies [Line Items]
Summary of Significant Accounting Policies	2. Significant Accounting Policies Prosper Funding's significant accounting policies are included in Note 2 – Summary of Significant Accounting Policies Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Short Term Investments, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature. Borrower Loans, Loans Held for Sale and Notes Through the Note Channel, Prosper Funding purchases Borrower Loans from WebBank then issues Notes, and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on Prosper Funding’s consolidated balance sheets as assets and liabilities, respectively. We choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the readers of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. Prosper Funding estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies that take into account expected prepayments, losses, recoveries and default rates. The Borrower Loans are not derecognized when a corresponding Note is issued as Prosper Funding maintains the ability to sell the Borrower Loans without the approval of the holders of the corresponding Notes. Recent Accounting Pronouncements In May 2014, as part of its ongoing efforts to assist in the convergence of US GAAP and International Financial Reporting Standards (“IFRS”), the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers In April 2015, the FASB issued ASU 2015-05 “ Customers’ Accounting for Fees Paid in Cloud Computing Arrangement ”, which became effective for the . The guidance changes what a customer must consider in determining whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in accordance with guidance related to internal use software; if the arrangement does not contain a software license, the customer would account for the arrangement as a service contract.

Property and Equipment, Net

Property and Equipment, Net	6 Months Ended
	Jun. 30, 2016
Property and Equipment, Net	3. Property and Equipment, Net Property and equipment consist of the following (in thousands): June 30, December 31, 2016 2015 Property and equipment: Computer equipment $ 14,153 $ 10,522 Internal-use software and website development costs 14,289 10,990 Office equipment and furniture 3,087 2,442 Leasehold improvements 7,220 5,719 Assets not yet placed in service 1,994 3,242 Property and equipment 40,743 32,915 Less accumulated depreciation and amortization (12,565 ) (7,950 ) Total property and equipment, net $ 28,178 $ 24,965 Depreciation and amortization expense for property and equipment for the three months ended June 30, 2016 and 2015 was $2.5 million and $1.4 million, respectively. Depreciation and amortization expense for property and equipment for the six months ended June 30, 2016 and 2015 was $4.5 million and $3.1 million, respectively. Prosper capitalized internal-use software and website development costs in the amount of $1.8 million and $2.1 million for the three months ended June 30, 2016 and 2015, respectively. Prosper capitalized internal-use software and website development costs in the amount of $3.6 million and $3.9 million for the six months ended June 30, 2016 and 2015, respectively. Prosper recorded internal-use software and website development impairment charges of $240 thousand and $0 for the six months ended June 30, 2016 and 2015, respectively, as a result of its decision to discontinue several software and website development projects. These charges are included in general and administration expenses on the condensed consolidated statement of operations.
Prosper Funding LLC [Member]
Property and Equipment, Net	3. Property and Equipment Property and equipment consist of the following (in thousands): June 30, December 31, 2016 2015 Property and equipment: Internal-use software and web site development costs $ 14,289 $ 10,990 Less accumulated depreciation and amortization (4,435 ) (2,571 ) Total property and equipment, net $ 9,854 $ 8,419 Depreciation expense for the three months ended June 30, 2016 and 2015 was $981 thousand and $676 thousand, respectively. Depreciation expense for the six months ended June 30, 2016 and 2015 was $1,864 thousand and $1,896 thousand, respectively.

Borrower Loans, Loans Held for

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value	6 Months Ended
	Jun. 30, 2016
Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value	4. Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale and Notes as of June 30, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Aggregate principal balance outstanding $ 312,725 $ 296,945 $ (315,671 ) $ (294,331 ) $ 4,715 $ 42 Fair value adjustments (2,691 ) 328 6,141 (3,074 ) (10 ) (10 ) Fair value $ 310,034 $ 297,273 $ (309,530 ) $ (297,405 ) $ 4,705 $ 32 At June 30, 2016, outstanding Borrower Loans had original terms to maturity of either 36 or 60 months; had monthly payments with fixed interest rates ranging from 5.32% to 33.04% and had various maturity dates through June 2021. At December 31, 2015, outstanding Borrower Loans had original maturities of either 36 or 60 months; had monthly payments with fixed interest rates ranging from 5.32% to 33.04% and had various maturity dates through December 2020. Approximately $0.3 million and $2.0 million represents the gain and loss, respectively, that is attributable to changes in the instrument specific credit risks related to Borrower Loans that were recorded in the change in fair value during the three and six months ending June 30, 2016. As of June 30, 2016, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $2.0 million and a fair value of $0.7 million. As of December 31, 2015, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $2.3 million and a fair value of $0.9 million. Prosper places loans on non-accrual status when they are over 120 days past due. As of June 30, 2016 and December 31, 2015, Borrower Loans in non-accrual status had a fair value of $0.2 million and $0.1 million, respectively.
Prosper Funding LLC [Member]
Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value	4. Borrower Loans, Loans Held For Sale and Notes Held at Fair Value The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale and Notes as of June 30, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Aggregate principal balance outstanding $ 312,725 $ 296,945 $ (315,671 ) $ (294,331 ) $ 4,715 $ 42 Fair value adjustments (2,691 ) 328 6,141 (3,074 ) (10 ) (10 ) Fair value $ 310,034 $ 297,273 $ (309,530 ) $ (297,405 ) $ 4,705 $ 32 At June 30, 2016, outstanding Borrower Loans had original terms to maturity of either 36 or 60 months; had monthly payments with fixed interest rates ranging from 5.32% to 33.04% and had various maturity dates through June 2021. At December 31, 2015, outstanding Borrower Loans had original maturities of either 36 or 60 months; had monthly payments with fixed interest rates ranging from 5.32% to 33.04% and had various maturity dates through December 2020. Approximately $314 thousand and $2,033 thousand represents the gain and loss, respectively, that is attributable to changes in the instrument specific credit risks related to Borrower Loans that were recorded in the change in fair value during the three and six months ended June 30, 2016. As of June 30, 2016, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $2.0 million and a fair value of $0.7 million. As of December 31, 2015, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $2.3 million and a fair value of $0.9 million. Prosper Funding places loans on non-accrual status when they are over 120 days past due. As of June 30, 2016 and December 31, 2015, Borrower Loans in non-accrual status had a fair value of $0.2 million and $0.1 million, respectively.

Loan Servicing Assets and Liabi

Loan Servicing Assets and Liabilities	6 Months Ended
	Jun. 30, 2016
Loan Servicing Assets and Liabilities	5. Loan Servicing Assets and Liabilities Prosper accounts for servicing assets and liabilities at their estimated fair values with changes in fair values recorded in servicing fees. The initial asset or liability is recognized when Prosper sells Borrower Loans to unrelated third-party buyers through the Whole Loan Channel and the servicing rights are retained. The servicing assets and liabilities are measured at fair value throughout the servicing period. The total gains and losses recognized on the sale of such Borrower Loans was $0.7 million of losses and $3.7 million of gains for the three months ended June 30, 2016 and 2015, respectively. The total gain recognized on the sale of such Borrower Loans was $3.1 million and $5.6 million for the six months ended June 30, 2016 and 2015, respectively. As of June 30, 2016, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $4.1 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 35.52% and various maturity dates through June 2021. At December 31, 2015, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $3.8 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 31.90% and various maturity dates through December 2020. $10.4 million and $4.6 million of contractually specified servicing fees and ancillary fees are included on our condensed consolidated statement of operations in Servicing Fees, Net for the three months ended June 30, 2016 and 2015 respectively. $20.0 million and $7.8 million of contractually specified servicing fees and ancillary fees are included on our condensed statement of operations in Servicing Fees, Net for the six months ended June 30, 2016 and 2015 respectively. Fair value Valuation method – Prosper uses a discounted cash flow valuation methodology generally consisting of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounting those cash flows at a rate of return that results in the fair value amount. Significant unobservable inputs presented in the table within Note 7 below are those that Prosper considers significant to the estimated fair values of the Level 3 servicing assets and liabilities. The following is a description of the significant unobservable inputs provided in the table. Market servicing rate Discount rate Default Rate Prepayment Rate
Prosper Funding LLC [Member]
Loan Servicing Assets and Liabilities	5. Loan Servicing Assets and Liabilities Prosper Funding accounts for servicing assets and liabilities at their estimated fair values with changes in fair values recorded in servicing fees. The initial asset or liability is recognized when Prosper Funding sells Borrower Loans to unrelated third-party buyers through the Whole Loan Channel and the servicing rights are retained. The servicing assets and liabilities are measured at fair value throughout the servicing period. The total gains and losses recognized on the sale of such Borrower Loans was $0.7 million of losses and $3.7 million of gains for the three months ended June 30, 2016 and 2015, respectively. The total gain recognized on the sale of such Borrower Loans was $3.1 million and $5.6 million for the six months ended June 30, 2016 and 2015, respectively. At June 30, 2016, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights, had a total outstanding principal balance of $3.9 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 35.52% and various maturity dates through June 2021. At December 31, 2015, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights, had a total outstanding principal balance of $3.6 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 31.90% and various maturity dates through December 2020. $10.3 million and $4.1 million of contractually specified servicing fees and ancillary fees are included on our condensed consolidated statement of operations in Servicing Fees, Net for the three months ended June 30, 2016 and 2015 respectively. $19.7 million and $6.8 million of contractually specified servicing fees and ancillary fees are included on our condensed consolidated statement of operations in Servicing Fees, Net for the six months ended June 30, 2016 and 2015 respectively. Fair value Valuation method – Prosper Funding uses a discounted cash flow valuation methodology generally consisting of developing an estimate of future cash flows that are expected to occur over the life of a financial instrument and then discounting those cash flows at a rate of return that results in the fair value amount. Significant unobservable inputs presented in the table within Note 7 below are those that Prosper Funding considers significant to the estimated fair values of the Level 3 servicing assets and liabilities. The following is a description of the significant unobservable inputs provided in the table. Market servicing rate Discount rate Default Rate Prepayment Rate

