Prosper Funding 10-Q 12 May 16 2016 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2016	May. 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		69,716,310
Document Fiscal Year Focus	2,016
Document Fiscal Period Focus	Q1
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 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	Mar. 31, 2016	Dec. 31, 2015
Assets
Cash and Cash Equivalents	$ 40,961	$ 66,295
Restricted Cash	148,091	151,223
Available for Sale Investments, at Fair Value	67,958	73,187
Accounts Receivable	2,652	2,434
Loans Held for Sale, at Fair Value	30	32
Borrower Loans, at Fair Value	303,243	297,273
Property and Equipment, Net	28,143	24,965
Prepaid and Other Assets	7,109	6,433
Servicing Assets	15,548	14,363
Goodwill	36,368	36,368
Intangibles Assets, Net	12,083	13,051
Total Assets	662,186	685,624
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Accounts Payable and Accrued Liabilities	13,987	22,409
Payable to Investors	132,625	136,507
Notes at Fair Value	302,357	297,405
Other Liabilities	16,274	20,735
Total Liabilities	$ 465,243	$ 477,056
Commitments and Contingencies (see Note 15)
Convertible Preferred Stock – $0.01 par value; 177,388,425 shares authorized, issued and outstanding as of March 31, 2016 and December 31, 2015. Aggregate liquidation preference of $325,952 as of March 31, 2016 and December 31, 2015.	$ 275,938	$ 275,938
Stockholders' Deficit
Common Stock ($0.01 par value; 286,826,075 shares authorized; 70,629,640 issued and 69,693,705 outstanding as of March 31, 2016; and 270,326,075 shares authorized; 70,367,425 shares issued and 69,431,490 outstanding as of December 31, 2015)	150	127
Additional Paid-In Capital	108,593	102,971
Less: Treasury Stock (5,177,235 common shares at cost, March 31, 2016 and December 31, 2015)	(23,417)	(23,417)
Accumulated Deficit	(164,368)	(146,907)
Accumulated Other Comprehensive Income/(Loss)	47	(144)
Total Stockholders' Deficit	(78,995)	(67,370)
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit	662,186	685,624
Prosper Funding LLC [Member]
Assets
Cash and Cash Equivalents	16,901	15,026
Restricted Cash	136,876	139,937
Short Term Investments	1,278	1,277
Loans Held for Sale, at Fair Value	30	32
Borrower Loans, at Fair Value	303,243	297,273
Property and Equipment, Net	8,399	8,419
Servicing Assets	14,929	13,605
Other assets	509	122
Total Assets	482,165	475,691
Liabilities, Convertible Preferred Stock and Stockholders' Deficit
Accounts Payable and Accrued Liabilities	1,516	2,122
Payable to Related Party	4,159	2,989
Payable to Investors	131,436	135,661
Notes at Fair Value	302,357	297,405
Other Liabilities	1,246	1,209
Total Liabilities	440,714	439,386
Stockholders' Deficit
Accumulated Deficit	41,451	36,305
Total Stockholders' Deficit	41,451	36,305
Total Liabilities, Convertible Preferred Stock and Stockholders' Deficit	$ 482,165	$ 475,691