Available for Sale Investments,

Available for Sale Investments, at Fair Value	6 Months Ended
	Jun. 30, 2016
Investments Debt And Equity Securities [Abstract]
Available for Sale Investments, at Fair Value	6. Available for Sale Investments, at Fair Value Available for sale investments are recorded at fair value and unrealized gains and losses are reported, net of taxes, in accumulated other comprehensive income (loss) included in stockholders' equity unless management determines that an investment is other-than-temporarily impaired (OTTI). The amortized cost, gross unrealized gains and losses, and fair value of available for sale investments as of June 30, 2016 and December 31, 2015, are as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 37,453 $ 49 $ (9 ) $ 37,493 Commercial paper 3,899 - - 3,899 US Treasury securities 10,533 28 - 10,561 Agency bonds 2,499 11 - 2,510 Total fixed maturity securities 54,384 88 (9 ) 54,463 Short term bond funds 1,250 - - 1,250 Total Available for Sale Investments $ 55,634 $ 88 $ (9 ) $ 55,713 December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 50,327 $ 1 $ (94 ) $ 50,234 Commercial paper 9,493 - - 9,493 US Treasury securities 8,512 - (41 ) 8,471 Agency bonds 2,499 - (8 ) 2,491 Total fixed maturity securities 70,831 1 (143 ) 70,689 Short term bond funds 2,500 - (2 ) 2,498 Total Available for Sale Investments $ 73,331 $ 1 $ (145 ) $ 73,187 A summary of available for sale investments with unrealized losses as of June 30, 2016, and December 31, 2015, aggregated by category and period of continuous unrealized loss, is as follows: Less than 12 months 12 months or longer Total June 30, 2016 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 9,753 $ (9 ) $ - $ - $ 9,753 $ (9 ) U.S. treasury securities - - - - - - Agency bonds - - - - - - Total fixed maturity securities 9,753 (9 ) - - 9,753 (9 ) Short term bond funds - - - - - - Total Investments with Unrealized Losses $ 9,753 $ (9 ) $ - $ - $ 9,753 $ (9 ) Less than 12 months 12 months or longer Total December 31, 2015 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 45,375 $ (94 ) $ - $ - $ 45,375 $ (94 ) U.S. treasury securities 8,471 (41 ) - - 8,471 (41 ) Agency bonds 2,491 (8 ) - - 2,491 (8 ) Total fixed maturity securities 56,337 (143 ) - - 56,337 (143 ) Short term bond funds 2,498 (2 ) - - 2,498 (2 ) Total Investments with Unrealized Losses $ 58,835 $ (145 ) $ - $ - $ 58,835 $ (145 ) There were no impairment charges recognized during the six months ended June 30, 2016. The maturities of available for sale investments at June 30, 2016, and December 31, 2015, are as follows: June 30, 2016 Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 28,677 $ 8,816 $ - $ - $ 37,493 Commercial paper 3,899 - - - 3,899 US Treasury securities 3,006 7,555 - - 10,561 Agency bonds - 2,510 - - 2,510 Total Fair Value $ 35,582 $ 18,881 $ - $ - $ 54,463 Total Amortized Cost $ 35,560 $ 18,824 $ - $ - $ 54,384 December 31, 2015 Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 26,289 $ 23,945 $ - $ - $ 50,234 Commercial paper 9,493 - - - 9,493 US Treasury securities - 8,471 - - 8,471 Agency bonds - 2,491 - - 2,491 Total Fair Value $ 35,782 $ 34,907 $ - $ - $ 70,689 Total Amortized Cost $ 35,831 $ 35,000 $ - $ - $ 70,831 During the three and six months ended June 30, 2016, Prosper sold $9.2 million of investments which resulted in a realized gain of $6 thousand.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	6 Months Ended
	Jun. 30, 2016
Fair Value of Assets and Liabilities	7. Fair Value of Assets and Liabilities Prosper measures the fair value of assets and liabilities in accordance with its 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. We apply this framework whenever other standards require (or permit) assets or liabilities to be measured at fair value. 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 methodologies 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 methodologies, which incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument or valuations that require significant management judgment or estimation. Fair values of assets or liabilities are determined based on the fair value hierarchy, 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 methodologies 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, Available for Sale Investments, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. Servicing Assets and Liabilities are also subject to fair value measurement within the financial statements of Prosper. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature. Financial Instruments Recorded at Fair Value The fair value of the Borrower Loans, Loans Held for Sale and Notes are estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary cash flow assumptions used to value such Borrower Loans, Loans Held for Sale and Notes include default rates derived from historical performance and discount rates applied to each credit grade based on the perceived credit risk of each credit grade. Investments held at fair value consist of available for sale investments. The available for sale investments consist of corporate debt securities, commercial paper, U.S. treasury securities, agency bonds and short term bond funds. When available, Prosper uses quoted prices in active markets to measure the fair value of securities available for sale. When utilizing market data and bid-ask spreads, Prosper uses the price within the bid-ask spread that best represents fair value. When quoted prices do not exist, Prosper uses prices obtained from independent third-party pricing services to measure the fair value of investment assets. Prosper generally obtains prices from at least two independent pricing sources for assets recorded at fair value. Prosper's primary independent pricing service provides prices based on observable trades and discounted cash flows that incorporate observable information, such as yields for similar types of securities (a benchmark interest rate plus observable spreads) and weighted-average maturity for the same or similar securities. Prosper compares the prices obtained from its primary independent pricing service to the prices obtained from the additional independent pricing services to determine if the price obtained from the primary independent pricing service is reasonable. Prosper does not adjust the prices received from independent third-party pricing services unless such prices are inconsistent with the definition of fair value and result in a material difference in the recorded amounts. The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): June 30, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 310,034 $ 310,034 Loans Held for Sale - - 4,705 4,705 Available for Sale Investments, at Fair Value - 55,713 - 55,713 Servicing Assets - - 14,297 14,297 Total Assets - 55,713 329,036 384,749 Liabilities: Notes $ - $ - $ 309,530 $ 309,530 Servicing Liabilities - - 324 324 Contingent Consideration - - 4,929 4,929 Total Liabilities $ - $ - $ 314,783 $ 314,783 December 31, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 297,273 $ 297,273 Loans Held for Sale - - 32 32 Available for Sale Investments, at Fair Value - 73,187 - 73,187 Servicing Assets - - 14,363 14,363 Total Assets - 73,187 311,668 384,855 Liabilities: Notes $ - $ - $ 297,405 $ 297,405 Servicing Liabilities - - 484 484 Contingent Consideration - - 4,801 4,801 Total Liabilities $ - $ - $ 302,690 $ 302,690 As Prosper’s Borrower Loans, Loans Held for Sale, Notes and loan servicing rights do not trade in an active market with readily observable prices, Prosper uses significant unobservable inputs to measure the fair value of these assets and liabilities. Financial instruments are categorized in the level 3 valuation hierarchy based on the significance of unobservable factors in the overall fair value measurement. These fair value estimates may also include observable, actively quoted components derived from external sources. As a result, the realized and unrealized gains and losses for assets and liabilities within the level 3 category may include changes in fair value that were attributable to both observable and unobservable inputs. Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs used for Prosper’s level 3 fair value measurements at June 30, 2016 and December 31, 2015: Borrower Loans, Loans Held for Sale and Notes: Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 4.4% - 15.0% 4.3% - 14.5% Default rate 1.6% - 14.8% 1.4% - 14.4% Servicing Rights Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.0% 1.2% - 14.7% Prepayment rate 14.8% - 27.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 % At June 30, 2016, the discounted cash flow methodology used to estimate the Note fair values used the same projected cash flows as the related Borrower Loans. As demonstrated in the following table, the fair value adjustments for Borrower Loans were largely offset by the fair value adjustments of the Notes due to the borrower payment dependent design of the Notes and because the principal balances of the Borrower Loans approximated the principal balances of the Notes. The following tables present additional information about level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at January 1, 2016 $ 297,273 $ (297,405 ) $ 32 $ (100 ) Purchase of Borrower Loans/Issuance of Notes 109,215 (109,147 ) 1,358,011 1,358,079 Principal repayments (82,376 ) 83,119 (136 ) 607 Borrower Loans sold to third parties (1,138 ) 1,081 (1,353,202 ) (1,353,259 ) Other changes (6 ) (33 ) - (39 ) Change in fair value (12,934 ) 12,855 - (79 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at January 1, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Purchase of Borrower Loans/Issuance of Notes 94,512 (94,575 ) 1,402,499 1,402,436 Principal repayments (73,457 ) 73,509 (543 ) (491 ) Borrower Loans sold to third parties - - (1,408,883 ) (1,408,883 ) Other changes (130 ) 136 (9 ) (3 ) Change in fair value (9,968 ) 10,085 (96 ) 21 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 Purchase of Borrower Loans/Issuance of Notes 46,805 (46,779 ) 861,574 861,600 Principal repayments (37,395 ) 37,440 (157 ) (112 ) Borrower Loans sold to third parties - - (861,574 ) (861,574 ) Other changes (136 ) (71 ) (1 ) (208 ) Change in fair value (5,478 ) 5,583 (10 ) 95 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 Purchase of Borrower Loans/Issuance of Notes 54,044 (53,873 ) 426,591 426,762 Principal repayments (41,390 ) 41,057 (131 ) (464 ) Borrower Loans sold to third parties (525 ) 499 (421,784 ) (421,810 ) Other changes (2 ) (191 ) - (193 ) Change in fair value (5,336 ) 5,335 (1 ) (2 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 The following tables present additional information about level 3 servicing assets and liabilities measured at fair value on a recurring basis (in thousands): Servicing Assets Servicing Liabilities Fair Value at January 1, 2016 14,363 484 Additions 5,750 9 Less: Changes in fair value (5,816 ) (169 ) Fair Value at June 30, 2016 14,297 324 Servicing Assets Servicing Liabilities Amortized Cost at January 1, 2015 4,163 624 Adjustment to Adopt Fair Value Measurement 546 (29 ) Fair Value at January 1, 2015 4,709 595 Additions 5,837 193 Less: Changes in fair value (1,864 ) (182 ) Fair Value at June 30, 2015 8,682 606 Servicing Assets Servicing Liabilities Fair Value at April 1, 2016 15,548 398 Additions 1,729 - Less: Changes in fair value (2,980 ) (74 ) Fair Value at June 30, 2016 14,297 324 Servicing Assets Servicing Liabilities Fair Value at April 1, 2015 6,034 668 Additions 3,759 39 Less: Changes in fair value (1,111 ) (101 ) Fair Value at June 30, 2015 8,682 606 Contingent Consideration: On October 9, 2015, PMI, purchased 100% of the outstanding shares of BillGuard. The contingent consideration was primarily performance-based and will be determined over a one-year period from the date of purchase. Total contingent consideration due in October 2016 is based on revenues generated and other criteria. We measured the fair value of the contingent consideration using a probability-weighted discounted cash flow approach. Some of the significant inputs used for the valuation are not observable in the market and are thus Level 3 inputs. Contingent consideration is recorded in the condensed consolidated balance sheet under "Other Liabilities." Significant increases or decreases in certain underlying assumptions used to value the contingent consideration could significantly increase or decrease the fair value estimates recorded in the condensed consolidated balance sheets. During the three and six month periods ended June 30, 2016, there were fair value changes of $63 thousand and $128 thousand, respectively, resulting in a fair value of $4.9 million at June 30, 2016 from the opening fair value at January 1, 2016 of $4.8 million. Significant Recurring Level 3 Fair Value Asset and Liability Input Sensitivity Key economic assumptions and the sensitivity of the current fair value to immediate changes in those assumptions at June 30, 2016 for Borrower Loans, Loans Held for Sale and Notes funded through the Note Channel are presented in the following table (in thousands, except percentages): Borrower Loans and Loans Held for Sale Notes Discount rate assumption: 7.25 %* 7.25 %* Resulting fair value from: 100 basis point increase $ 306,868 $ 306,363 200 basis point increase 303,781 303,277 Resulting fair value from: 100 basis point decrease $ 313,283 $ 312,780 200 basis point decrease 316,619 316,116 Default rate assumption: 11.02 %* 11.02 %* Resulting fair value from: 100 basis point increase $ 306,882 $ 306,370 200 basis point increase 303,823 303,303 Resulting fair value from: 100 basis point decrease $ 313,200 $ 312,704 200 basis point decrease 316,399 315,913 * Represents weighted average assumptions considering all credit grades. The following table presents the estimated impact on Prosper’s estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of June 30, 2016 (in thousands, except percentages). Servicing Assets Servicing Liabilities Market servicing rate assumptions 0.625 % 0.625 % Resulting fair value from: Market servicing rate increase to 0.65% 13,252 $ 356 Market servicing rate decrease to 0.60% 15,342 $ 291 Weighted average prepayment assumptions 20.44 % 20.44 % Resulting fair value from: Applying a 1.1 multiplier to prepayment rate 13,918 $ 303 Applying a 0.9 multiplier to prepayment rate 14,451 $ 314 Weighted average default assumptions 11.39 % 11.39 % Resulting fair value from: Applying a 1.1 multiplier to default rate $ 14,067 $ 323 Applying a 0.9 multiplier to default rate $ 14,530 $ 323 These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a variation in assumptions generally cannot be determined because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may lead to changes in other factors, which could impact the above hypothetical effects.
Prosper Funding LLC [Member]
Fair Value of Assets and Liabilities	7. Fair Value of Assets and Liabilities Prosper Funding 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 methodologies 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 methodologies, which incorporate management’s own estimates of assumptions that market participants would use in pricing the instrument or valuations that require significant management judgment or estimation. Fair values of assets or liabilities are determined based on the fair value hierarchy, 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 methodologies 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, accounts payable and accrued liabilities, and Notes. Servicing assets and liabilities are also subject to fair value measurement within the financial statements of Prosper Funding. 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. Financial Instruments Recorded at Fair Value The fair value of the Borrower Loans, Loans Held for Sale and Notes are estimated using discounted cash flow methodologies based upon a set of valuation assumptions. The primary cash flow assumptions used to value such Borrower Loans, Loans Held for Sale and Notes include default rates derived from historical performance and discount rates applied to each credit grade based on the perceived credit risk of each credit grade. Investments held at fair value consist of available for sale investments. The available for sale investments consist of corporate and government bonds. When available, Prosper Funding uses quoted prices in active markets to measure the fair value of securities available for sale. When utilizing market data and bid-ask spreads, Prosper Funding uses the price within the bid-ask spread that best represents fair value. When quoted prices do not exist, Prosper Funding uses prices obtained from independent third-party pricing services to measure the fair value of investment assets. Prosper Funding generally obtains prices from at least two independent pricing sources for assets recorded at fair value. Prosper Funding's primary independent pricing service provides prices based on observable trades and discounted cash flows that incorporate observable information, such as yields for similar types of securities (a benchmark interest rate plus observable spreads) and weighted-average maturity for the same or similar securities. Prosper Funding compares the prices obtained from its primary independent pricing service to the prices obtained from the additional independent pricing services to determine if the price obtained from the primary independent pricing service is reasonable. Prosper Funding does not adjust the prices received from independent third-party pricing services unless such prices are inconsistent with the definition of fair value and result in a material difference in the recorded amounts. The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): June 30, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 310,034 $ 310,034 Loans Held for Sale - - 4,705 4,705 Servicing Assets - - 13,798 13,798 Total Assets - - 328,537 328,537 Liabilities: Notes $ - $ - $ 309,530 $ 309,530 Servicing Liabilities - - 324 324 Total Liabilities $ - $ - $ 309,854 $ 309,854 December 31, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 297,273 $ 297,273 Loans Held for Sale - - 32 32 Servicing Assets - - 13,605 13,605 Total Assets - - 310,910 310,910 Liabilities: Notes $ - $ - $ 297,405 $ 297,405 Servicing Liabilities - - 484 484 Total Liabilities $ - $ - $ 297,889 $ 297,889 As Prosper Funding’s Borrower Loans, Loans Held for Sale, Notes and loan servicing rights do not trade in an active market with readily observable prices, Prosper Funding uses significant unobservable inputs to measure the fair value of these assets and liabilities. Financial instruments are categorized in the level 3 valuation hierarchy based on the significance of unobservable factors in the overall fair value measurement. These fair value estimates may also include observable, actively quoted components derived from external sources. As a result, the realized and unrealized gains and losses for assets and liabilities within the level 3 category may include changes in fair value that were attributable to both observable and unobservable inputs. Significant Unobservable Inputs The following tables present quantitative information about the significant unobservable inputs used for Prosper Funding’s level 3 fair value measurements at June 30, 2016 and December 31, 2015 : Borrower Loans, Loans Held for Sale and Notes: Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 4.4% - 15.0% 4.3% - 14.5% Default rate 1.6% - 14.8% 1.4% - 14.4% Servicing Rights Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.0% 1.2% - 14.7% Prepayment rate 14.8% - 27.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 % The changes in the Borrower Loans, Loans Held for Sale and Notes, which are Level 3 assets and liabilities measured at fair value on a recurring basis are as follows (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at January 1, 2016 $ 297,273 $ (297,405 ) $ 32 $ (100 ) Originations 109,215 (109,147 ) 1,358,011 1,358,079 Principal repayments (82,376 ) 83,119 (136 ) 607 Borrower Loans sold to third parties (1,138 ) 1,081 (1,353,202 ) (1,353,259 ) Other changes (6 ) (33 ) - (39 ) Change in fair value (12,934 ) 12,855 - (79 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at January 1, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Originations 94,512 (94,575 ) 1,402,499 1,402,436 Principal repayments (73,457 ) 73,509 (543 ) (491 ) Borrower Loans sold to third parties - - (1,408,883 ) (1,408,883 ) Other changes (130 ) 136 (9 ) (3 ) Change in fair value (9,968 ) 10,085 (96 ) 21 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at April 1, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 Originations 46,805 (46,779 ) 861,574 861,600 Principal repayments (37,395 ) 37,440 (157 ) (112 ) Borrower Loans sold to third parties - - (861,574 ) (861,574 ) Other changes (136 ) (71 ) (1 ) (208 ) Change in fair value (5,478 ) 5,583 (10 ) 95 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 Purchase of Borrower Loans/Issuance of Notes 54,044 (53,873 ) 426,591 426,762 Principal repayments (41,390 ) 41,057 (131 ) (464 ) Borrower Loans sold to third parties (525 ) 499 (421,784 ) (421,810 ) Other changes (2 ) (191 ) - (193 ) Change in fair value (5,336 ) 5,335 (1 ) (2 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 The following table presents additional information about Level 3 servicing assets and liabilities recorded at fair value for the three months ended June 30, 2016 (in thousands). Servicing Servicing Assets Liabilities Fair Value at January 1, 2016 13,605 484 Additions 5,750 9 Less: Changes in fair value (5,557 ) (169 ) Fair Value at June 30, 2016 13,798 324 Servicing Assets Servicing Liabilities Amortized Cost at January 1, 2015 3,116 624 Adjustment to Adopt Fair Value Measurement 399 (29 ) Fair Value at January 1, 2015 3,515 595 Additions 5,837 193 Less: Transfers to PMI (249 ) - Less: Changes in fair value (1,469 ) (182 ) Fair Value at June 30, 2015 7,634 606 Servicing Servicing Assets Liabilities Fair Value at April 1, 2016 14,929 398 Additions 1,729 - Less: Changes in fair value (2,860 ) (74 ) Fair Value at June 30, 2016 13,798 324 Servicing Assets Servicing Liabilities Fair Value at April 1, 2015 4,782 668 Additions 3,759 39 Less: Transfers to PMI - - Less: Changes in fair value (907 ) (101 ) Fair Value at June 30, 2015 7,634 606 Significant Recurring Level 3 Fair Value Asset and Liability Input Sensitivity Key economic assumptions and the sensitivity of the current fair value to immediate changes in those assumptions at June 30, 2016 for Borrower Loans, Loans Held for Sale and Notes funded are presented in the following table (in thousands): Borrower Loans and Loans Held for Sale Notes Discount rate assumption: 7.25 %* 7.25 %* Resulting fair value from: 100 basis point increase $ 306,868 $ 306,363 200 basis point increase 303,781 303,277 Resulting fair value from: 100 basis point decrease $ 313,283 $ 312,780 200 basis point decrease 316,619 316,116 Default rate assumption: 11.02 %* 11.02 %* Resulting fair value from: 100 basis point increase $ 306,882 $ 306,370 200 basis point increase 303,823 303,303 Resulting fair value from: 100 basis point decrease $ 313,200 $ 312,704 200 basis point decrease 316,399 315,913 * Represents weighted average assumptions considering all credit grades. Servicing Asset and Liability Fair Value Input Sensitivity: The following table presents the estimated impact on Prosper Funding’s estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of June 30, 2016 (in thousands, except percentages). Servicing Assets Servicing Liabilities Market servicing rate assumptions 0.625 % 0.625 % Resulting fair value from: Market servicing rate increase to 0.65% 12,952 356 Market servicing rate decrease to 0.60% 14,995 291 Weighted average prepayment assumptions 20.44 % 20.44 % Resulting fair value from: Applying a 1.1 multiplier to default rate 13,541 303 Applying a 0.9 multiplier to default rate 14,059 314 Weighted average default assumptions 11.39 % 11.39 % Resulting fair value from: Applying a 1.1 multiplier to default rate 13,576 323 Applying a 0.9 multiplier to default rate 14,023 323 These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a 10% variation in assumptions generally cannot be determined because the relationship of the change in assumptions to the fair value may not be linear. Additionally, the impact of a variation in a particular assumption on the fair value is calculated while holding other assumptions constant. In reality, changes in one factor may lead to changes in other factors, which could impact the above hypothetical effects.

Acquisitions

Acquisitions	6 Months Ended
	Jun. 30, 2016
Business Combinations [Abstract]
Acquisitions	8. Acquisitions On January 23, 201 . On October 9, 2015, PMI acquired all of the outstanding shares of BillGuard. PMI merged BillGuard with and into Beach Merger Sub, Inc., a newly established entity wholly owned by PMI, with BillGuard surviving the merger. The allocation of the purchase price is preliminary and subject to further adjustment as information relative to closing date balances and related tax balances are finalized.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	9. Goodwill and Other Intangible Assets Goodwill Prosper’s goodwill balance of $36.4 million at June 30, 2016 did not change during the six months ended June 30, 2016. We did not record any goodwill impairment expense for the six months ended June 30, 2016. Other Intangible Assets The following table presents the detail of other intangible assets for the period presented (dollars in thousands): June 30, 2016 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) User base and customer relationships $ 6,250 $ (1,976 ) $ 4,274 8.6 Developed technology 8,310 (1,508 ) $ 6,802 4.3 Brand name 60 (60 ) - - Total intangible assets subject to amortization $ 14,620 $ (3,544 ) $ 11,076 Prosper’s intangible asset balance was $11.1 million and $13.1 million at June 30, 2016 and December 31, 2015, respectively. The user base and customer relationship intangible assets are being amortized on an accelerated basis over a three to ten year period. The technology and brand name intangible assets are being amortized on a straight line basis over three to five years and one year, respectively. Amortization expense for the three months ended June 30, 2016 and 2015 was $1.0 million and $0.3 million, respectively. Amortization expense for the six months ended June 30, 2016 and 2015 was $2.0 million and $0.3 million, respectively. Estimated amortization of purchased intangible assets for future periods is as follows (in thousands): Year Ending December 31, 2016 $ 1,862 2017 3,260 2018 2,329 2019 1,779 2020 1,344 Thereafter 502 Total $ 11,076

Other Liabilities

Other Liabilities	6 Months Ended
	Jun. 30, 2016
Other Liabilities [Abstract]
Other Liabilities	10. Other Liabilities Other Liabilities includes the following: June 30, 2016 December 31, 2015 Class action settlement liability $ 2,973 $ 5,949 Repurchase liability for unvested restricted stock awards 267 473 Contingent consideration 4,929 4,801 Deferred revenue 420 1,591 Servicing liabilities 324 484 Deferred rent 4,647 5,240 Restructuring liability 8,492 - Other 2,364 2,197 Total Other Liabilities $ 24,416 $ 20,735

Net Loss Per Share

Net Loss Per Share	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Net Loss Per Share	11. Net Loss Per Share The weighted average shares used in calculating basic and diluted net loss per share excludes certain shares that are disclosed as outstanding shares in the condensed consolidated balance sheets because such shares are restricted as they were associated with options that were early exercised and continue to remain unvested. Basic and diluted net loss per share was calculated as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net loss available to common stockholders for basic and diluted EPS $ (35,628 ) $ (6,201 ) $ (53,092 ) $ (13,477 ) Denominator: Weighted average shares used in computing basic and diluted net loss per share 63,270,058 55,612,485 61,813,773 54,168,175 Basic and diluted net loss per share $ (0.56 ) $ (0.11 ) $ (0.86 ) $ (0.25 ) The following common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (shares) (shares) (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding 177,388,425 35,477,685 177,388,425 35,477,685 Stock options issued and outstanding 43,719,604 6,982,320 41,694,271 6,478,422 Unvested stock options exercised 5,345,950 3,084,604 5,345,950 3,084,604 Warrants issued and outstanding 962,113 123,467 792,449 123,467 Total common stock equivalents excluded from diluted net loss per common share computation 227,416,092 45,668,076 225,221,095 45,164,178 The number of shares issued and outstanding reflect a 5-for-1 forward stock split effected by PMI on February 16, 2016.

Convertible Preferred Stock and

Convertible Preferred Stock and Stockholders' Deficit	6 Months Ended
	Jun. 30, 2016
Stockholders Equity Note [Abstract]
Convertible Preferred Stock and Stockholders' Deficit	12. Convertible Preferred Stock and Stockholders’ Deficit Convertible Preferred Stock The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of June 30, 2016 are disclosed in the table below (amounts in thousands except share and per share amounts): Convertible Preferred Stock Par Value Authorized shares Outstanding and Issued shares Liquidation Preference New Series A $ 0.01 68,558,220 68,558,220 $ 19,774 Series A-1 0.01 24,760,915 24,760,915 49,522 New Series B 0.01 35,775,880 35,775,880 21,581 New Series C 0.01 24,404,770 24,404,770 70,075 New Series D 0.01 23,888,640 23,888,640 165,000 177,388,425 177,388,425 $ 325,952 The number of shares issued and outstanding reflect a 5-for-1 forward stock split effected by PMI on February 16, 2016. Common Stock PMI, through its amended and restated certificate of incorporation, as amended, is the sole issuer of common stock and related options, RSUs and warrants. On February 16, 2016, PMI amended and restated its certificate of incorporation to, among other things, effect a 5-for-1 forward stock split. On May 31, 2016, PMI further amended its amended and restated certificate of incorporation to increase the number of shares of common stock authorized for issuance. The total number of shares of stock which PMI has the authority to issue is 475,610,528, consisting of 298,222,103 shares of common stock, $0.01 par value per share, and 177,388,425 shares of preferred stock, $0.01 par value per share. As of June 30, 2016, 70,893,225 shares of common stock were issued and 69,957,290 shares of common stock were outstanding. As of December 31, 2015, 70,367,425 shares of common stock were issued and 69,431,490 shares of common stock were outstanding. Each holder of common stock is entitled to one vote for each share of common stock held. Common Stock Issued upon Exercise of Stock Options During the six months ended June 30, 2016, PMI issued 334,475 shares of common stock upon the exercise of vested options for cash proceeds of $0.3 million. Certain options are eligible for exercise prior to vesting. These unvested options may be exercised for restricted shares of common stock that have the same vesting schedule as the options. Prosper records a liability for the exercise price paid upon the exercise of unvested options, which is reclassified to common stock and additional paid-in capital as the shares vest. Should the holder’s employment be terminated, the unvested restricted shares are subject to repurchase by PMI at an amount equal to the exercise price paid for such shares. At June 30, 2016 and December 31, 2015, there were 5,345,950 and 9,806,170 shares, respectively, of restricted stock outstanding that remain unvested and subject to Prosper’s right of repurchase. For the six months ended June 30, 2016, PMI repurchased 51,105 shares of restricted stock for $46 thousand upon termination of employment of various employees. Common Stock Issued upon Exercise of Warrants For the six months ended June 30, 2016, PMI issued 51,915 shares of common stock upon the exercise of warrants for aggregate proceeds of $11 thousand.

Shared Based Incentive Plan and

Shared Based Incentive Plan and Compensation	6 Months Ended
	Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Shared Based Incentive Plan and Compensation	13. Share Based Incentive Plan and Compensation In 2005, PMI’s stockholders approved the adoption of the 2005 Stock Plan. On December 1, 2010, PMI’s stockholders approved the adoption of the Amended and Restated 2005 Stock Plan (the “2005 Plan”). The 2005 Plan expired during the year ending December 31, 2015 and PMI’s stockholders approved the adoption of the 2015 Equity Incentive Plan. On February 15, 2016, PMI’s stockholders approved the adoption of an Amendment No. 1 to the 2015 Equity Incentive Plan, and on May 31, 2016, PMI’s stockholders approved the adoption of an Amendment No. 2 to the 2015 Equity Incentive Plan (as amended to date, the “2015 Plan”). As of June 30, 2016 under the 2005 Plan, up to 59,388,480 shares of common stock are reserved and may be issued to employees, directors, and consultants by PMI’s board of directors and stockholders to promote the success of Prosper’s business. As of June 30, 2016 under the 2015 Plan, up to 51,850,918 shares of common stock are reserved and may be granted to employees, directors, and consultants by PMI’s board of directors and stockholders to promote the success of Prosper’s business. Options generally vest 25% one year from the vesting commencement date and 1/48 th th t h At June 30, 2016, there were 11,402,606 shares available for grant under the 2015 Plan and zero shares available for grant under the 2005 Plan. The number of options, restricted stock units and amounts per share reflects a 5-for-1 forward stock split effected by PMI on February 16, 2016. Stock Option Reprice On May 3, 2016, the Compensation Committee of the Board of Directors of PMI approved a stock option repricing program, (the “Reprice”) authorizing PMI’s officers to reprice certain outstanding stock options held by employees and directors that have exercise prices above the current fair market value of PMI’s common stock. The repricing was effected on May 16, 2016 for eligible directors and employees located in the United States and on May 19, 2016 for eligible employees located in Israel. Prosper believes the repricing of such stock options will encourage the continued service of valued employees and directors, and motivate such service providers to perform at high levels, both of which are critical to Prosper’s continued success. Prosper expects to incur additional stock based compensation charges as a result of this repricing. The financial statement impact of this repricing is $1.2 million in the 3 months ended June 30, 2016 and $4.2 million (net of forfeitures) that will be recognized over the remaining weighted average vesting period of 2.8 years. Early Exercised Stock Options The activity of options that were early exercised under the 2005 Plan for the six months ended June 30, 2016 is below: Early exercised options, unvested Weighted average exercise price Balance as of January 1, 2016 9,806,170 $ 0.05 Repurchase of restricted stock (51,105 ) 0.90 Restricted stock vested (4,409,115 ) 0.04 Balance as of June 30, 2016 5,345,950 $ 0.05 Additional information regarding the unvested early exercised stock options outstanding as of June 30, 2016 is as follows: Options Outstanding Range of Exercise Number Weighted –Avg. Weighted –Avg. Prices Outstanding Remaining Life Exercise Price 0.02 4,847,590 0.7 $ 0.02 0.11 387,010 1.6 0.11 1.13 111,350 2.1 1.13 $0.02 - $1.13 5,345,950 0.8 $ 0.05 Stock Option Activity Stock option activity under the 2005 Plan and 2015 Plan is summarized for the six months ended June 30, 2016 below: Options Issued and Outstanding Weighted- Average Exercise Price Balance as of January 1, 2016 40,425,605 $ 2.64 Options issued 19,655,338 $ 2.14 Options exercised – vested (334,475 ) 0.85 Options forfeited (4,725,406 ) 1.38 Balance as of June 30, 2016 55,021,062 1.54 Options vested and/or exercisable at June 30, 2016 26,856,397 1.15 Due to the timing of the Reprice, the ending weighted average exercise price shown above reflects repriced options while the opening weighted average exercise price does not. Other Information Regarding Stock Options Additional information regarding common stock options outstanding as of June 30, 2016 is as follows: Options Outstanding Options Vested and Exercisable Weighted – Weighted – Weighted - Range of Avg. Avg. Avg. Exercise Number Remaining Exercise Number Exercise Prices Outstanding Life Price Vested Price $ 0.02 - 0.99 13,462,825 7.41 $ 0.12 13,462,110 $ 0.12 1.00 - 2.99 38,325,717 9.34 2.04 11,565,657 1.91 3.00 - 4.99 1,586,875 8.63 3.62 1,586,875 3.62 5.00 - 5.52 1,645,645 9.14 5.49 241,755 5.46 $ 0.02 - 5.52 55,021,062 8.84 $ 1.72 26,856,397 $ 1.15 The fair value of options granted to employees is estimated on the grant date using the Black-Scholes option valuation model. This valuation model for stock-based compensation expense requires Prosper to make assumptions and judgments about the variables used in the calculation, including the fair value of PMI’s common stock, the expected term (the period of time that the options granted are expected to be outstanding), the volatility of PMI’s common stock, a risk-free interest rate, and expected dividends. Given the absence of a publicly traded market, Prosper considered numerous objective and subjective factors to determine the fair value of PMI’s common stock at each grant date. These factors included, but were not limited to: (i) contemporaneous valuations of common stock performed by unrelated third-party specialists; (ii) the prices for PMI’s preferred stock sold to outside investors; (iii) the rights, preferences and privileges of PMI’s preferred stock relative to PMI’s common stock; (iv) the lack of marketability of PMI’s common stock; (v) developments in the business; (vi) secondary transactions of PMI’s common and preferred shares and (vii) the likelihood of achieving a liquidity event, such as an initial public offering or a merger or acquisition of Prosper, given prevailing market conditions. Prosper also estimates forfeitures of unvested stock options. Expected forfeitures are based on Prosper’s historical experience. To the extent actual forfeitures differ from the estimates, the difference will be recorded as a cumulative adjustment in the period estimates are revised. No compensation cost is recorded for options that do not vest. The fair value of PMI’s stock option awards granted during the three months ended June 30, 2016 and 2015 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Volatility of common stock 50.88 % 52.75 % 50.88 % 57.26 % Risk-free interest rate 1.29 % 1.80 % 1.29 % 1.72 % Expected life 5.8 years 6.0 years 5.8 years 6.1 years Dividend yield 0 % 0 % 0 % 0 % Restricted Stock Unit Activity During the six months ended June 30, 2016, PMI granted restricted stock units (“RSUs”) to certain employees that are subject to three-year vesting terms or four year vesting terms and the occurrence of a liquidity event. The aggregate fair value of the RSUs granted was $10.7 million. The following table summarizes the activities for PMI’s RSUs during the six months ending June 30, 2016: Number of Shares Weighted-Average Grant Date Fair Value Unvested - December 31, 2015 1,835,510 $ 5.52 Granted 3,580,220 2.14 Vested - - Forfeited (1,274,920 ) 2.14 Unvested - June 30, 2016 4,140,810 $ 2.59 The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in Prosper’s condensed consolidated statements of operations during the three months ended June 30, 2016 and 2015 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Origination and servicing $ 579 $ 292 $ 1,018 $ 436 Sales and marketing 896 676 1,632 1,065 General and administrative 4,884 1,784 8,815 2,691 Restructuring 45 - 45 - Total stock based compensation $ 6,404 $ 2,752 $ 11,510 $ 4,192 During the three months ended June 30, 2016 and 2015, Prosper capitalized $225 thousand and $175 thousand respectively, of stock-based compensation as internal use software and website development costs. During the six months ended June 30, 2016 and 2015, Prosper capitalized $436 thousand and $297 thousand respectively, of stock-based compensation as internal use software and website development costs. As of June 30, 2016, the unamortized stock-based compensation expense adjusted for forfeiture estimates related to Prosper’s employees’ unvested stock-based awards was approximately $58.6 million, which will be recognized over the remaining weighted-average vesting period of approximately 2.77 years. Management modified or accelerated the vesting terms for certain employee options, which resulted in an additional $0.7 million and $0.1 million of stock-based compensation expense for the three months ended June 30, 2016 and 2015, respectively.

Restructuring

Restructuring	6 Months Ended
	Jun. 30, 2016
Restructuring And Related Activities [Abstract]
Restructuring	14. Restructuring Summary of Restructuring Plan On May 3, 2016, Prosper adopted a strategic restructuring of its business. This restructuring is intended to streamline our operations and support future growth efforts. Under this restructuring, Prosper closed its Salt Lake City, Utah location. As a result of this restructuring, Prosper will terminate 167 employees across all locations. In connection with the restructuring, Prosper has recognized employee severance and benefits charges of approximately $5.4 million in the second quarter which were included in “Restructuring Charges” within the condensed consolidated statement of operations, and expects to incur $ 0.2 In addition to the employment costs associated with the restructuring, Prosper is also engaged in marketing for sublease, space in our existing office space that is no longer needed due to the reduction in headcount. In total, the losses incurred on the leases in San Francisco, Salt Lake City and Phoenix totaled $8.7 million which has been included in “Restructuring Charges” within the condensed consolidated statement of operations. Prosper expects to incur an additional $ 0.2 The following table summarizes the activities related to Prosper's restructuring plan (in thousands) : Severance Related * Facilities Related Total Balance April 1, 2016 $ - $ - $ - Additions to expense 5,400 8,661 14,061 Transfer from deferred rent - 764 764 Less: Cash paid (3,362 ) (933 ) (4,295 ) Balance June 30, 2016 $ 2,038 $ 8,492 $ 10,530 * Severance related restructuring costs excludes non-cash charges related to vesting of equity incentives for fully-vested employees terminated as part of the Restructuring of $45 thousand

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2016
Income Taxes [Line Items]
Income Taxes	15. Income Taxes For the three months ended June 30, 2016 and 2015, Prosper recognized $105 thousand and $176 thousand of income tax expense, respectively. For the six months ended June 30, 2016 and 2015, Prosper recognized $270 thousand and $249 thousand of income tax expense, respectively. The income tax expense relates to state income tax expense and the amortization of tax deductible goodwill which gives rise to an indefinite-lived deferred tax liability. No other income tax expense or benefit was recorded for the six month periods ended June 30, 2016 and 2015 due to a full valuation allowance recorded against our deferred tax assets. Management assesses the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize our existing deferred tax assets. On the basis of this evaluation, it is not more likely than not that our deferred tax assets will be realized and therefore a full valuation allowance has been recorded.
Prosper Funding LLC [Member]
Income Taxes [Line Items]
Income Taxes	6. Income Taxes Prosper Funding incurred no income tax provision for the six months ended June 30, 2016 and 2015. Prosper Funding is a US disregarded entity and its income and loss is included in the return of its parent, PMI. Since PMI is in a loss position, is not currently subject to income taxes, and has fully reserved its deferred tax asset, the net effective tax rate for Prosper Funding is 0%.

Commitments and Contingencies

Commitments and Contingencies	6 Months Ended
	Jun. 30, 2016
Commitments and Contingencies	16. Commitments and Contingencies Future Minimum Lease Payments Prosper has entered into various non-cancelable operating leases for certain offices with contractual lease periods expiring between 2022 and 2027. Future minimum rental payments under these leases as of June 30, 2016 are as follows (in thousands): Remaining six months of 2016 3,674 2017 8,888 2018 9,524 2019 9,732 2020 10,225 2021 10,313 Thereafter 26,102 Total future operating lease obligations $ 78,458 Rental expense under operating lease arrangements was $1.9 million and $0.9 million for the three months ended June 30, 2016 and 2015, respectively. Rental expense under operating lease arrangements was $3.7 million and $1.7 million for the six months ended June 30, 2016 and 2015, respectively. Operating Commitments Prosper has an agreement with WebBank, under which all Borrower Loans originated through the marketplace are made by WebBank under its bank charter. The arrangement allows for Borrower Loans to be offered to borrowers at uniform nationwide terms. Prosper is required to pay the greater of a monthly minimum fee or a fee calculated based on a certain percentage of monthly Borrower Loan origination volume. The minimum fee for the remaining six months ended December 31, 2016 is $0.8 million. The minimum fee is $1.7 million, $1.7 million and $1.0 million for years 2017, 2018 and 2019, respectively. Loan Purchase Commitments Prosper has entered into an agreement with WebBank to purchase $7.8 million of Borrower Loans that WebBank originated during the last business day of the quarter ended June 30, 2016 and the first business day of the quarter ending September 30, 2016. Prosper Repurchase and Indemnification Contingency Under the terms of the loan purchase agreements between Prosper and investors that participate in the Whole Loan Channel, Prosper may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow loan listing or bidding protocols, or a violation of the applicable federal, state, or local lending laws. The fair value of the indemnification and repurchase obligation is estimated based on historical experience and the initial fair value is insignificant. Prosper recognizes a liability for the repurchase and indemnification obligation when the Borrower Loans are issued. Indemnified or repurchased Borrower Loans associated with violations of federal, state, or local lending laws or verifiable identity theft are written off at the time of repurchase or at the time an indemnification payment is made. The maximum potential amount of future payments associated under this obligation is the outstanding balances of the Borrower Loans issued through the Whole Loan Channel, which at June 30, 2016 is $4,063 million. Prosper has accrued $489 thousand and $510 thousand as of June 30, 2016 and December 31, 2015, respectively, in regard to this obligation. Securities Law Compliance From inception through October 16, 2008, Prosper sold approximately $178.0 million of Borrower Loans to investors through its old platform structure, whereby Prosper assigned promissory notes directly to investors. Prosper did not register the offer and sale of the promissory notes corresponding to these Borrower Loans under the Securities Act or under the registration or qualification provisions of any state securities laws. Prosper 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, Prosper would have failed to comply with the registration and qualification requirements of federal and state laws. In 2008, plaintiffs filed a class action lawsuit against Prosper 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 Prosper offered and sold unqualified and unregistered securities in violation of the California and federal securities laws. On July 19, 2013 solely to avoid the costs, risks and uncertainties inherent in litigation, and without admitting any liability or wrongdoing, the parties to the class action litigation agreed to enter into a settlement to resolve all claims related thereto (the “Settlement”). In connection with the Settlement, Prosper agreed to pay an aggregate amount of $10 million into a settlement fund, split into four annual installments of $2 million in 2014, $2 million in 2015, $3 million in 2016 and $3 million in 2017. The Settlement received final approval in a final order and judgment entered by the Superior Court on April 16, 2014. Pursuant to the final order and judgment, the claims in the class action were dismissed, and the defendants were released by the plaintiffs from all claims that were or could have been asserted concerning the issues alleged in the class action lawsuit. The first three annual installments have been made prior to June 30, 2016 and the reserve for the class action settlement liability is $3.0 million in the condensed consolidated balance sheet as of June 30, 2016.
Prosper Funding LLC [Member]
Commitments and Contingencies	8. Commitments and Contingencies Operating Commitments Prosper Funding has an agreement with WebBank, under which Prosper Funding is required to pay WebBank the greater of a monthly minimum fee or a fee calculated based on a certain percentage of Borrower Loans purchased by Prosper Funding. The minimum fee for the remaining six months of 2016 is $0.8 million. The minimum fee is $1.7 million, $1.7 million and $1.0 million for years 2017, 2018 and 2019 respectively. Loan Purchase Commitments Under the terms of Prosper Funding’s agreement with WebBank, Prosper Funding is committed to purchase $7.8 million of Borrower Loans that WebBank originated during the last business day of the quarter ended June 30, 2016 and first business day of the quarter ended September 30, 2016. Prosper Repurchase and Indemnification Contingency Under the terms of the loan purchase agreements between Prosper Funding and investor members that participate in the Whole Loan Channel, Prosper Funding may, in certain circumstances, become obligated to repurchase a Borrower Loan from an investor member. Generally, these circumstances include the occurrence of verifiable identity theft, the failure to properly follow loan listing or bidding protocols, or a violation of the applicable federal, state, or local lending laws. The fair value of the indemnification and repurchase obligation is estimated based on historical experience. Prosper Funding recognizes a liability for the repurchase and indemnification obligation when the Borrower Loans are issued. Indemnified or repurchased Borrower Loans associated with violations of federal, state, or local lending laws or verifiable identity theft are written off at the time of repurchase or at the time an indemnification payment is made. The maximum potential amount of future payments associated under this obligation is the outstanding balances of the Borrower Loans issued through the Whole Loan Channel, which at June 30, 2016 is $3,911 million. Prosper Funding had accrued $439 thousand and $460 thousand as of June 30, 2016 and December 31, 2015, respectively, in regard to this obligation.