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 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)	286,826,075	270,326,075
Common stock, shares issued (in shares)	70,629,640	70,367,425
Common stock, shares outstanding (in shares)	69,693,705	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
	Mar. 31, 2016	Mar. 31, 2015
Operating Revenues
Transaction Fees, Net	$ 41,824,000	$ 25,342,000
Servicing Fees, Net	7,144,000	2,569,000
Gain on Sale of Borrower Loans	3,791,000	1,922,000
Other Revenue	2,773,000	1,076,000
Total Operating Revenues	55,532,000	30,909,000
Interest Income
Interest Income on Borrower Loans	10,783,000	10,476,000
Interest Expense on Notes	(9,722,000)	(9,563,000)
Net Interest Income	1,061,000	913,000
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	(78,000)	(101,000)
Total Net Revenue	56,515,000	31,721,000
Expenses
Origination and Servicing	10,449,000	6,852,000
Sales and Marketing	32,720,000	18,570,000
General and Administrative	30,645,000	13,502,000
Total Expenses	73,814,000	38,924,000
Net Loss Before Taxes	(17,299,000)	(7,203,000)
Income Tax Expense	165,000	73,000
Total Net Income	(17,464,000)	(7,276,000)
Net Loss Applicable to Common Stockholders	$ (17,464,000)	$ (7,276,000)
Net Loss Per Share – Basic and Diluted	$ (0.29)	$ (0.14)
Weighted-Average Shares - Basic and Diluted	60,357,488	52,766,255
Prosper Funding LLC [Member]
Operating Revenues
Administration Fee Revenue - Related Party	$ 15,417,000	$ 9,673,000
Servicing Fees, Net	7,034,000	2,265,000
Gain on Sale of Borrower Loans	3,791,000	1,922,000
Other Revenue	392,000
Total Operating Revenues	26,634,000	13,860,000
Interest Income
Interest Income on Borrower Loans	10,507,000	10,522,000
Interest Expense on Notes	(9,722,000)	(9,563,000)
Net Interest Income	785,000	959,000
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes, Net	(78,000)	(101,000)
Total Net Revenue	27,341,000	14,718,000
Expenses
Administration Fee - Related Party	20,607,000	9,295,000
Servicing	1,227,000	1,373,000
General and Administrative	357,000	266,000
Total Expenses	22,191,000	10,934,000
Income Tax Expense	0	0
Total Net Income	$ 5,150,000	$ 3,784,000

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Other Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement Of Income And Comprehensive Income [Abstract]
Net Loss	$ (17,464)	$ (7,276)
Other Comprehensive Income (Loss), Before Tax
Change in Net Unrealized Gain (Loss) on Available for Sale Investments, at Fair Value	191
Other Comprehensive Income (Loss), Before Tax	191
Other Comprehensive Income (Loss), Net of Tax	191
Comprehensive Income (Loss)	$ (17,273)	$ (7,276)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Cash flows from Operating Activities:
Net Income (Loss)	$ (17,464)	$ (7,276)
Adjustments to Reconcile Net Income (Loss) to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes	78	101
Depreciation And Amortization	2,971	1,850
Gain on Sale of Borrower Loans	(3,971)	(1,928)
Change in Fair Value of Servicing Rights	2,741	675
Stock-Based Compensation Expense	5,107	1,439
Other, Net	(30)	(186)
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(931,420)	(540,924)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	931,422	547,673
Restricted Cash Except for those Related to Investing Activities	2,118	(19,922)
Accounts Receivable	(218)	2,031
Prepaid and Other Assets	(677)	(853)
Accounts Payable and Accrued Liabilities	(7,414)	926
Payable to Investors	(3,882)	23,212
Other Liabilities	(4,305)	(722)
Net Cash Provided by (Used in) Operating Activities	(24,944)	6,096
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(55,171)	(47,714)
Principal Payments of Borrower Loans Held at Fair Value	41,599	36,063
Purchases of Property and Equipment	(5,976)	(3,537)
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)
Maturities of Available for Sale Investments	17,034
Acquisition of Businesses, Net of Cash Acquired		(19,000)
Changes in Restricted Cash Related to Investing Activities	1,014	1,859
Net Cash Used in Investing Activities	(13,224)	(32,330)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	55,273	47,796
Payments of Notes Held at Fair Value	(42,644)	(36,069)
Proceeds from Exercise of Warrants and Stock Options including Early Exercise, and Issuance of Restricted Stock	251	2,283
Repurchase of Common Stock and Restricted Stock	(46)	(1)
Net Cash Provided by (Used in) Financing Activities	12,834	14,009
Net Increase (Decrease) in Cash and Cash Equivalents	(25,334)	(12,225)
Cash and Cash Equivalents at Beginning of the Period	66,295	50,557
Cash and Cash Equivalents at End of the Period	40,961	38,332
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	9,879	10,444
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	478	321
Non-Cash Investing Activity- Amount Payable for the Acquisition of Business		840
Prosper Funding LLC [Member]
Cash flows from Operating Activities:
Net Income (Loss)	5,150	3,784
Adjustments to Reconcile Net Income (Loss) to Net Cash Used in Operating Activities:
Change in Fair Value of Borrower Loans, Loans Held for Sale and Notes	78	101
Other Non-Cash Changes in Borrower Loans, Loans Held for Sale and Notes	(153)	(205)
Depreciation And Amortization	883	1,220
Gain on Sale of Borrower Loans	(3,971)	(1,928)
Change in Fair Value of Servicing Rights	2,602	485
Changes in Operating Assets and Liabilities:
Purchase of Loans Held for Sale at Fair Value	(931,420)	(540,924)
Proceeds from Sales and Principal Payments of Loans Held for Sale at Fair Value	931,422	547,673
Restricted Cash Except for those Related to Investing Activities	2,511	(19,864)
Other Assets	(387)	(15)
Accounts Payable and Accrued Liabilities	(610)	287
Payable to Investors	(4,225)	23,073
Net Related Party Receivable/Payable	2,111	336
Other Liabilities	82	(82)
Net Cash Provided by (Used in) Operating Activities	4,073	13,941
Cash Flows from Investing Activities:
Purchase of Borrower Loans Held at Fair Value	(55,171)	(47,714)
Principal Payments of Borrower Loans Held at Fair Value	41,599	36,063
Purchases of Property and Equipment	(1,804)	(4,059)
Maturities of Short Term Investments	1,277	1,274
Purchases of Short Term Investments	(1,278)	(1,275)
Changes in Restricted Cash Related to Investing Activities	550	1,860
Net Cash Used in Investing Activities	(14,827)	(13,851)
Cash Flows from Financing Activities:
Proceeds from Issuance of Notes Held at Fair Value	55,273	47,796
Payments of Notes Held at Fair Value	(42,644)	(36,069)
Cash Distributions to Parent		(15,000)
Net Cash Provided by (Used in) Financing Activities	12,629	(3,273)
Net Increase (Decrease) in Cash and Cash Equivalents	1,875	(3,183)
Cash and Cash Equivalents at Beginning of the Period	15,026	23,777
Cash and Cash Equivalents at End of the Period	16,901	20,594
Supplemental Disclosure of Cash Flow Information:
Cash Paid for Interest	9,879	10,444
Non-Cash Investing Activity- Accrual for Property and Equipment, Net	$ 495
Non-Cash Financing Activity, Distribution to Parent		$ 249