Related Parties

Related Parties	6 Months Ended
	Jun. 30, 2016
Related Parties	17. Related Parties Since Prosper’s inception, it has engaged in various transactions with its directors, executive officers and holders of more than 10% of its voting securities, and immediate family members and other affiliates of its directors, executive officers and 10% stockholders. Prosper believes that all of the transactions described below were made on terms no less favorable to Prosper than could have been obtained from unaffiliated third parties. Prosper’s executive officers, directors who are not executive officers, and certain affiliates participate in its marketplace by placing bids and purchasing Notes and Borrower Loans. The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three and six months ended June 30, 2016 and 2015, as well as the Notes and Borrower Loans outstanding as of June 30, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Six Months Ended June 30, Six Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 801 $ 846 $ 110 $ 98 Directors (excluding executive officers and management) 350 20 15 4 Total $ 1,151 $ 866 $ 125 $ 102 Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Three Months Ended June 30, Three Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 396 $ 365 $ 61 $ 51 Directors (excluding executive officers and management) 114 - 9 2 Total $ 510 $ 365 $ 70 $ 53 Notes and Borrower Loans Balance as of Related Party June 30, 2016 December 31, 2015 Executive officers and management $ 1,822 $ 1,912 Directors (excluding executive officers and management) 528 325 $ 2,350 $ 2,237
Prosper Funding LLC [Member]
Related Parties	9. Related Parties Since inception, Prosper Funding has engaged in various transactions with its directors, executive officers and sole member, and immediate family members and other affiliates of its directors, executive officers and sole member. Prosper Funding believes that all of the transactions described below were made on terms no less favorable to Prosper Funding than could have been obtained from unaffiliated third parties. Prosper Funding’s executive officers and directors who are not executive officers participate in its marketplace by placing bids and purchasing Notes and Borrower Loans. The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be related parties of Prosper Funding as of June 30, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Six Months Ended June 30, Six Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 801 $ 846 $ 110 $ 98 Directors (excluding executive officers and management) - - - - Total $ 801 $ 846 $ 110 $ 98 Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Three Months Ended June 30, Three Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 396 $ 365 $ 61 $ 51 Directors (excluding executive officers and management) - - - - Total $ 396 $ 365 $ 61 $ 51 Note and Borrower Loan Balance as of Related Party June 30, 2016 December 31, 2015 Executive officers and management $ 1,822 $ 1,912 Directors (excluding executive officers and management) - - $ 1,822 $ 1,912

Subsequent Events

Subsequent Events	6 Months Ended
	Jun. 30, 2016
Subsequent Events [Abstract]
Subsequent Events	18. Subsequent Events On July 1, 2016, Prosper and WebBank, an FDIC-insured, Utah-chartered industrial bank (“WebBank”), entered into (i) an Asset Sale Agreement between Prosper Funding and WebBank (the “Sale Agreement”), (ii) a Marketing Agreement between PMI and WebBank (the “Marketing Agreement”), and (iii) a Stand By Purchase Agreement between PMI and WebBank (the “Purchase Agreement,” and collectively, the “Origination and Sale Agreements”). As of the effective date of August 1, 2016 these agreements replace the existing agreements with WebBank. The Origination and Sale Agreements set forth the respective obligations of the Registrants and WebBank with respect to the origination and sales activities of consumer loans originated on or after August 1, 2016. Under the Sale Agreement, WebBank sells and assigns certain consumer loans or related participation rights to Prosper Funding. As consideration for WebBank’s agreement to sell and assign such consumer loans or related participation rights, Prosper Funding agrees to pay WebBank certain fees in addition to the purchase price of such consumer loans or participation rights. Under the Marketing Agreement, PMI identifies customers who qualify for WebBank’s consumer loans, markets such loan programs and provides an online interface and other operational services in support of such consumer loan program. WebBank pays PMI a marketing fee in consideration for PMI’s marketing and other activities under the consumer loan program. Under the Purchase Agreement, PMI has agreed to purchase consumer loans or related participation rights from WebBank in the event that Prosper Funding fails to purchase loans or participation rights that it is obligated to purchase under the Sale Agreement. The initial term of each of the Origination and Sale Agreements is three years. As a result of entering into these agreements, on August 1 st

Summary of Significant Accoun25

Summary of Significant Accounting Policies (Policies)	6 Months Ended
	Jun. 30, 2016
Significant Accounting Policies [Line Items]
Basis of Presentation	Prosper Marketplace, Inc. (“PMI”) was incorporated in the state of Delaware on March 22, 2005. Except as the context requires otherwise, as used in these n otes to the condensed consolidated financial statements of Prosper Marketplace, Inc., “Prosper,” “we,” “us,” and “our” refer to PMI and its wholly-owned subsidiaries, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2015. The balance sheet at December 31, 2015 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. The preparation of Prosper’s condensed consolidated financial statements and related disclosures in conformity with GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in Prosper’s financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material. The accompanying interim condensed consolidated financial statements include the accounts of PMI and its wholly-owned subsidiaries. All intercompany balances have been eliminated in consolidation. On January 23, 2015, PMI acquired all of the outstanding limited liability company units of American HealthCare Lending, LLC (“American HealthCare Lending”), a company that operated a patient financing platform, and merged American HealthCare Lending with and into Prosper Healthcare Lending LLC (“PHL”), a newly established entity surviving the merger. Prosper’s condensed consolidated financial statements include PHL’s results of operations and financial position from the date of acquisition forward. On October 9, 2015, PMI acquired all of the outstanding stock of BillGuard, Inc. (“BillGuard”), a company incorporated in Delaware in 2010 that developed applications that help consumers manage their identity, finances and credit. PMI merged BillGuard with and into Beach Merger Sub, Inc., a newly established entity wholly owned by PMI, with BillGuard surviving the merger. Prosper’s condensed consolidated financial statements include BillGuard’s results of operations and financial position from the date of acquisition forward.
Reclassifications	Reclassifications During the period ended June 30, 2016, Prosper changed the presentation of its revenue in the condensed consolidated statements of operations. A new line called “Gain on Sales of Borrower Loans” was created with the amounts included in this line previously classified as “Other Revenue”. Prior period amounts have been reclassified to conform to the current presentation. Additionally, due to the early adoption of ASU 2016-09 on January 1, 2016, reclassifications were made to the financing section of the condensed consolidated statements of cash flows to reflect taxes paid for awards vested under equity incentive plans. Prior period amounts have been reclassified to conform to the current presentation.
Fair Value Measurements	Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Available for Sale Investments at Fair Value, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature.
Restructuring Charges	Restructuring Charges Restructuring
Borrower Loans, Loans Held for Sale and Notes	Borrower Loans, Loans Held for Sale and Notes Through the Note Channel, Prosper purchases Borrower Loans from WebBank then issues Notes, and holds the Borrower Loans until maturity. The obligation to repay a series of Notes issued through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans funded and Notes issued through the Note Channel are carried on Prosper’s condensed consolidated balance sheets as assets and liabilities, respectively. We choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the readers of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. Prosper estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies that take into account expected prepayments, losses, recoveries and default rates. The Borrower Loans are not derecognized when a corresponding Note is issued as Prosper maintains the ability to sell the Borrower Loans without the approval of the holders of the corresponding Notes.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, as part of its ongoing efforts to assist in the convergence of US GAAP and International Financial Reporting Standards (“IFRS”), the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers In November 2014, the FASB issued ASU 2014-16, Derivatives and Hedging (Topic 815): Determining Whether the Host Contract in a Hybrid Financial Instrument Issued in the Form of a Share Is More Akin to Debt or to Equity to eliminate the use of different methods in practice and thereby reduce existing diversity in the accounting for hybrid financial instruments issued in the form of a share. For hybrid financial instruments issued in the form of a share, an entity should determine the nature of the contract by considering the economic characteristics and risks of the entire hybrid financial instrument. The existence or omission of any single term or feature does not necessarily determine the economic characteristics and risks of the host contract. This standard will be effective for fiscal years and interim periods within those fiscal years, beginning after December 15, 2015. In April 2015, the FASB issued ASU 2015-05 “ Customers’ Accounting for Fees Paid in Cloud Computing Arrangement ”, which became effective for the . The guidance changes what a customer must consider in determining whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in accordance with guidance related to internal use software; if the arrangement does not contain a software license, the customer would account for the arrangement as a service contract. In September 2015, the FASB issued ASU 2015-16, Simplifying the Accounting for Measurement-Period Adjustments. The new guidance simplifies the accounting for measurement period adjustments in connection with business combinations by requiring that an acquirer recognize adjustments to provisional amounts that are identified during the measurement period in the reporting period in which the adjustment amounts are determined. This guidance is effective for financial statements issued for fiscal years, and interim periods within those fiscal years, beginning after December 15, 2015. In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842) In March 2016, the FASB issued ASU 2016-09, Improvements to Employee Share-Based Payment Accounting (Topic 718).
Prosper Funding LLC [Member]
Significant Accounting Policies [Line Items]
Basis of Presentation	Prosper Funding LLC (“PFL”) was formed in the state of Delaware on February 17, 2012 as a limited liability company with the sole equity member being Prosper Marketplace, Inc. (“PMI”). Except as the context otherwise requires, as used in these Notes to the condensed consolidated financial statements of Prosper Funding LLC, “Prosper Funding,” “we,” “us,” and “our” refers to PFL and its wholly owned subsidiary, Prosper Asset Holdings LLC (“PAH”), a Delaware limited liability company, on a consolidated basis. The unaudited interim condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (“US GAAP”) and disclosure requirements for interim financial information and the requirements of Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by US GAAP for complete financial statements. The unaudited interim condensed consolidated financial statements should be read in conjunction with the audited financial statements and notes thereto for the year ended December 31, 2015. The balance sheet at December 31, 2015 has been derived from the audited financial statements at that date. Management believes these unaudited interim condensed consolidated financial statements reflect all adjustments, consisting of a normal recurring nature, which are necessary for a fair presentation of the results for the interim periods presented. The results of operations for the interim periods are not necessarily indicative of the results that may be expected for the full year or any other interim period. Prosper Funding did not have any items of other comprehensive income (loss) during any of the periods presented in the condensed consolidated financial statements as of and for the six months ended June 30, 2016 and 2015. The preparation of Prosper Funding's condensed consolidated financial statements and related disclosures in conformity with GAAP requires management to make judgments, assumptions and estimates that affect the amounts reported in its condensed consolidated financial statements and accompanying notes. Management bases its estimates on historical experience and on various other factors it believes to be reasonable under the circumstances, the results of which form the basis for making judgments about the carrying values of certain assets and liabilities. These judgments, estimates and assumptions are inherently subjective in nature and actual results may differ from these estimates and assumptions, and the differences could be material.
Reclassifications	Reclassifications During the period ended June 30, 2016, Prosper Funding changed the presentation of its revenue in the condensed consolidated statements of operations. A new line called “Gain on Sales of Borrower Loans” was created with the amounts included in this line previously classified as “Other Revenue”. The gain on sale related to the sale of Borrower Loans was reclassified from “Other Revenues” to a new line called “Gain on Sales of Borrower Loans.”
Fair Value Measurements	Fair Value Measurements Financial instruments consist principally of Cash and Cash Equivalents, Restricted Cash, Short Term Investments, Borrower Loans, Loans Held for Sale, Accounts Receivable, Accounts Payable and Accrued Liabilities, Payable to Investors and Notes. The estimated fair values of Cash and Cash Equivalents, Restricted Cash, Accounts Receivable, Accounts Payable and Accrued Liabilities, and Payable to Investors approximate their carrying values because of their short term nature.
Borrower Loans, Loans Held for Sale and Notes	Borrower Loans, Loans Held for Sale and Notes Through the Note Channel, Prosper Funding purchases Borrower Loans from WebBank then issues Notes, and holds the Borrower Loans until maturity. The obligation to repay a series of Notes funded through the Note Channel is dependent upon the repayment of the associated Borrower Loan. Borrower Loans and Notes funded through the Note Channel are carried on Prosper Funding’s consolidated balance sheets as assets and liabilities, respectively. We choose to measure certain financial instruments and certain other items at fair value on an instrument-by-instrument basis with unrealized gains and losses on items for which the fair value option has been elected reported in earnings. Management believes that the fair value option is more meaningful for the readers of the financial statements and it allows both the Borrower Loans and Notes to be valued using the same methodology. The fair value election, with respect to an item, may not be revoked once an election is made. Prosper Funding estimates the fair value of such Borrower Loans and Notes using discounted cash flow methodologies that take into account expected prepayments, losses, recoveries and default rates. The Borrower Loans are not derecognized when a corresponding Note is issued as Prosper Funding maintains the ability to sell the Borrower Loans without the approval of the holders of the corresponding Notes.
Recent Accounting Pronouncements	Recent Accounting Pronouncements In May 2014, as part of its ongoing efforts to assist in the convergence of US GAAP and International Financial Reporting Standards (“IFRS”), the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2014-09, “ Revenue from Contracts with Customers In April 2015, the FASB issued ASU 2015-05 “ Customers’ Accounting for Fees Paid in Cloud Computing Arrangement ”, which became effective for the . The guidance changes what a customer must consider in determining whether a cloud computing arrangement contains a software license. If the arrangement contains a software license, the customer would account for the fees related to the software license element in accordance with guidance related to internal use software; if the arrangement does not contain a software license, the customer would account for the arrangement as a service contract.

Property and Equipment, Net (Ta

Property and Equipment, Net (Tables)	6 Months Ended
	Jun. 30, 2016
Property and Equipment, Net	Property and equipment consist of the following (in thousands): June 30, December 31, 2016 2015 Property and equipment: Computer equipment $ 14,153 $ 10,522 Internal-use software and website development costs 14,289 10,990 Office equipment and furniture 3,087 2,442 Leasehold improvements 7,220 5,719 Assets not yet placed in service 1,994 3,242 Property and equipment 40,743 32,915 Less accumulated depreciation and amortization (12,565 ) (7,950 ) Total property and equipment, net $ 28,178 $ 24,965
Prosper Funding LLC [Member]
Property and Equipment, Net	Property and equipment consist of the following (in thousands): June 30, December 31, 2016 2015 Property and equipment: Internal-use software and web site development costs $ 14,289 $ 10,990 Less accumulated depreciation and amortization (4,435 ) (2,571 ) Total property and equipment, net $ 9,854 $ 8,419

Borrower Loans, Loans Held fo27

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value (Tables)	6 Months Ended
	Jun. 30, 2016
Aggregate Principal Balances Outstanding and Fair Values of Borrower Loans, Notes and Loans Held for Sale	The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale and Notes as of June 30, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Aggregate principal balance outstanding $ 312,725 $ 296,945 $ (315,671 ) $ (294,331 ) $ 4,715 $ 42 Fair value adjustments (2,691 ) 328 6,141 (3,074 ) (10 ) (10 ) Fair value $ 310,034 $ 297,273 $ (309,530 ) $ (297,405 ) $ 4,705 $ 32
Prosper Funding LLC [Member]
Aggregate Principal Balances Outstanding and Fair Values of Borrower Loans, Notes and Loans Held for Sale	The aggregate principal balances outstanding and fair values of Borrower Loans, Loans Held for Sale and Notes as of June 30, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 June 30, 2016 December 31, 2015 Aggregate principal balance outstanding $ 312,725 $ 296,945 $ (315,671 ) $ (294,331 ) $ 4,715 $ 42 Fair value adjustments (2,691 ) 328 6,141 (3,074 ) (10 ) (10 ) Fair value $ 310,034 $ 297,273 $ (309,530 ) $ (297,405 ) $ 4,705 $ 32

Available for Sale Investment28

Available for Sale Investments, at Fair Value (Tables)	6 Months Ended
	Jun. 30, 2016
Investments Debt And Equity Securities [Abstract]
Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Securities Available for Sale	The amortized cost, gross unrealized gains and losses, and fair value of available for sale investments as of June 30, 2016 and December 31, 2015, are as follows: June 30, 2016 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 37,453 $ 49 $ (9 ) $ 37,493 Commercial paper 3,899 - - 3,899 US Treasury securities 10,533 28 - 10,561 Agency bonds 2,499 11 - 2,510 Total fixed maturity securities 54,384 88 (9 ) 54,463 Short term bond funds 1,250 - - 1,250 Total Available for Sale Investments $ 55,634 $ 88 $ (9 ) $ 55,713 December 31, 2015 Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 50,327 $ 1 $ (94 ) $ 50,234 Commercial paper 9,493 - - 9,493 US Treasury securities 8,512 - (41 ) 8,471 Agency bonds 2,499 - (8 ) 2,491 Total fixed maturity securities 70,831 1 (143 ) 70,689 Short term bond funds 2,500 - (2 ) 2,498 Total Available for Sale Investments $ 73,331 $ 1 $ (145 ) $ 73,187
Summary of Securities Available for Sale of Continuous Unrealized Loss	A summary of available for sale investments with unrealized losses as of June 30, 2016, and December 31, 2015, aggregated by category and period of continuous unrealized loss, is as follows: Less than 12 months 12 months or longer Total June 30, 2016 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 9,753 $ (9 ) $ - $ - $ 9,753 $ (9 ) U.S. treasury securities - - - - - - Agency bonds - - - - - - Total fixed maturity securities 9,753 (9 ) - - 9,753 (9 ) Short term bond funds - - - - - - Total Investments with Unrealized Losses $ 9,753 $ (9 ) $ - $ - $ 9,753 $ (9 ) Less than 12 months 12 months or longer Total December 31, 2015 Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 45,375 $ (94 ) $ - $ - $ 45,375 $ (94 ) U.S. treasury securities 8,471 (41 ) - - 8,471 (41 ) Agency bonds 2,491 (8 ) - - 2,491 (8 ) Total fixed maturity securities 56,337 (143 ) - - 56,337 (143 ) Short term bond funds 2,498 (2 ) - - 2,498 (2 ) Total Investments with Unrealized Losses $ 58,835 $ (145 ) $ - $ - $ 58,835 $ (145 )
Schedule of Maturities of Securities Available for Sale	The maturities of available for sale investments at June 30, 2016, and December 31, 2015, are as follows: June 30, 2016 Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 28,677 $ 8,816 $ - $ - $ 37,493 Commercial paper 3,899 - - - 3,899 US Treasury securities 3,006 7,555 - - 10,561 Agency bonds - 2,510 - - 2,510 Total Fair Value $ 35,582 $ 18,881 $ - $ - $ 54,463 Total Amortized Cost $ 35,560 $ 18,824 $ - $ - $ 54,384 December 31, 2015 Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 26,289 $ 23,945 $ - $ - $ 50,234 Commercial paper 9,493 - - - 9,493 US Treasury securities - 8,471 - - 8,471 Agency bonds - 2,491 - - 2,491 Total Fair Value $ 35,782 $ 34,907 $ - $ - $ 70,689 Total Amortized Cost $ 35,831 $ 35,000 $ - $ - $ 70,831

Fair Value of Assets and Liab29

Fair Value of Assets and Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value	The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands) June 30, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 310,034 $ 310,034 Loans Held for Sale - - 4,705 4,705 Available for Sale Investments, at Fair Value - 55,713 - 55,713 Servicing Assets - - 14,297 14,297 Total Assets - 55,713 329,036 384,749 Liabilities: Notes $ - $ - $ 309,530 $ 309,530 Servicing Liabilities - - 324 324 Contingent Consideration - - 4,929 4,929 Total Liabilities $ - $ - $ 314,783 $ 314,783 December 31, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 297,273 $ 297,273 Loans Held for Sale - - 32 32 Available for Sale Investments, at Fair Value - 73,187 - 73,187 Servicing Assets - - 14,363 14,363 Total Assets - 73,187 311,668 384,855 Liabilities: Notes $ - $ - $ 297,405 $ 297,405 Servicing Liabilities - - 484 484 Contingent Consideration - - 4,801 4,801 Total Liabilities $ - $ - $ 302,690 $ 302,690
Quantitative Information About Significant Unobservable Inputs	Borrower Loans, Loans Held for Sale and Notes: Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 4.4% - 15.0% 4.3% - 14.5% Default rate 1.6% - 14.8% 1.4% - 14.4%
Significant Unobservable Inputs Fair Value	Servicing Rights Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.0% 1.2% - 14.7% Prepayment rate 14.8% - 27.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 %
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The following tables present additional information about level 3 Borrower Loans, Loans Held for Sale and Notes measured at fair value on a recurring basis (in thousands) Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at January 1, 2016 $ 297,273 $ (297,405 ) $ 32 $ (100 ) Purchase of Borrower Loans/Issuance of Notes 109,215 (109,147 ) 1,358,011 1,358,079 Principal repayments (82,376 ) 83,119 (136 ) 607 Borrower Loans sold to third parties (1,138 ) 1,081 (1,353,202 ) (1,353,259 ) Other changes (6 ) (33 ) - (39 ) Change in fair value (12,934 ) 12,855 - (79 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at January 1, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Purchase of Borrower Loans/Issuance of Notes 94,512 (94,575 ) 1,402,499 1,402,436 Principal repayments (73,457 ) 73,509 (543 ) (491 ) Borrower Loans sold to third parties - - (1,408,883 ) (1,408,883 ) Other changes (130 ) 136 (9 ) (3 ) Change in fair value (9,968 ) 10,085 (96 ) 21 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 Purchase of Borrower Loans/Issuance of Notes 46,805 (46,779 ) 861,574 861,600 Principal repayments (37,395 ) 37,440 (157 ) (112 ) Borrower Loans sold to third parties - - (861,574 ) (861,574 ) Other changes (136 ) (71 ) (1 ) (208 ) Change in fair value (5,478 ) 5,583 (10 ) 95 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 Purchase of Borrower Loans/Issuance of Notes 54,044 (53,873 ) 426,591 426,762 Principal repayments (41,390 ) 41,057 (131 ) (464 ) Borrower Loans sold to third parties (525 ) 499 (421,784 ) (421,810 ) Other changes (2 ) (191 ) - (193 ) Change in fair value (5,336 ) 5,335 (1 ) (2 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209
Schedule of Servicing Assets and Liabilities Measured at Fair Value	The following tables present additional information about level 3 servicing assets and liabilities measured at fair value on a recurring basis (in thousands): Servicing Assets Servicing Liabilities Fair Value at January 1, 2016 14,363 484 Additions 5,750 9 Less: Changes in fair value (5,816 ) (169 ) Fair Value at June 30, 2016 14,297 324 Servicing Assets Servicing Liabilities Amortized Cost at January 1, 2015 4,163 624 Adjustment to Adopt Fair Value Measurement 546 (29 ) Fair Value at January 1, 2015 4,709 595 Additions 5,837 193 Less: Changes in fair value (1,864 ) (182 ) Fair Value at June 30, 2015 8,682 606 Servicing Assets Servicing Liabilities Fair Value at April 1, 2016 15,548 398 Additions 1,729 - Less: Changes in fair value (2,980 ) (74 ) Fair Value at June 30, 2016 14,297 324 Servicing Assets Servicing Liabilities Fair Value at April 1, 2015 6,034 668 Additions 3,759 39 Less: Changes in fair value (1,111 ) (101 ) Fair Value at June 30, 2015 8,682 606
Fair Value Assumptions for Loans Held for Sale, Borrower Loans and Notes	Key economic assumptions and the sensitivity of the current fair value to immediate changes in those assumptions at June 30, 2016 for Borrower Loans, Loans Held for Sale and Notes funded through the Note Channel are presented in the following table (in thousands, except percentages): Borrower Loans and Loans Held for Sale Notes Discount rate assumption: 7.25 %* 7.25 %* Resulting fair value from: 100 basis point increase $ 306,868 $ 306,363 200 basis point increase 303,781 303,277 Resulting fair value from: 100 basis point decrease $ 313,283 $ 312,780 200 basis point decrease 316,619 316,116 Default rate assumption: 11.02 %* 11.02 %* Resulting fair value from: 100 basis point increase $ 306,882 $ 306,370 200 basis point increase 303,823 303,303 Resulting fair value from: 100 basis point decrease $ 313,200 $ 312,704 200 basis point decrease 316,399 315,913 * Represents weighted average assumptions considering all credit grades.
Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities	The following table presents the estimated impact on Prosper’s estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of June 30, 2016 (in thousands, except percentages). Servicing Assets Servicing Liabilities Market servicing rate assumptions 0.625 % 0.625 % Resulting fair value from: Market servicing rate increase to 0.65% 13,252 $ 356 Market servicing rate decrease to 0.60% 15,342 $ 291 Weighted average prepayment assumptions 20.44 % 20.44 % Resulting fair value from: Applying a 1.1 multiplier to prepayment rate 13,918 $ 303 Applying a 0.9 multiplier to prepayment rate 14,451 $ 314 Weighted average default assumptions 11.39 % 11.39 % Resulting fair value from: Applying a 1.1 multiplier to default rate $ 14,067 $ 323 Applying a 0.9 multiplier to default rate $ 14,530 $ 323
Prosper Funding LLC [Member]
Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value	The following tables present the fair value hierarchy for assets and liabilities measured at fair value (in thousands): June 30, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 310,034 $ 310,034 Loans Held for Sale - - 4,705 4,705 Servicing Assets - - 13,798 13,798 Total Assets - - 328,537 328,537 Liabilities: Notes $ - $ - $ 309,530 $ 309,530 Servicing Liabilities - - 324 324 Total Liabilities $ - $ - $ 309,854 $ 309,854 December 31, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 297,273 $ 297,273 Loans Held for Sale - - 32 32 Servicing Assets - - 13,605 13,605 Total Assets - - 310,910 310,910 Liabilities: Notes $ - $ - $ 297,405 $ 297,405 Servicing Liabilities - - 484 484 Total Liabilities $ - $ - $ 297,889 $ 297,889
Quantitative Information About Significant Unobservable Inputs	The following tables present quantitative information about the significant unobservable inputs used for Prosper Funding’s level 3 fair value measurements at June 30, 2016 and December 31, 2015 : Borrower Loans, Loans Held for Sale and Notes: Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 4.4% - 15.0% 4.3% - 14.5% Default rate 1.6% - 14.8% 1.4% - 14.4%
Significant Unobservable Inputs Fair Value	Servicing Rights Range Unobservable Input June 30, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.0% 1.2% - 14.7% Prepayment rate 14.8% - 27.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 %
Assets and Liabilities Measured at Fair Value on a Recurring Basis	The changes in the Borrower Loans, Loans Held for Sale and Notes, which are Level 3 assets and liabilities measured at fair value on a recurring basis are as follows (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at January 1, 2016 $ 297,273 $ (297,405 ) $ 32 $ (100 ) Originations 109,215 (109,147 ) 1,358,011 1,358,079 Principal repayments (82,376 ) 83,119 (136 ) 607 Borrower Loans sold to third parties (1,138 ) 1,081 (1,353,202 ) (1,353,259 ) Other changes (6 ) (33 ) - (39 ) Change in fair value (12,934 ) 12,855 - (79 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at January 1, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Originations 94,512 (94,575 ) 1,402,499 1,402,436 Principal repayments (73,457 ) 73,509 (543 ) (491 ) Borrower Loans sold to third parties - - (1,408,883 ) (1,408,883 ) Other changes (130 ) 136 (9 ) (3 ) Change in fair value (9,968 ) 10,085 (96 ) 21 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Loans Held for Borrower Notes Sale Total Balance at April 1, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 Originations 46,805 (46,779 ) 861,574 861,600 Principal repayments (37,395 ) 37,440 (157 ) (112 ) Borrower Loans sold to third parties - - (861,574 ) (861,574 ) Other changes (136 ) (71 ) (1 ) (208 ) Change in fair value (5,478 ) 5,583 (10 ) 95 Balance at June 30, 2015 $ 284,200 $ (284,628 ) $ 1,431 $ 1,003 Fair Value Measurements Using Significant Unobservable Inputs (Level 3) Borrower Loans Notes Loans Held for Sale Total Balance at April 1, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 Purchase of Borrower Loans/Issuance of Notes 54,044 (53,873 ) 426,591 426,762 Principal repayments (41,390 ) 41,057 (131 ) (464 ) Borrower Loans sold to third parties (525 ) 499 (421,784 ) (421,810 ) Other changes (2 ) (191 ) - (193 ) Change in fair value (5,336 ) 5,335 (1 ) (2 ) Balance at June 30, 2016 $ 310,034 $ (309,530 ) $ 4,705 $ 5,209
Schedule of Servicing Assets and Liabilities Measured at Fair Value	The following table presents additional information about Level 3 servicing assets and liabilities recorded at fair value for the three months ended June 30, 2016 (in thousands). Servicing Servicing Assets Liabilities Fair Value at January 1, 2016 13,605 484 Additions 5,750 9 Less: Changes in fair value (5,557 ) (169 ) Fair Value at June 30, 2016 13,798 324 Servicing Assets Servicing Liabilities Amortized Cost at January 1, 2015 3,116 624 Adjustment to Adopt Fair Value Measurement 399 (29 ) Fair Value at January 1, 2015 3,515 595 Additions 5,837 193 Less: Transfers to PMI (249 ) - Less: Changes in fair value (1,469 ) (182 ) Fair Value at June 30, 2015 7,634 606 Servicing Servicing Assets Liabilities Fair Value at April 1, 2016 14,929 398 Additions 1,729 - Less: Changes in fair value (2,860 ) (74 ) Fair Value at June 30, 2016 13,798 324 Servicing Assets Servicing Liabilities Fair Value at April 1, 2015 4,782 668 Additions 3,759 39 Less: Transfers to PMI - - Less: Changes in fair value (907 ) (101 ) Fair Value at June 30, 2015 7,634 606
Fair Value Assumptions for Loans Held for Sale, Borrower Loans and Notes	Key economic assumptions and the sensitivity of the current fair value to immediate changes in those assumptions at June 30, 2016 for Borrower Loans, Loans Held for Sale and Notes funded are presented in the following table (in thousands): Borrower Loans and Loans Held for Sale Notes Discount rate assumption: 7.25 %* 7.25 %* Resulting fair value from: 100 basis point increase $ 306,868 $ 306,363 200 basis point increase 303,781 303,277 Resulting fair value from: 100 basis point decrease $ 313,283 $ 312,780 200 basis point decrease 316,619 316,116 Default rate assumption: 11.02 %* 11.02 %* Resulting fair value from: 100 basis point increase $ 306,882 $ 306,370 200 basis point increase 303,823 303,303 Resulting fair value from: 100 basis point decrease $ 313,200 $ 312,704 200 basis point decrease 316,399 315,913
Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities	The following table presents the estimated impact on Prosper Funding’s estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of June 30, 2016 (in thousands, except percentages). Servicing Assets Servicing Liabilities Market servicing rate assumptions 0.625 % 0.625 % Resulting fair value from: Market servicing rate increase to 0.65% 12,952 356 Market servicing rate decrease to 0.60% 14,995 291 Weighted average prepayment assumptions 20.44 % 20.44 % Resulting fair value from: Applying a 1.1 multiplier to default rate 13,541 303 Applying a 0.9 multiplier to default rate 14,059 314 Weighted average default assumptions 11.39 % 11.39 % Resulting fair value from: Applying a 1.1 multiplier to default rate 13,576 323 Applying a 0.9 multiplier to default rate 14,023 323

Goodwill and Other Intangible30

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Other Intangible Assets for the Period Presented	The following table presents the detail of other intangible assets for the period presented (dollars in thousands): June 30, 2016 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) User base and customer relationships $ 6,250 $ (1,976 ) $ 4,274 8.6 Developed technology 8,310 (1,508 ) $ 6,802 4.3 Brand name 60 (60 ) - - Total intangible assets subject to amortization $ 14,620 $ (3,544 ) $ 11,076
Summary of Estimated Amortization of Purchased Intangible Assets	Estimated amortization of purchased intangible assets for future periods is as follows (in thousands): Year Ending December 31, 2016 $ 1,862 2017 3,260 2018 2,329 2019 1,779 2020 1,344 Thereafter 502 Total $ 11,076

Other Liabilities (Tables)

Other Liabilities (Tables)	6 Months Ended
	Jun. 30, 2016
Other Liabilities [Abstract]
Schedule of Other Liabilities	Other Liabilities includes the following: June 30, 2016 December 31, 2015 Class action settlement liability $ 2,973 $ 5,949 Repurchase liability for unvested restricted stock awards 267 473 Contingent consideration 4,929 4,801 Deferred revenue 420 1,591 Servicing liabilities 324 484 Deferred rent 4,647 5,240 Restructuring liability 8,492 - Other 2,364 2,197 Total Other Liabilities $ 24,416 $ 20,735

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	6 Months Ended
	Jun. 30, 2016
Earnings Per Share [Abstract]
Basic and Diluted Net Loss Per Share	Basic and diluted net loss per share was calculated as follows: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Numerator: Net loss available to common stockholders for basic and diluted EPS $ (35,628 ) $ (6,201 ) $ (53,092 ) $ (13,477 ) Denominator: Weighted average shares used in computing basic and diluted net loss per share 63,270,058 55,612,485 61,813,773 54,168,175 Basic and diluted net loss per share $ (0.56 ) $ (0.11 ) $ (0.86 ) $ (0.25 )
Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share	The following common stock equivalents were excluded from the computation of diluted net loss per share for the periods presented because including them would have been anti-dilutive: Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 (shares) (shares) (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding 177,388,425 35,477,685 177,388,425 35,477,685 Stock options issued and outstanding 43,719,604 6,982,320 41,694,271 6,478,422 Unvested stock options exercised 5,345,950 3,084,604 5,345,950 3,084,604 Warrants issued and outstanding 962,113 123,467 792,449 123,467 Total common stock equivalents excluded from diluted net loss per common share computation 227,416,092 45,668,076 225,221,095 45,164,178

Convertible Preferred Stock a33

Convertible Preferred Stock and Stockholders' Deficit (Tables)	6 Months Ended
	Jun. 30, 2016
Stockholders Equity Note [Abstract]
Summary of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock	The number of authorized, issued and outstanding shares, their par value and liquidation preference for each series of convertible preferred stock as of June 30, 2016 are disclosed in the table below (amounts in thousands except share and per share amounts): Convertible Preferred Stock Par Value Authorized shares Outstanding and Issued shares Liquidation Preference New Series A $ 0.01 68,558,220 68,558,220 $ 19,774 Series A-1 0.01 24,760,915 24,760,915 49,522 New Series B 0.01 35,775,880 35,775,880 21,581 New Series C 0.01 24,404,770 24,404,770 70,075 New Series D 0.01 23,888,640 23,888,640 165,000 177,388,425 177,388,425 $ 325,952