Basis of Presentation

Basis of Presentation	3 Months Ended
	Mar. 31, 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 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 consolidated financial statements include BillGuard’s results of operations and financial position from the date of acquisition forward. Reclassifications During the period ended March 31, 2016, Prosper changed the presentation of its revenue in the 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.
Prosper Funding LLC [Member]
Basis of Presentation	1. Basis of Presentation Prosper Funding LLC (“PFL”) was formed in the state of Delaware in February 2012 as a limited liability company with the sole equity member being Prosper Marketplace, Inc. (“PMI”). 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 three months ended March 31, 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. Prosper Funding 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 March 31, 2016, Prosper Funding changed the presentation of its revenue in the 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 call “Gain on Sales of Borrower Loans.”

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 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. 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 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 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 will be 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 beginning after December 15, 2015, and interim periods within those fiscal years, with early adoption permitted. 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 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 will be 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	3 Months Ended
	Mar. 31, 2016
Property and Equipment, Net	3. Property and Equipment, Net Property and equipment consist of the following (in thousands): March 31, December 31, 2016 2015 Property and equipment: Computer equipment $ 12,324 $ 10,522 Internal-use software and website development costs 11,853 10,990 Office equipment and furniture 3,056 2,442 Leasehold improvements 6,897 5,719 Assets not yet placed in service 4,129 3,242 Property and equipment 38,259 32,915 Less accumulated depreciation and amortization (10,116 ) (7,950 ) Total property and equipment, net $ 28,143 $ 24,965 Depreciation and amortization expense for property and equipment for the three months ended March 31, 2016 and 2015 was $2.0 million and $1.9 million, respectively. Prosper capitalized internal-use software and website development costs in the amount of $2.2 million and $1.2 million for the three months ended March 31, 2016 and 2015, respectively.
Prosper Funding LLC [Member]
Property and Equipment, Net	3. Property and Equipment Property and equipment consist of the following (in thousands): March 31, December 31, 2016 2015 Property and equipment: Internal-use software and web site development costs $ 11,853 $ 10,990 Less accumulated depreciation and amortization (3,454 ) (2,571 ) Total property and equipment, net $ 8,399 $ 8,419 Depreciation expense for the three months ended March 31, 2016 and 2015 was $883 thousand and $1,220 thousand, respectively.