Shared Based Incentive Plan a34

Shared Based Incentive Plan and Compensation (Tables)	6 Months Ended
	Jun. 30, 2016
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Activity of Options that were Early Exercised under the Plan	The activity of options that were early exercised under the 2005 Plan for the six months ended June 30, 2016 is below: Early exercised options, unvested Weighted average exercise price Balance as of January 1, 2016 9,806,170 $ 0.05 Repurchase of restricted stock (51,105 ) 0.90 Restricted stock vested (4,409,115 ) 0.04 Balance as of June 30, 2016 5,345,950 $ 0.05
Additional Information Regarding the Unvested Early Exercised Stock Options Outstanding	Additional information regarding the unvested early exercised stock options outstanding as of June 30, 2016 is as follows: Options Outstanding Range of Exercise Number Weighted –Avg. Weighted –Avg. Prices Outstanding Remaining Life Exercise Price 0.02 4,847,590 0.7 $ 0.02 0.11 387,010 1.6 0.11 1.13 111,350 2.1 1.13 $0.02 - $1.13 5,345,950 0.8 $ 0.05
Summarized Option Activity under Option Plan	Stock option activity under the 2005 Plan and 2015 Plan is summarized for the six months ended June 30, 2016 below: Options Issued and Outstanding Weighted- Average Exercise Price Balance as of January 1, 2016 40,425,605 $ 2.64 Options issued 19,655,338 $ 2.14 Options exercised – vested (334,475 ) 0.85 Options forfeited (4,725,406 ) 1.38 Balance as of June 30, 2016 55,021,062 1.54 Options vested and/or exercisable at June 30, 2016 26,856,397 1.15
Additional Information Regarding Common Stock Options Outstanding	Additional information regarding common stock options outstanding as of June 30, 2016 is as follows: Options Outstanding Options Vested and Exercisable Weighted – Weighted – Weighted - Range of Avg. Avg. Avg. Exercise Number Remaining Exercise Number Exercise Prices Outstanding Life Price Vested Price $ 0.02 - 0.99 13,462,825 7.41 $ 0.12 13,462,110 $ 0.12 1.00 - 2.99 38,325,717 9.34 2.04 11,565,657 1.91 3.00 - 4.99 1,586,875 8.63 3.62 1,586,875 3.62 5.00 - 5.52 1,645,645 9.14 5.49 241,755 5.46 $ 0.02 - 5.52 55,021,062 8.84 $ 1.72 26,856,397 $ 1.15
Fair Value of Stock Option Awards	The fair value of PMI’s stock option awards granted during the three months ended June 30, 2016 and 2015 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended Six Months Ended June 30, June 30, 2016 2015 2016 2015 Volatility of common stock 50.88 % 52.75 % 50.88 % 57.26 % Risk-free interest rate 1.29 % 1.80 % 1.29 % 1.72 % Expected life 5.8 years 6.0 years 5.8 years 6.1 years Dividend yield 0 % 0 % 0 % 0 %
Summarized Activities for RSU's	The following table summarizes the activities for PMI’s RSUs during the six months ending June 30, 2016: Number of Shares Weighted-Average Grant Date Fair Value Unvested - December 31, 2015 1,835,510 $ 5.52 Granted 3,580,220 2.14 Vested - - Forfeited (1,274,920 ) 2.14 Unvested - June 30, 2016 4,140,810 $ 2.59
Stock Based Compensation Included in Consolidated Statements of Operations	The following table presents the amount of stock-based compensation related to stock-based awards granted to employees recognized in Prosper’s condensed consolidated statements of operations during the three months ended June 30, 2016 and 2015 (in thousands): Three Months Ended June 30, Six Months Ended June 30, 2016 2015 2016 2015 Origination and servicing $ 579 $ 292 $ 1,018 $ 436 Sales and marketing 896 676 1,632 1,065 General and administrative 4,884 1,784 8,815 2,691 Restructuring 45 - 45 - Total stock based compensation $ 6,404 $ 2,752 $ 11,510 $ 4,192

Restructuring (Tables)

Restructuring (Tables)	6 Months Ended
	Jun. 30, 2016
Restructuring And Related Activities [Abstract]
Summary of Activities Related to Prosper's Restructuring Plan	The following table summarizes the activities related to Prosper's restructuring plan (in thousands) : Severance Related * Facilities Related Total Balance April 1, 2016 $ - $ - $ - Additions to expense 5,400 8,661 14,061 Transfer from deferred rent - 764 764 Less: Cash paid (3,362 ) (933 ) (4,295 ) Balance June 30, 2016 $ 2,038 $ 8,492 $ 10,530 * Severance related restructuring costs excludes non-cash charges related to vesting of equity incentives for fully-vested employees terminated as part of the Restructuring of $45 thousand

Commitments and Contingencies (

Commitments and Contingencies (Tables)	6 Months Ended
	Jun. 30, 2016
Commitments And Contingencies Disclosure [Abstract]
Future Minimum Lease Payments	Prosper has entered into various non-cancelable operating leases for certain offices with contractual lease periods expiring between 2022 and 2027. Future minimum rental payments under these leases as of June 30, 2016 are as follows (in thousands): Remaining six months of 2016 3,674 2017 8,888 2018 9,524 2019 9,732 2020 10,225 2021 10,313 Thereafter 26,102 Total future operating lease obligations $ 78,458

Related Parties (Tables)

Related Parties (Tables)	6 Months Ended
	Jun. 30, 2016
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three and six months ended June 30, 2016 and 2015, as well as the Notes and Borrower Loans outstanding as of June 30, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Six Months Ended June 30, Six Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 801 $ 846 $ 110 $ 98 Directors (excluding executive officers and management) 350 20 15 4 Total $ 1,151 $ 866 $ 125 $ 102 Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Three Months Ended June 30, Three Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 396 $ 365 $ 61 $ 51 Directors (excluding executive officers and management) 114 - 9 2 Total $ 510 $ 365 $ 70 $ 53 Notes and Borrower Loans Balance as of Related Party June 30, 2016 December 31, 2015 Executive officers and management $ 1,822 $ 1,912 Directors (excluding executive officers and management) 528 325 $ 2,350 $ 2,237
Prosper Funding LLC [Member]
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes and Borrower Loans purchased and the income earned by parties deemed to be related parties of Prosper Funding as of June 30, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Six Months Ended June 30, Six Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 801 $ 846 $ 110 $ 98 Directors (excluding executive officers and management) - - - - Total $ 801 $ 846 $ 110 $ 98 Aggregate Amount of Notes and Borrower Loans Purchased Interest Earned on Notes and Borrower Loans Three Months Ended June 30, Three Months Ended June 30, Related Party 2016 2015 2016 2015 Executive officers and management $ 396 $ 365 $ 61 $ 51 Directors (excluding executive officers and management) - - - - Total $ 396 $ 365 $ 61 $ 51 Note and Borrower Loan Balance as of Related Party June 30, 2016 December 31, 2015 Executive officers and management $ 1,822 $ 1,912 Directors (excluding executive officers and management) - - $ 1,822 $ 1,912

Property and Equipment, Net (De

Property and Equipment, Net (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 40,743	$ 32,915
Less accumulated depreciation and amortization	(12,565)	(7,950)
Total property and equipment, net	28,178	24,965
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	(4,435)	(2,571)
Total property and equipment, net	9,854	8,419
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	14,153	10,522
Internal-use Software and Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	14,289	10,990
Internal-use Software and Website Development Costs [Member] | Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	14,289	10,990
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	3,087	2,442
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	7,220	5,719
Assets Not Yet Placed in Service [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,994	$ 3,242

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Property, Plant and Equipment [Line Items]
Depreciation And Amortization			$ 6,430	$ 3,455
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Depreciation And Amortization	$ 981	$ 676	1,864	1,896
Property Plant And Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	2,500	1,400	4,500	3,100
Internal-use Software and Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Capitalized internal-use software and website development costs	$ 1,800	$ 2,100	3,600	3,900
Recorded internal-use software and website development impairment charges			$ 240	$ 0

Borrower Loans, Loans Held fo40

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Aggregate Principal Balances Outstanding and Fair Values of Borrower Loans, Notes and Loans Held for Sale (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair Value	$ 310,034	$ 297,273
Notes at Fair Value	(309,530)	(297,405)
Loans Held for Sale, at Fair Value	4,705	32
Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair Value	310,034	297,273
Notes at Fair Value	(309,530)	(297,405)
Loans Held for Sale, at Fair Value	4,705	32
Notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Notes	(315,671)	(294,331)
Fair value adjustments	6,141	(3,074)
Notes at Fair Value	(309,530)	(297,405)
Notes [Member] | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Notes	(315,671)	(294,331)
Fair value adjustments	6,141	(3,074)
Notes at Fair Value	(309,530)	(297,405)
Borrower Loans [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Borrower Loans	312,725	296,945
Fair value adjustments	(2,691)	328
Borrower Loans, at Fair Value	310,034	297,273
Borrower Loans [Member] | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Borrower Loans	312,725	296,945
Fair value adjustments	(2,691)	328
Borrower Loans, at Fair Value	310,034	297,273
Loans Held for Sale [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustments	(10)	(10)
Aggregate principal balance outstanding, Loans Held for Sale	4,715	42
Loans Held for Sale, at Fair Value	4,705	32
Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Fair value adjustments	(10)	(10)
Aggregate principal balance outstanding, Loans Held for Sale	4,715	42
Loans Held for Sale, at Fair Value	$ 4,705	$ 32

Borrower Loans, Loans Held fo41

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Gain (loss) related to credit risks on borrower loans	$ 300	$ (2,000)
Minimum number of days for which loans originated were delinquent		90 days	90 days
Aggregate principal amount of loans originated	2,000	$ 2,000	$ 2,300
Non accrual status past due date		120 days
Fair value of loans originated	700	$ 700	900
Borrower Loans receivable	200	200	$ 100
Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Gain (loss) related to credit risks on borrower loans	314	$ (2,033)
Minimum number of days for which loans originated were delinquent		90 days	90 days
Aggregate principal amount of loans originated	2,000	$ 2,000	$ 2,300
Non accrual status past due date		120 days
Fair value of loans originated	700	$ 700	900
Borrower Loans receivable	$ 200	$ 200	$ 100
Loans Held For Sale Borrower Loans And Underlying Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower loans original maturity term, description		Original terms to maturity of either 36 or 60 months
Fixed interest rate, Minimum		5.32%
Fixed interest rate, Maximum		33.04%
Loans maturity date		Jun. 30, 2021
Loans Held For Sale Borrower Loans And Underlying Notes | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower loans original maturity term, description		original terms to maturity of either 36 or 60 months
Fixed interest rate, Minimum		5.32%
Fixed interest rate, Maximum		33.04%
Loans maturity date		Jun. 30, 2021
Outstanding Borrower Loans And Underlying Notes
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower loans original maturity term, description		original maturities of either 36 or 60 months
Fixed interest rate, Minimum			5.32%
Fixed interest rate, Maximum			33.04%
Loans maturity date			Dec. 31, 2020
Outstanding Borrower Loans And Underlying Notes | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower loans original maturity term, description		original maturities of either 36 or 60 months
Fixed interest rate, Minimum			5.32%
Fixed interest rate, Maximum			33.04%
Loans maturity date			Dec. 31, 2020

Loan Servicing Assets and Lia42

Loan Servicing Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sale of borrower loans	$ (687)	$ 3,696	$ 3,104	$ 5,618
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Gain (loss) on sale of borrower loans	(687)	3,696	3,104	5,618
Borrower Loans [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	4,100,000		$ 4,100,000		$ 3,800,000
Borrower loans original maturity term, description			Original terms of either 36 or 60 months
Fixed interest rate, Minimum			5.32%		5.32%
Fixed interest rate, Maximum			35.52%		31.90%
Loans maturity date			Jun. 30, 2021		Dec. 31, 2020
Debt instrument servicing rights, Description			As of June 30, 2016, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $4.1 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 35.52% and various maturity dates through June 2021. At December 31, 2015, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $3.8 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 31.90% and various maturity dates through December 2020.
Contractually specified servicing fees, late charges and ancillary fees	10,400	4,600	$ 20,000	7,800
Borrower Loans [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	3,900,000		$ 3,900,000		$ 3,600,000
Borrower loans original maturity term, description			Original terms of either 36 or 60 months
Fixed interest rate, Minimum			5.32%		5.32%
Fixed interest rate, Maximum			35.52%		31.90%
Loans maturity date			Jun. 30, 2021		Dec. 31, 2020
Debt instrument servicing rights, Description			At June 30, 2016, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights, had a total outstanding principal balance of $3.9 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 35.52% and various maturity dates through June 2021. At December 31, 2015, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights, had a total outstanding principal balance of $3.6 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 5.32% to 31.90% and various maturity dates through December 2020.
Contractually specified servicing fees, late charges and ancillary fees	$ 10,300	$ 4,100	$ 19,700	$ 6,800

Available for Sale Investments

Available for Sale Investments at Fair Value - Schedule of Amortized Cost, Gross Unrealized Gains and Losses and Fair Value of Available for Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 55,634	$ 73,331
Gross Unrealized Gains	88	1
Gross Unrealized Losses	(9)	(145)
Available for Sale Investments, at Fair Value	55,713	73,187
Short Term Bond Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	1,250	2,500
Gross Unrealized Losses		(2)
Available for Sale Investments, at Fair Value	1,250	2,498
Fixed Maturity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	54,384	70,831
Gross Unrealized Gains	88	1
Gross Unrealized Losses	(9)	(143)
Available for Sale Investments, at Fair Value	54,463	70,689
Fixed Maturity Securities | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	37,453	50,327
Gross Unrealized Gains	49	1
Gross Unrealized Losses	(9)	(94)
Available for Sale Investments, at Fair Value	37,493	50,234
Fixed Maturity Securities | Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	3,899	9,493
Available for Sale Investments, at Fair Value	3,899	9,493
Fixed Maturity Securities | U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	10,533	8,512
Gross Unrealized Gains	28
Gross Unrealized Losses		(41)
Available for Sale Investments, at Fair Value	10,561	8,471
Fixed Maturity Securities | Agency Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,499	2,499
Gross Unrealized Gains	11
Gross Unrealized Losses		(8)
Available for Sale Investments, at Fair Value	$ 2,510	$ 2,491

Available for Sale Investment44

Available for Sale Investments at Fair Value - Summary of Available for Sale Investments of Continuous Unrealized Loss (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	$ 9,753	$ 58,835
Unrealized losses, less than 12 months	(9)	(145)
Fair Value	9,753	58,835
Unrealized losses	(9)	(145)
Short Term Bond Funds
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months		2,498
Unrealized losses, less than 12 months		(2)
Fair Value		2,498
Unrealized losses		(2)
Fixed Maturity Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	9,753	56,337
Unrealized losses, less than 12 months	(9)	(143)
Fair Value	9,753	56,337
Unrealized losses	(9)	(143)
Fixed Maturity Securities | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	9,753	45,375
Unrealized losses, less than 12 months	(9)	(94)
Fair Value	9,753	45,375
Unrealized losses	$ (9)	(94)
Fixed Maturity Securities | U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months		8,471
Unrealized losses, less than 12 months		(41)
Fair Value		8,471
Unrealized losses		(41)
Fixed Maturity Securities | Agency Bonds
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months		2,491
Unrealized losses, less than 12 months		(8)
Fair Value		2,491
Unrealized losses		$ (8)

Available for Sale Investment45

Available for Sale Investments at Fair Value - Additional Information (Details) - USD ($)	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Segment Reporting [Abstract]
Impairment charges recognized during period		$ 0
Proceeds from Sale of Available for Sale Investments	$ 9,193,000	9,193,000
Available-for-sale investments, realized gains	$ 6,000	$ 6,000

Available for Sale Investment46

Available for Sale Investments at Fair Value - Schedule of Maturities of Available for Sale Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	$ 35,582	$ 35,782
Fair value after 1 year through 5 years	18,881	34,907
Fair value	54,463	70,689
Amortized cost within 1 year	35,560	35,831
Amortized cost after 1 year through 5 years	18,824	35,000
Amortized cost	54,384	70,831
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	28,677	26,289
Fair value after 1 year through 5 years	8,816	23,945
Fair value	37,493	50,234
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	3,899	9,493
Fair value	3,899	9,493
U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	3,006
Fair value after 1 year through 5 years	7,555	8,471
Fair value	10,561	8,471
Agency Bonds
Schedule Of Available For Sale Securities [Line Items]
Fair value after 1 year through 5 years	2,510	2,491
Fair value	$ 2,510	$ 2,491

Fair Value of Assets and Liab47

Fair Value of Assets and Liabilities - Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets:
Borrower Loans	$ 310,034	$ 297,273
Loans Held for Sale	4,705	32
Available for Sale Investments, at Fair Value	55,713	73,187
Servicing Assets	14,297	14,363
Total Assets	384,749	384,855
Liabilities:
Notes	309,530	297,405
Servicing Liabilities	324	484
Contingent Consideration	4,929	4,801
Total Liabilities	314,783	302,690
Prosper Funding LLC [Member]
Assets:
Borrower Loans	310,034	297,273
Loans Held for Sale	4,705	32
Servicing Assets	13,798	13,605
Total Assets	328,537	310,910
Liabilities:
Notes	309,530	297,405
Servicing Liabilities	324	484
Total Liabilities	309,854	297,889
Level 2 Inputs [Member]
Assets:
Available for Sale Investments, at Fair Value	55,713	73,187
Total Assets	55,713	73,187
Level 3 Inputs [Member]
Assets:
Borrower Loans	310,034	297,273
Loans Held for Sale	4,705	32
Servicing Assets	14,297	14,363
Total Assets	329,036	311,668
Liabilities:
Notes	309,530	297,405
Servicing Liabilities	324	484
Contingent Consideration	4,929	4,801
Total Liabilities	314,783	302,690
Level 3 Inputs [Member] | Prosper Funding LLC [Member]
Assets:
Borrower Loans	310,034	297,273
Loans Held for Sale	4,705	32
Servicing Assets	13,798	13,605
Total Assets	328,537	310,910
Liabilities:
Notes	309,530	297,405
Servicing Liabilities	324	484
Total Liabilities	$ 309,854	$ 297,889