Borrower Loans, Loans Held for

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value	3 Months Ended
	Mar. 31, 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 March 31, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 Aggregate principal balance outstanding $ 305,062 $ 296,945 $ (297,183 ) $ (294,331 ) $ 40 $ 42 Fair value adjustments (1,819 ) 328 (5,174 ) (3,074 ) (10 ) (10 ) Fair value $ 303,243 $ 297,273 $ (302,357 ) $ (297,405 ) $ 30 $ 32 At March 31, 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 March 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 $2.3 million represents the loss 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 months ending March 31, 2016. As of March 31, 2016, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $1.6 million and a fair value of $0.6 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 March 31, 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 March 31, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 Aggregate principal balance outstanding $ 305,062 $ 296,945 $ (297,183 ) $ (294,331 ) $ 40 $ 42 Fair value adjustments (1,819 ) 328 (5,174 ) (3,074 ) (10 ) (10 ) Fair value $ 303,243 $ 297,273 $ (302,357 ) $ (297,405 ) $ 30 $ 32 At March 31, 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 March 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 $2.3 million represents the loss 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 months ended March 31, 2016. As of March 31, 2016, Borrower Loans that were 90 days or more delinquent had an aggregate principal amount of $1.6 million and a fair value of $0.6 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 March 31, 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	3 Months Ended
	Mar. 31, 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 and the servicing rights are retained. The servicing assets and liabilities are measured at fair value throughout the servicing period. The total gain recognized on the sale of such Borrower Loans was $3.8 million and $1.9 million for the three months ended March 31, 2016 and 2015, respectively. As of March 31, 2016, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $4.2 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 4.43% to 35.31% and various maturity dates through March 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. $9.6 million and $3.2 million of contractually specified servicing fees and ancillary fees are included on our Statement of Operations in Servicing Fees, Net for the three months ended March 31, 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 and the servicing rights are retained. The servicing assets and liabilities are measured at fair value throughout the servicing period. The total gain recognized on the sale of such Borrower Loans was $3.8 million and $1.9 million for the three months ended March 31, 2016 and 2015, respectively. At March 31, 2016, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights had a total outstanding principal balance of $4.0 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 4.43% to 35.31% and various maturity dates through March 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. $9.4 million and $2.7 million of contractually specified servicing fees and ancillary fees are included on our Statement of Operations in Servicing Fees, Net for the three months ended March 31, 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	3 Months Ended
	Mar. 31, 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 March 31, 2016 are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 45,479 $ 47 $ (15 ) $ 45,511 Commercial paper 4,890 - - 4,890 US Treasury securities 12,543 18 (10 ) 12,551 Agency bonds 2,499 9 - 2,508 Total fixed maturity securities 65,411 74 (25 ) 65,460 Short term bond funds 2,500 - (2 ) 2,498 Total Available for Sale Investments $ 67,911 $ 74 $ (27 ) $ 67,958 A summary of available for sale investments with unrealized losses as of March 31, 2016, aggregated by category and period of continuous unrealized loss, is as follows: Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 12,287 $ (15 ) $ - $ - $ 12,287 $ (15 ) U.S. treasury securities 6,500 (10 ) - - 6,500 (10 ) Agency bonds - - - - - - Total fixed maturity securities 18,787 (25 ) - - 18,787 (25 ) Short term bond funds 2,498 (2 ) - - 2,498 (2 ) Total Investments with Unrealized Losses $ 21,285 $ (27 ) $ - $ - $ 21,285 $ (27 ) There were no impairment charges recognized during the three months ended March 31, 2016. The maturities of available for sale investments at March 31, 2016, are as follows: Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 23,376 $ 22,135 $ - $ - $ 45,511 Commercial paper 4,890 - - - 4,890 US Treasury securities 3,004 9,547 - - 12,551 Agency bonds 2,508 2,508 Total Fair Value $ 31,270 $ 34,190 $ - $ - $ 65,460 Total Amortized Cost $ 31,263 $ 34,148 $ - $ - $ 65,411 Prosper did not sell any available for sale investments during the three months ended March 31, 2016 and as a result did not realize any gains or losses on sale.

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	3 Months Ended
	Mar. 31, 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): March 31, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 303,243 $ 303,243 Loans Held for Sale - - 30 30 Available for Sale Investments, at Fair Value - 67,958 - 67,958 Servicing Assets - - 15,548 15,548 Total Assets - 67,958 318,821 386,779 Liabilities: Notes $ - $ - $ 302,357 $ 302,357 Servicing Liabilities - - 398 398 Contingent Consideration - - 4,866 4,866 Total Liabilities $ - $ - $ 307,621 $ 307,621 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 March 31, 2016 and December 31, 2015: Borrower Loans, Loans Held for Sale and Notes: Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 4.3% - 14.6% 4.3% - 14.5% Default rate 1.5% - 15.1% 1.4% - 14.4% Servicing Rights Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.3% 1.2% - 14.7% Prepayment rate 15.7% - 51.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 % At March 31, 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: 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 55,171 (55,273 ) 931,420 931,318 Principal repayments (40,986 ) 42,062 (4 ) 1,072 Borrower Loans sold to third parties (613 ) 582 (931,418 ) (931,449 ) Other changes (4 ) 157 - 153 Change in fair value (7,598 ) 7,520 - (78 ) Balance at March 31, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 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 47,714 (47,796 ) 540,924 540,842 Principal repayments (36,063 ) 36,069 (364 ) (358 ) Borrower Loans sold to third parties - - (547,309 ) (547,309 ) Other changes 6 207 (8 ) 205 Change in fair value (4,496 ) 4,502 (107 ) (101 ) Balance at March 31, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 The following tables present additional information about level 3 servicing assets and liabilities measured at fair value on a recurring basis: Servicing Assets Servicing Liabilities Fair Value at January 1, 2016 14,363 484 Additions 4,021 9 Less: Changes in fair value (2,836 ) (95 ) Fair Value at March 31, 2016 15,548 398 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 2,078 154 Less: Changes in fair value (753 ) (81 ) Fair Value at March 31, 2015 6,034 668 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 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 Consolidated Balance Sheets. During the three months ended March 31, 2016 there were fair value changes of $0.1 million resulting in a fair value of $4.9 million at March 31, 2016 from the initial 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 March 31, 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: 6.98 %* 6.98 %* Resulting fair value from: 100 basis point increase $ 300,134 $ 299,252 200 basis point increase 297,104 296,225 Resulting fair value from: 100 basis point decrease $ 306,433 $ 305,543 200 basis point decrease 309,709 308,815 Default rate assumption: 10.87 %* 10.87 %* Resulting fair value from: 200 basis point decrease $ 309,402 $ 308,526 100 basis point decrease 306,305 305,423 Resulting fair value from: 100 basis point increase $ 300,206 $ 299,315 200 basis point increase 297,240 296,345 * 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 March 31, 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% 14,419 $ 439 Market servicing rate decrease to 0.60% 16,677 $ 358 Weighted average prepayment assumptions 21.35 % 21.35 % Resulting fair value from: Applying a 1.1 multiplier to default rate 15,152 $ 376 Applying a 0.9 multiplier to default rate 15,771 $ 392 Weighted average default assumptions 11.23 % 11.23 % Resulting fair value from: Applying a 1.1 multiplier to default rate $ 15,314 $ 398 Applying a 0.9 multiplier to default rate $ 15,785 $ 399 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 PFL. 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 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): March 31, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 303,243 $ 303,243 Loans Held for Sale - - 30 30 Servicing Assets - - 14,929 14,929 Total Assets - - 318,202 318,202 Liabilities: Notes $ - $ - $ 302,357 $ 302,357 Servicing Liabilities - - 398 398 Total Liabilities $ - $ - $ 302,755 $ 302,755 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 table presents quantitative information about the significant unobservable inputs used for Prosper Funding’s Borrower Loans, Loans Held for Sale and Notes fair value measurements at March 31, 2016 and December 31, 2015 : Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 4.3% - 14.6% 4.3% - 14.5% Default rate 1.5% - 15.1% 1.4% - 14.4% Key economic