Fair Value of Assets and Liab48

Fair Value of Assets and Liabilities - Borrower Loans, Loans Held For Sale and Notes - Quantitative Information about the Significant Unobservable Inputs (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	4.40%	4.30%
Default rate	1.60%	1.40%
Minimum [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	4.40%	4.30%
Default rate	1.60%	1.40%
Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	15.00%	14.50%
Default rate	14.80%	14.40%
Maximum [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	15.00%	14.50%
Default rate	14.80%	14.40%

Fair Value of Assets and Liab49

Fair Value of Assets and Liabilities - Servicing Rights - Quantitative Information about the Significant Unobservable Inputs (Details)	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate	0.625%	0.625%
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate	0.625%	0.625%
Minimum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	15.00%	15.00%
Default rate	1.10%	1.20%
Prepayment rate	14.80%	14.30%
Minimum [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	15.00%	15.00%
Default rate	1.10%	1.20%
Prepayment rate	14.80%	14.30%
Maximum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	25.00%	25.00%
Default rate	15.00%	14.70%
Prepayment rate	27.60%	25.60%
Maximum [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	25.00%	25.00%
Default rate	15.00%	14.70%
Prepayment rate	27.60%	25.60%

Fair Value of Assets and Liab50

Fair Value of Assets and Liabilities - Summary of Level 3 Borrower Loans, Loans Held for Sale and Notes, Measured at Fair Value on a Recurring Basis (Details) - Recurring [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	$ 916	$ 1,202	$ (100)	$ 7,923
Purchase of Borrower Loans/Issuance of Notes, Total	426,762	861,600	1,358,079	1,402,436
Principal repayments, Total	(464)	(112)	607	(491)
Borrower Loans sold to third parties, Total	(421,810)	(861,574)	(1,353,259)	(1,408,883)
Other changes, Total	(193)	(208)	(39)	(3)
Change in fair value, Total	(2)	95	(79)	21
Ending balance, Total	5,209	1,003	5,209	1,003
Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	916	1,202	(100)	7,923
Purchase of Borrower Loans/Issuance of Notes, Total	426,762
Originations, Total		861,600	1,358,079	1,402,436
Principal repayments, Total	(464)	(112)	607	(491)
Borrower Loans sold to third parties, Total	(421,810)	(861,574)	(1,353,259)	(1,408,883)
Other changes, Total	(193)	(208)	(39)	(3)
Change in fair value, Total	(2)	95	(79)	21
Ending balance, Total	5,209		5,209
Prosper Funding LLC [Member] | Scenario Previously Reported [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Ending balance, Total		1,003		1,003
Notes [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	(302,357)	(280,801)	(297,405)	(273,783)
Purchase of Borrower Loans/Issuance of Notes, Liabilities	(53,873)	(46,779)	(109,147)	(94,575)
Principal repayments, Liabilities	41,057	37,440	83,119	73,509
Borrower Loans sold to third parties, Liabilities	499		1,081
Other changes, Liabilities	(191)	(71)	(33)	136
Change in fair value, Liabilities	5,335	5,583	12,855	10,085
Ending balance, Liabilities	(309,530)	(284,628)	(309,530)	(284,628)
Notes [Member] | Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	(302,357)	(280,801)	(297,405)	(273,783)
Purchase of Borrower Loans/Issuance of Notes, Liabilities	(53,873)
Originations, Liabilities		(46,779)	(109,147)	(94,575)
Principal repayments, Liabilities	41,057	37,440	83,119	73,509
Borrower Loans sold to third parties, Liabilities	499		1,081
Other changes, Liabilities	(191)	(71)	(33)	136
Change in fair value, Liabilities	5,335	5,583	12,855	10,085
Ending balance, Liabilities	(309,530)		(309,530)
Notes [Member] | Prosper Funding LLC [Member] | Scenario Previously Reported [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Ending balance, Liabilities		(284,628)		(284,628)
Borrower Loans [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	303,243	280,404	297,273	273,243
Purchase of Borrower Loans/Issuance of Notes, Assets	54,044	46,805	109,215	94,512
Principal repayments, Assets	(41,390)	(37,395)	(82,376)	(73,457)
Borrower Loans sold to third parties, Assets	(525)		(1,138)
Other changes, Assets	(2)	(136)	(6)	(130)
Change in fair value, Assets	(5,336)	(5,478)	(12,934)	(9,968)
Ending balance, Assets	310,034	284,200	310,034	284,200
Borrower Loans [Member] | Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	303,243	280,404	297,273	273,243
Purchase of Borrower Loans/Issuance of Notes, Assets	54,044
Originations, Assets		46,805	109,215	94,512
Principal repayments, Assets	(41,390)	(37,395)	(82,376)	(73,457)
Borrower Loans sold to third parties, Assets	(525)		(1,138)
Other changes, Assets	(2)	(136)	(6)	(130)
Change in fair value, Assets	(5,336)	(5,478)	(12,934)	(9,968)
Ending balance, Assets	310,034		310,034
Borrower Loans [Member] | Prosper Funding LLC [Member] | Scenario Previously Reported [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Ending balance, Assets		284,200		284,200
Loans Held for Sale [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	30	1,599	32	8,463
Purchase of Borrower Loans/Issuance of Notes, Assets	426,591	861,574	1,358,011	1,402,499
Principal repayments, Assets	(131)	(157)	(136)	(543)
Borrower Loans sold to third parties, Assets	(421,784)	(861,574)	(1,353,202)	(1,408,883)
Other changes, Assets		(1)		(9)
Change in fair value, Assets	(1)	(10)		(96)
Ending balance, Assets	4,705	1,431	4,705	1,431
Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	30	1,599	32	8,463
Purchase of Borrower Loans/Issuance of Notes, Assets	426,591
Originations, Assets		861,574	1,358,011	1,402,499
Principal repayments, Assets	(131)	(157)	(136)	(543)
Borrower Loans sold to third parties, Assets	(421,784)	(861,574)	(1,353,202)	(1,408,883)
Other changes, Assets		(1)		(9)
Change in fair value, Assets	(1)	(10)		(96)
Ending balance, Assets	$ 4,705		$ 4,705
Loans Held for Sale [Member] | Prosper Funding LLC [Member] | Scenario Previously Reported [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Ending balance, Assets		$ 1,431		$ 1,431

Fair Value of Assets and Liab51

Fair Value of Assets and Liabilities - Schedule of Servicing Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period			$ 14,363
Prosper Funding LLC [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period			13,605
Servicing assets [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period				$ 4,163
Adjustment to Adopt Fair Value Measurement, servicing assets				546
Fair value at beginning of period	$ 15,548	$ 6,034	14,363	4,709
Additions	1,729	3,759	5,750	5,837
Less: Changes in fair value	(2,980)	(1,111)	(5,816)	(1,864)
Fair Value at end of period	14,297	8,682	14,297	8,682
Servicing assets [Member] | Prosper Funding LLC [Member]
Servicing Asset at Amortized Cost, Balance [Roll Forward]
Amortized cost at beginning of period				3,116
Adjustment to Adopt Fair Value Measurement, servicing assets				399
Fair value at beginning of period	14,929	4,782	13,605	3,515
Additions	1,729	3,759	5,750	5,837
Less: Transfers to PMI				(249)
Less: Changes in fair value	(2,860)	(907)	(5,557)	(1,469)
Fair Value at end of period	13,798	7,634	13,798	7,634
Servicing liabilities [Member]
Servicing Liability at Amortized Cost [Roll Forward]
Amortized cost at beginning of period				624
Adjustment to Adopt Fair Value Measurement				(29)
Fair value at beginning of the period	398	668	484	595
Additions		39	9	193
Less: Changes in fair value	(74)	(101)	(169)	(182)
Fair value at end of the period	324	606	324	606
Servicing liabilities [Member] | Prosper Funding LLC [Member]
Servicing Liability at Amortized Cost [Roll Forward]
Amortized cost at beginning of period				624
Adjustment to Adopt Fair Value Measurement				(29)
Fair value at beginning of the period	398	668	484	595
Additions		39	9	193
Less: Changes in fair value	(74)	(101)	(169)	(182)
Fair value at end of the period	$ 324	$ 606	$ 324	$ 606

Fair Value of Assets and Liab52

Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Oct. 09, 2015	Jun. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent Consideration		$ 4,929	$ 4,929	$ 4,801
Changes in fair value		$ 63,000	$ 128,000
BillGuard Inc [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Business Acquisition, Effective Date of Acquisition			Oct. 9, 2015
Outstanding shares purchased by parent company	100.00%
Business Acquisition, Name of Acquired Entity			BillGuard, Inc
Duration of payment for purchase of outstanding shares	1 year

Fair Value of Assets and Liab53

Fair Value of Assets and Liabilities - Fair Value Assumptions for Borrower Loans, Loans Held for Sale and Notes (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016USD ($)
Discount rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	7.25%
Discount rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	7.25%
Discount rate assumption [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	7.25%
Discount rate assumption [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	7.25%
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	$ 306,868
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	306,868
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	306,363
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	306,363
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	303,781
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	303,781
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	303,277
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	303,277
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	313,283
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	313,283
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	312,780
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	312,780
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	316,619
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	316,619
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	316,116
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	$ 316,116
Default rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	11.02%
Default rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	11.02%
Default rate assumption [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	11.02%
Default rate assumption [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	11.02%
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	$ 306,882
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	306,882
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	306,370
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	306,370
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	303,823
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	303,823
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	303,303
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	303,303
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	313,200
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	313,200
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	312,704
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	312,704
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	316,399
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Borrower Loans and Loans Held for Sale [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Borrower loans	316,399
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	315,913
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	$ 315,913

Fair Value of Assets and Liab54

Fair Value of Assets and Liabilities - Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate assumptions	0.625%	0.625%
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate assumptions	0.625%	0.625%
Servicing assets [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate assumptions	0.625%
Resulting fair value from:
Market servicing rate increase to 0.65%	$ 13,252
Market servicing rate decrease to 0.60%	$ 15,342
Weighted average prepayment assumptions	20.44%
Weighted average default assumptions	11.39%
Servicing assets [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Market servicing rate assumptions	0.625%
Resulting fair value from:
Market servicing rate increase to 0.65%	$ 12,952
Market servicing rate decrease to 0.60%	$ 14,995
Weighted average prepayment assumptions	20.44%
Weighted average default assumptions	11.39%
Servicing liabilities [Member]
Resulting fair value from:
Weighted average prepayment assumptions	20.44%
Market servicing rate increase to 0.65%	$ 356
Market servicing rate decrease to 0.60%	$ 291
Weighted average default assumptions	11.39%
Market servicing rate assumptions	0.625%
Servicing liabilities [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Weighted average prepayment assumptions	20.44%
Market servicing rate increase to 0.65%	$ 356
Market servicing rate decrease to 0.60%	$ 291
Weighted average default assumptions	11.39%
Market servicing rate assumptions	0.625%
Prepayment rate assumption [Member] | Servicing assets [Member] | 1.1 Multiplier to Prepayment Rate [Member]
Resulting fair value from:
Applying a 1.1 multiplier to prepayment rate	$ 13,918
Prepayment rate assumption [Member] | Servicing assets [Member] | 0.9 Multiplier Prepayment Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to prepayment rate	14,451
Prepayment rate assumption [Member] | Servicing assets [Member] | 1.1 Multiplier to Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Market servicing rate increase to 0.65%	13,541
Prepayment rate assumption [Member] | Servicing assets [Member] | 0.9 Multiplier Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Market servicing rate decrease to 0.60%	14,059
Prepayment rate assumption [Member] | Servicing liabilities [Member] | 1.1 Multiplier to Prepayment Rate [Member]
Resulting fair value from:
Applying a 1.1 multiplier to prepayment rate	303
Prepayment rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Prepayment Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to prepayment rate	314
Prepayment rate assumption [Member] | Servicing liabilities [Member] | 1.1 Multiplier to Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	303
Prepayment rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	314
Default rate assumption [Member] | Servicing assets [Member] | 1.1 Multiplier to Default Rate [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	14,067
Default rate assumption [Member] | Servicing assets [Member] | 1.1 Multiplier to Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	13,576
Default rate assumption [Member] | Servicing assets [Member] | 0.9 Multiplier Default Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	14,530
Default rate assumption [Member] | Servicing assets [Member] | 0.9 Multiplier Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	14,023
Default rate assumption [Member] | Servicing liabilities [Member] | 1.1 Multiplier to Default Rate [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	323
Default rate assumption [Member] | Servicing liabilities [Member] | 1.1 Multiplier to Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	323
Default rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Default Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	323
Default rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	$ 323

Fair Value of Assets and Liab55

Fair Value of Assets and Liabilities - Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities (Parenthetical) (Details)	6 Months Ended
	Jun. 30, 2016
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing rate increase	0.65%
Servicing rate decrease	0.60%
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Servicing rate increase	0.65%
Servicing rate decrease	0.60%
Prepayment rate assumption [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Prepayment rate increase	1.10%
Prepayment rate decrease	0.90%
Prepayment rate assumption [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Prepayment rate increase	1.10%
Prepayment rate decrease	0.90%
Default rate assumption [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Default rate increase	1.10%
Default rate decrease	0.90%
Default rate assumption [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Default rate increase	1.10%
Default rate decrease	0.90%

Acquisitions - Additional Infor

Acquisitions - Additional Information (Details)	6 Months Ended
	Jun. 30, 2016
American HealthCare Lending [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Jan. 23, 2015
Business Acquisition, Name of Acquired Entity	American HealthCare Lending
BillGuard Inc [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Oct. 9, 2015
Business Acquisition, Name of Acquired Entity	BillGuard, Inc

Goodwill And Other Intangible57

Goodwill And Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 36,368,000		$ 36,368,000		$ 36,368,000
Goodwill impairment expense			0
Intangible assets	11,076,000		11,076,000		$ 13,051,000
Amortization of intangible assets	1,000,000	$ 300,000	$ 2,000,000	$ 300,000
User Base and Customer Relationships [Member] | Minimum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized period			3 years
User Base and Customer Relationships [Member] | Maximum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized period			10 years
Developed Technology [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets	$ 6,802,000		$ 6,802,000
Intangible assets amortized period			4 years 3 months 18 days
Developed Technology [Member] | Minimum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized period			3 years
Developed Technology [Member] | Maximum [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized period			5 years
Brand Name [Member]
Goodwill And Other Intangible Assets [Line Items]
Intangible assets amortized period			1 year

Goodwill And Other Intangible58

Goodwill And Other Intangible Assets - Summary of Other Intangible for the Period Presented (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 14,620
Accumulated Amortization	(3,544)
Net Carrying Value	11,076	$ 13,051
User Base and Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	6,250
Accumulated Amortization	(1,976)
Net Carrying Value	$ 4,274
Remaining Useful Life (In Years)	8 years 7 months 6 days
Developed Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 8,310
Accumulated Amortization	(1,508)
Net Carrying Value	$ 6,802
Remaining Useful Life (In Years)	4 years 3 months 18 days
Brand Name [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 60
Accumulated Amortization	$ (60)
Remaining Useful Life (In Years)	1 year
Remaining Useful Life (In Years)	0 years

Goodwill And Other Intangible59

Goodwill And Other Intangible Assets - Summary of Estimated Amortization of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]
2,016	$ 1,862
2,017	3,260
2,018	2,329
2,019	1,779
2,020	1,344
Thereafter	502
Net Carrying Value	$ 11,076	$ 13,051

Other Liabilities - Schedule of

Other Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Other Liabilities [Abstract]
Class action settlement liability	$ 2,973	$ 5,949
Repurchase liability for unvested restricted stock awards	267	473
Contingent consideration	4,929	4,801
Deferred revenue	420	1,591
Servicing liabilities	324	484
Deferred rent	4,647	5,240
Restructuring liability	8,492
Other	2,364	2,197
Total Other Liabilities	$ 24,416	$ 20,735

Net Loss Per Share - Basic and

Net Loss Per Share - Basic and Diluted Net Loss Per Share (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Numerator [Abstract]
Net loss available to common stockholders for basic and diluted EPS	$ (35,628)	$ (6,201)	$ (53,092)	$ (13,477)
Denominator [Abstract]
Weighted average shares used in computing basic and diluted net loss per share	63,270,058	55,612,485	61,813,773	54,168,175
Basic and diluted net loss per share	$ (0.56)	$ (0.11)	$ (0.86)	$ (0.25)

Net Loss Per Share - Common Sto

Net Loss Per Share - Common Stock Equivalents Excluded from Computation of Diluted Net Loss Per Share (Details) - shares	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
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)	227,416,092	45,668,076	225,221,095	45,164,178
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)	177,388,425	35,477,685	177,388,425	35,477,685
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)	43,719,604	6,982,320	41,694,271	6,478,422
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)	5,345,950	3,084,604	5,345,950	3,084,604
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)	962,113	123,467	792,449	123,467

Net Loss Per Share - Additional

Net Loss Per Share - Additional Information (Details)	Feb. 16, 2016shares
Earnings Per Share [Abstract]
Forward stock split, shares issued (in shares)	5
Forward stock split, shares converted (in shares)	1