assumptions and the sensitivity of the current fair value to immediate changes in those assumptions at March 31, 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: 6.98 %* 6.98 %* Resulting fair value from: 100 basis point increase $ 300,134 $ 299,252 200 basis point increase 297,104 296,225 Resulting fair value from: 100 basis point decrease $ 306,433 $ 305,543 200 basis point decrease 309,709 308,815 Default rate assumption: 10.87 %* 10.87 %* Resulting fair value from: 200 basis point decrease $ 309,402 $ 308,526 100 basis point decrease 306,305 305,423 Resulting fair value from: 100 basis point increase $ 300,206 $ 299,315 200 basis point increase 297,240 296,345 * Represents weighted average assumptions considering all credit grades. These sensitivities are hypothetical and should be evaluated with care. The effect on fair value of a fixed basis points 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. 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, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Originations 47,714 (47,796 ) 540,924 540,842 Principal repayments (36,063 ) 36,069 (364 ) (358 ) Borrower Loans sold to third parties - - (547,309 ) (547,309 ) Other changes 6 207 (8 ) 205 Change in fair value (4,496 ) 4,502 (107 ) (101 ) Balance at March 31, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 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 55,171 (55,273 ) 931,420 931,318 Principal repayments (40,986 ) 42,062 (4 ) 1,072 Borrower Loans sold to third parties (613 ) 582 (931,418 ) (931,449 ) Other changes (4 ) 157 - 153 Change in fair value (7,598 ) 7,520 - (78 ) Balance at March 31, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 Significant Unobservable Inputs The following table presents quantitative information about the significant unobservable inputs used for Prosper Funding's servicing asset/liability fair value measurements at March 31, 2016 and December 31, 2015: Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.3% 1.2% - 14.7% Prepayment rate 15.7% - 51.6% 14.3% - 25.6% Market servicing rate 0.625 % 0.625 % Loan Servicing Assets and Liabilities Activity: The following table presents additional information about Level 3 servicing assets and liabilities recorded at fair value for the three months ended March 31, 2016 (in thousands). Servicing Servicing Assets Liabilities Fair Value at January 1, 2016 13,605 484 Additions 4,021 9 Less: Changes in fair value (2,697 ) (95 ) Fair Value at March 31, 2016 14,929 398 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 2,078 154 Less: Transfers to PMI (249 ) - Less: Changes in fair value (562 ) (81 ) Fair Value at March 31, 2015 4,782 668 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 March 31, 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% 14,049 439 Market servicing rate decrease to 0.60% 16,250 358 Weighted average prepayment assumptions 21.35 % 21.35 % Resulting fair value from: Applying a 1.1 multiplier to default rate 14,632 376 Applying a 0.9 multiplier to default rate 15,230 392 Weighted average default assumptions 11.23 % 11.23 % Resulting fair value from: Applying a 1.1 multiplier to default rate 14,704 398 Applying a 0.9 multiplier to default rate 15,156 399 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	3 Months Ended
	Mar. 31, 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	3 Months Ended
	Mar. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill and Intangible Assets Disclosure	9. Goodwill and Other Intangible Assets Goodwill Prosper’s goodwill balance of $36.4 million at March 31, 2016 did not significantly change during the three months ended March 31, 2016. We did not record any goodwill impairment expense for the three months ended March 31, 2016. Other Intangible Assets The following table presents the detail of other intangible assets for the periods presented (dollars in thousands): March 31, 2016 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) User base and customer relationships $ 6,250 $ (1,413 ) $ 4,837 8.8 Developed technology 8,310 (1,064 ) 7,246 4.5 Brand name 60 (60 ) - - Total intangible assets subject to amortization $ 14,620 $ (2,537 ) $ 12,083 Prosper’s intangible asset balance was $12.1 million and $13.1 million at March 31, 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 March 31, 2016 and 2015 was $1.0 million and $0.1 million, respectively. Estimated amortization of purchased intangible assets for future periods is as follows (in thousands): Year Ending December 31, 2016 $ 2,869 2017 3,260 2018 2,329 2019 1,779 2020 1,344 Thereafter 502 Total $ 12,083