Convertible Preferred Stock a64

Convertible Preferred Stock and Stockholders' Deficit - Summary of Shares Authorized, Issued, Outstanding, Par Value and Liquidation Preference of Convertible Preferred Stock (Details) - USD ($) $ / shares in Units, $ in Thousands	Jun. 30, 2016	May 31, 2016	Dec. 31, 2015
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01		$ 0.01
Convertible preferred stock, shares authorized (in shares)	177,388,425	177,388,425	177,388,425
Convertible preferred stock, shares outstanding (in shares)	177,388,425		177,388,425
Convertible preferred stock, shares issued (in shares)	177,388,425		177,388,425
Convertible preferred stock, aggregate liquidation preference	$ 325,952		$ 325,952
Series A Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, shares authorized (in shares)	68,558,220
Convertible preferred stock, shares outstanding (in shares)	68,558,220
Convertible preferred stock, shares issued (in shares)	68,558,220
Convertible preferred stock, aggregate liquidation preference	$ 19,774
Series A 1 [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, shares authorized (in shares)	24,760,915
Convertible preferred stock, shares outstanding (in shares)	24,760,915
Convertible preferred stock, shares issued (in shares)	24,760,915
Convertible preferred stock, aggregate liquidation preference	$ 49,522
Series B Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, shares authorized (in shares)	35,775,880
Convertible preferred stock, shares outstanding (in shares)	35,775,880
Convertible preferred stock, shares issued (in shares)	35,775,880
Convertible preferred stock, aggregate liquidation preference	$ 21,581
Series C Convertible Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, shares authorized (in shares)	24,404,770
Convertible preferred stock, shares outstanding (in shares)	24,404,770
Convertible preferred stock, shares issued (in shares)	24,404,770
Convertible preferred stock, aggregate liquidation preference	$ 70,075
Series D Preferred Stock [Member]
Class of Stock [Line Items]
Convertible preferred stock, par value (in dollars per share)	$ 0.01
Convertible preferred stock, shares authorized (in shares)	23,888,640
Convertible preferred stock, shares outstanding (in shares)	23,888,640
Convertible preferred stock, shares issued (in shares)	23,888,640
Convertible preferred stock, aggregate liquidation preference	$ 165,000

Convertible Preferred Stock a65

Convertible Preferred Stock and Stockholders' Deficit - Additional Information (Details) $ / shares in Units, $ in Thousands	Feb. 16, 2016	Jun. 30, 2016USD ($)$ / sharesshares	May 31, 2016$ / sharesshares	Dec. 31, 2015$ / sharesshares
Class of Stock [Line Items]
Stock split conversion ratio	0.2	5
Common and preferred stock, shares authorized (in shares)			475,610,528
Common stock, shares authorized (in shares)		298,222,103	298,222,103	270,326,075
Preferred stock, shares authorized (in shares)		177,388,425	177,388,425	177,388,425
Common stock, par value (in dollars per share) | $ / shares		$ 0.01	$ 0.01	$ 0.01
Preferred stock, par value (in dollars per share) | $ / shares			$ 0.01
Common stock, shares issued (in shares)		70,893,225		70,367,425
Common stock, shares outstanding (in shares)		69,957,290		69,431,490
Common stock voting rights		Each holder of common stock is entitled to one vote for each share of common stock held.
Common Stock [Member]
Class of Stock [Line Items]
Stock split conversion ratio	5
Exercise of stock options (in shares)		334,475
Proceeds from Exercise of Vested Stock Options | $		$ 300
Unvested restricted stock outstanding (in shares)		5,345,950		9,806,170
Stock repurchase upon termination of employment (in shares)		51,105
Aggregate price for repurchase of common stock | $		$ 46
Warrants [Member]
Class of Stock [Line Items]
Shares issued (in shares)		51,915
Exercise of warrants aggregate proceeds | $		$ 11

Shared Based Incentive Plan a66

Shared Based Incentive Plan and Compensation - Additional Information (Details)	Feb. 16, 2016	Jun. 30, 2016USD ($)shares	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)shares	Jun. 30, 2015USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights				Options generally vest 25% one year from the vesting commencement date and 1/48th per month thereafter or vest 50% two years from the vesting commencement date and 1/48 th per month thereafter or vest 1/36th per month from the vesting commencement date.
Options exercisable, maximum period				10 years
Stock split conversion ratio	0.2			5
Stock split conversion ratio description				The number of options, restricted stock units and amounts per share reflects a 5-for-1 forward stock split effected by PMI on February 16, 2016.
Stock-Based Compensation Expense				$ 11,510,000	$ 4,192,000
Unamortized expense related to unvested stock-based awards		$ 58,600,000		58,600,000
Unrecognized cost of unvested share-based compensation awards.		0		$ 0
Remaining weighted average vesting period				2 years 9 months 7 days
Internal-use Software and Website Development Costs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation, capitalized amount		225,000	$ 175,000	$ 436,000	$ 297,000
Stock Options Issued and Outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense		700,000	$ 100,000
Stock Option Repricing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation Expense		1,200,000
Unamortized expense related to unvested stock-based awards		$ 4,200,000		$ 4,200,000
Weighted average vesting period				2 years 9 months 18 days
Restricted Stock Unit (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value				$ 10,700,000
Vesting Period One [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the options				1 year
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				25.00%
Vesting Period Two [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Vesting period of the options				2 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Percentage				50.00%
2005 Stock Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options made available in pool (in shares) | shares		59,388,480		59,388,480
2005 Stock Plan [Member] | Stock Options Issued and Outstanding [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Shares available for grant under the plan | shares		0		0
2015 Stock Option Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of options made available in pool (in shares) | shares		51,850,918		51,850,918
Shares available for grant under the plan | shares		11,402,606		11,402,606

Shared Based Incentive Plan a67

Shared Based Incentive Plan and Compensation - Schedule of Activity of Options that were Early Exercised under the Plan (Details) - Early Exercised Stock Options Under 2005 Stock Option Plan [Member]	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Early exercised options, unvested [Roll Forward]
Beginning balance | shares	9,806,170
Repurchase of restricted stock | shares	(51,105)
Restricted stock vested | shares	(4,409,115)
Ending balance | shares	5,345,950
Weighted average exercise price [Abstract]
Weighted-Average Exercise Price, Beginning balance | $ / shares	$ 0.05
Repurchase of restricted stock | $ / shares	0.90
Restricted stock vested | $ / shares	0.04
Weighted-Average Exercise Price, Ending balance | $ / shares	$ 0.05

Shared Based Incentive Plan a68

Shared Based Incentive Plan and Compensation - Additional Information Regarding Unvested Early exercised stock options outstanding (Details)	6 Months Ended
	Jun. 30, 2016$ / sharesshares
$0.02 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices	$ 0.02
Number Outstanding | shares	4,847,590
Weighted Avg. Remaining Life	8 months 12 days
Weighted Avg. Exercise Price	$ 0.02
$0.11 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices	$ 0.11
Number Outstanding | shares	387,010
Weighted Avg. Remaining Life	1 year 7 months 6 days
Weighted Avg. Exercise Price	$ 0.11
$1.13 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices	$ 1.13
Number Outstanding | shares	111,350
Weighted Avg. Remaining Life	2 years 1 month 6 days
Weighted Avg. Exercise Price	$ 1.13
$0.02 - $1.13 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	0.02
Range of Exercise Prices, Maximum	$ 1.13
Number Outstanding | shares	5,345,950
Weighted Avg. Remaining Life	9 months 18 days
Weighted Avg. Exercise Price	$ 0.05

Shared Based Incentive Plan a69

Shared Based Incentive Plan and Compensation - Summarized Option Activity under Option Plan (Details) - 2005 Stock Plan and 2015 Stock Option Plan [Member]	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Options Issued and Outstanding [Roll Forward]
Options Issued and Outstanding, Beginning Balance | shares	40,425,605
Options Issued and Outstanding, Options issued | shares	19,655,338
Options Issued and Outstanding, Options exercised - vested | shares	(334,475)
Options Issued and Outstanding, Options forfeited | shares	(4,725,406)
Options Issued and Outstanding, Ending balance | shares	55,021,062
Options Issued and Outstanding, Options vested and/or exercisable at March 31, 2016 | shares	26,856,397
Weighted-Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Beginning balance | $ / shares	$ 2.64
Weighted-Average Exercise Price, Options issued | $ / shares	2.14
Weighted-Average Exercise Price, Options exercised - vested | $ / shares	0.85
Weighted-Average Exercise Price, Options forfeited | $ / shares	1.38
Weighted-Average Exercise Price, Ending balance | $ / shares	1.54
Weighted-Average Exercise Price, Options vested and/or exercisable at March 31, 2016 | $ / shares	$ 1.15

Shared Based Incentive Plan a70

Shared Based Incentive Plan and Compensation - Additional Information Regarding Common Stock Options Outstanding (Details) - Stock Options Issued and Outstanding [Member]	6 Months Ended
	Jun. 30, 2016$ / sharesshares
$0.02 - 0.99 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	$ 0.02
Range of Exercise Prices, Maximum	$ 0.99
Number Outstanding | shares	13,462,825
Weighted Avg. Remaining Life	7 years 4 months 28 days
Weighted Avg. Exercise Price	$ 0.12
Number Exercisable | shares	13,462,110
Weighted-Avg. Exercise Price	$ 0.12
$1.00 -2.99 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	1
Range of Exercise Prices, Maximum	$ 2.99
Number Outstanding | shares	38,325,717
Weighted Avg. Remaining Life	9 years 4 months 2 days
Weighted Avg. Exercise Price	$ 2.04
Number Exercisable | shares	11,565,657
Weighted-Avg. Exercise Price	$ 1.91
$3.00 - 4.99 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	3
Range of Exercise Prices, Maximum	$ 4.99
Number Outstanding | shares	1,586,875
Weighted Avg. Remaining Life	8 years 7 months 17 days
Weighted Avg. Exercise Price	$ 3.62
Number Exercisable | shares	1,586,875
Weighted-Avg. Exercise Price	$ 3.62
$5.00- 5.52 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	5
Range of Exercise Prices, Maximum	$ 5.52
Number Outstanding | shares	1,645,645
Weighted Avg. Remaining Life	9 years 1 month 21 days
Weighted Avg. Exercise Price	$ 5.49
Number Exercisable | shares	241,755
Weighted-Avg. Exercise Price	$ 5.46
$0.02 - 5.52 [Member]
Share Based Compensation Shares Authorized Under Stock Option Plans Exercise Price Range [Line Items]
Range of Exercise Prices, Minimum	0.02
Range of Exercise Prices, Maximum	$ 5.52
Number Outstanding | shares	55,021,062
Weighted Avg. Remaining Life	8 years 10 months 2 days
Weighted Avg. Exercise Price	$ 1.72
Number Exercisable | shares	26,856,397
Weighted-Avg. Exercise Price	$ 1.15

Shared Based Incentive Plan a71

Shared Based Incentive Plan and Compensation - Fair Value of Stock Option Awards (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Fair value of stock option awards [Abstract]
Volatility of common stock	50.88%	52.75%	50.88%	57.26%
Risk-free interest rate	1.29%	1.80%	1.29%	1.72%
Expected life	5 years 9 months 18 days	6 years	5 years 9 months 18 days	6 years 1 month 6 days
Dividend yield	0.00%	0.00%	0.00%	0.00%

Shared Based Incentive Plan a72

Shared Based Incentive Plan and Compensation - Summarized Activities for the Company's RSU's (Details) - Restricted Stock Unit (RSUs) [Member]	6 Months Ended
	Jun. 30, 2016$ / sharesshares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Restricted stock unit ,Unvested ,Beginning Balance | shares	1,835,510
Granted | shares	3,580,220
Forfeited | shares	(1,274,920)
Restricted stock unit ,Unvested ,Ending Balance | shares	4,140,810
Unvested | $ / shares	$ 5.52
Granted | $ / shares	2.14
Forfeited | $ / shares	2.14
Unvested | $ / shares	$ 2.59

Shared Based Incentive Plan a73

Shared Based Incentive Plan and Compensation - Stock Based Compensation Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$ 6,404	$ 2,752	$ 11,510	$ 4,192
Origination and Servicing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	579	292	1,018	436
Sales and Marketing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	896	676	1,632	1,065
General and Administrative [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	4,884	$ 1,784	8,815	$ 2,691
Restructuring [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$ 45		$ 45

Restructuring - Additional Info

Restructuring - Additional Information (Details) $ in Millions	3 Months Ended	6 Months Ended
	Jun. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Sep. 30, 2016USD ($)	May 03, 2016Employee
Restructuring Cost And Reserve [Line Items]
Number of employees terminated due to restructuring | Employee				167
Employee severance and benefits charges	$ 5.4
San Francisco, Salt Lake City and Phoenix [Member]
Restructuring Cost And Reserve [Line Items]
Loss incurred on leases		$ 8.7
Scenario, Forecast [Member]
Restructuring Cost And Reserve [Line Items]
Expected employee severance and benefits charges			$ 0.2
Scenario, Forecast [Member] | Facilities Related [Member]
Restructuring Cost And Reserve [Line Items]
Expected employee severance and benefits charges			$ 0.2

Restructuring - Summary of Acti

Restructuring - Summary of Activities Related to Prosper's Restructuring Plan (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2016
Restructuring Cost And Reserve [Line Items]
Additions to expense	$ 14,061	$ 14,061
Transfer from deferred rent	764
Less: Cash paid	(4,295)
Ending Balance	10,530	10,530
Severance Related [Member]
Restructuring Cost And Reserve [Line Items]
Additions to expense	5,400
Less: Cash paid	(3,362)
Ending Balance	2,038	2,038
Facilities Related [Member]
Restructuring Cost And Reserve [Line Items]
Additions to expense	8,661
Transfer from deferred rent	764
Less: Cash paid	(933)
Ending Balance	$ 8,492	$ 8,492

Restructuring - Summary of Ac76

Restructuring - Summary of Activities Related to Prosper's Restructuring Plan (Parenthetical) (Details) $ in Thousands	3 Months Ended
	Jun. 30, 2016USD ($)
Restructuring And Related Activities [Abstract]
Non-cash charges	$ 45

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Income Taxes [Line Items]
Income Tax Expense	$ 105,000	$ 176,000	$ 270,000	$ 249,000
Prosper Funding LLC [Member]
Income Taxes [Line Items]
Income Tax Expense			$ 0	$ 0
Net effective tax rate			0.00%	0.00%
Valuation ​Allowance of Deferred ​Tax ​Assets
Income Taxes [Line Items]
Income Tax Expense			$ 0	$ 0

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Details)	3 Months Ended				6 Months Ended		12 Months Ended
	Sep. 30, 2016USD ($)	Jun. 30, 2016USD ($)	Mar. 31, 2016Installment	Jun. 30, 2015USD ($)	Jun. 30, 2016USD ($)Installment	Jun. 30, 2015USD ($)	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Oct. 16, 2008USD ($)
Commitments And Contingencies [Line Items]
Rental expense under operating lease arrangements		$ 1,900,000		$ 900,000	$ 3,700,000	$ 1,700,000
Minimum fee, Remaining six months of 2016		800,000			800,000
Minimum fee, 2017		1,700,000			1,700,000
Minimum fee, 2018		1,700,000			1,700,000
Minimum fee, 2019		1,000,000			1,000,000
Maximum potential future payments		4,063,000,000			4,063,000,000
Accrued repurchase and indemnification obligation		489,000			489,000		$ 510,000
Amount of loans sold to lender members									$ 178,000,000
Agreed amount of settlement liability payable to plaintiffs					$ 10,000,000
Number of annual installments paid to plaintiffs | Installment			3		4
Other commitment paid							2,000,000	$ 2,000,000
Settlement installment due in 2016		3,000,000			$ 3,000,000
Settlement installment due in 2017		3,000,000			3,000,000
Class action settlement liability		2,973,000			2,973,000		5,949,000
Prosper Funding LLC [Member]
Commitments And Contingencies [Line Items]
Minimum fee, Remaining six months of 2016		800,000			800,000
Minimum fee, 2017		1,700,000			1,700,000
Minimum fee, 2018		1,700,000			1,700,000
Minimum fee, 2019		1,000,000			1,000,000
Maximum potential future payments		3,911,000,000			3,911,000,000
Accrued repurchase and indemnification obligation		$ 439,000			$ 439,000		$ 460,000
Scenario, Forecast [Member]
Commitments And Contingencies [Line Items]
Purchase of borrower loans	$ 7,800,000
Scenario, Forecast [Member] | Prosper Funding LLC [Member]
Commitments And Contingencies [Line Items]
Purchase of borrower loans	$ 7,800,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Non cancelable operating lease expiration					2,022
Maximum [Member]
Commitments And Contingencies [Line Items]
Non cancelable operating lease expiration					2,027

Commitments and Contingencies79

Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Jun. 30, 2016USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
Remaining six months of 2016	$ 3,674
2,017	8,888
2,018	9,524
2,019	9,732
2,020	10,225
2,021	10,313
Thereafter	26,102
Total future operating lease obligations	$ 78,458

Related Parties - Additional In

Related Parties - Additional Information (Details)	6 Months Ended
	Jun. 30, 2016
Related Party Transactions [Abstract]
Minimum percentage of voting securities considered for related parties	10.00%
Minimum percentage of stock holders considered for related parties	10.00%

Related Parties - Aggregate Amo

Related Parties - Aggregate Amount of Notes Purchased and the Income Earned (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	$ 510	$ 365	$ 1,151	$ 866
Interest earned on Notes and Borrower Loans	70	53	125	102
Notes and Borrower Loans balance	2,350		2,350		$ 2,237
Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	396	365	801	846
Interest earned on Notes and Borrower Loans	61	51	110	98
Notes and Borrower Loans balance	1,822		1,822		1,912
Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	396	365	801	846
Interest earned on Notes and Borrower Loans	61	51	110	98
Notes and Borrower Loans balance	1,822		1,822		1,912
Executive Officers & Management [Member] | Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	396	365	801	846
Interest earned on Notes and Borrower Loans	61	51	110	98
Notes and Borrower Loans balance	1,822		1,822		1,912
Directors (Excluding Executive Officers and Management) [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes and borrower loans purchased	114		350	20
Interest earned on Notes and Borrower Loans	9	$ 2	15	$ 4
Notes and Borrower Loans balance	$ 528		$ 528		$ 325

Subsequent Events (Details)

Subsequent Events (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Aug. 01, 2016	Dec. 31, 2015
Subsequent Event [Line Items]
Initial origination and sale agreement period	3 years
Additional collateral account deposit	$ 133,216		$ 151,223
Subsequent Event [Member]
Subsequent Event [Line Items]
Additional collateral account deposit		$ 5,000
Minimum liquidity covenant		$ 15,000

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Prosper Funding LLC [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Comprehensive income (loss)	$ 0	$ 0