Other Liabilities

Other Liabilities	3 Months Ended
	Mar. 31, 2016
Other Liabilities [Abstract]
Other Liabilities	10. Other Liabilities Other Liabilities includes the following: March 31, 2016 December 31, 2015 Class action settlement liability $ 2,961 $ 5,949 Repurchase liability for unvested restricted stock awards 350 473 Contingent consideration 4,866 4,801 Deferred revenue 450 1,591 Servicing liabilities 398 484 Deferred rent 5,341 5,240 Other 1,908 2,197 Total Other Liabilities $ 16,274 $ 20,735

Net Loss Per Share

Net Loss Per Share	3 Months Ended
	Mar. 31, 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 March 31, 2016 2015 Numerator: Net loss available to common stockholders for basic and diluted EPS $ (17,464 ) $ (7,276 ) Denominator: Weighted average shares used in computing basic and diluted net loss per share 60,357,488 52,766,255 Basic and diluted net loss per share $ (0.29 ) $ (0.14 ) 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 March 31, 2016 2015 (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding 177,388,425 153,499,785 Stock options issued and outstanding 39,088,308 35,193,640 Unvested stock options exercised 7,694,370 18,635,210 Restricted stock units 2,380,956 - Warrants issued and outstanding 536,685 626,465 Total common stock equivalents excluded from diluted net loss per common share computation 227,088,744 207,955,100 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	3 Months Ended
	Mar. 31, 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 March 31, 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, is the sole issuer of common stock and related options, RSUs and warrants. On February 16, 2016, Prosper amended and restated its certificate of incorporation to effect a 5-for-1 forward stock split. The total number of shares of stock which Prosper has the authority to issue is 464,214,500, consisting of 286,826,075 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 March 31, 2016, 70,629,640 shares of common stock were issued and 69,693,705 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 three months ended March 31, 2016, PMI issued 281,820 shares of common stock upon the exercise of vested options for cash proceeds of $0.24 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 March 31, 2016 and December 31, 2015, there were 7,694,370 and 9,806,170 shares respectively of restricted stock outstanding that remain unvested and subject to Prosper’s right of repurchase. For the three months ended March 31, 2016, PMI repurchased 39,435 shares of restricted stock for $46 thousand upon termination of employment of various employees. Common Stock Issued upon Exercise of Warrants For the three months ended March 31, 2016, PMI issued 19,830 shares of common stock upon the exercise of warrants for aggregate proceeds of $9 thousand.

Shared Based Incentive Plan and

Shared Based Incentive Plan and Compensation	3 Months Ended
	Mar. 31, 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 (as amended, the “2015 Plan”). As of March 31, 2016 under the 2005 Plan, up to 69,433,425 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 March 31, 2016 under the 2015 Plan, up to 30,409,945 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 At March 31, 2016, there were 17,015,710 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. Early Exercised Stock Options The activity of options that were early exercised under the 2005 Plan for the three months ended March 31, 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 (39,435 ) 1.16 Restricted stock vested (2,072,365 ) 0.04 Balance as of March 31, 2016 7,694,370 $ 0.05 Additional information regarding the unvested early exercised stock options outstanding as of March 31, 2016 is as follows: Options Outstanding Range of Exercise Number Weighted –Avg. Weighted –Avg. Prices Outstanding Remaining Life Exercise Price 0.02 7,108,965 0.9 $ 0.02 0.11 446,930 1.9 0.11 1.13 138,475 2.3 1.13 $0.02 - $1.13 7,694,370 1.0 $ 0.04 Stock Option Activity Stock option activity under the 2005 Plan and 2015 Plan is summarized for the three months ended March 31, 2016 below: Options Issued and Outstanding Weighted- Average Exercise Price Balance as of January 1, 2016 40,425,605 $ 2.64 Options exercised – vested (281,820 ) 0.86 Options forfeited (1,242,430 ) 3.98 Balance as of March 31, 2016 38,901,355 2.61 Options vested and/or exercisable at March 31, 2016 27,461,505 1.67 For the three months ended March 31, 2016, PMI did not grant any new options to purchase shares of common stock. Other Information Regarding Stock Options Additional information regarding common stock options outstanding as of March 31, 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 13,514,280 7.65 $ 0.12 13,511,425 $ 0.12 1.00 -2.99 4,370,570 8.32 1.13 2,701,235 1.13 3.00 - 4.99 11,000,095 8.88 3.62 11,000,095 3.62 5.00- 5.52 10,016,410 9.48 5.50 248,750 5.45 $ 0.02 - 5.52 38,901,355 8.55 $ 2.61 27,461,505 $ 1.67 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 March 31, 2016 and 2015 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended March 31, 2016 2015 Volatility of common stock N/A 55.59 % Risk-free interest rate N/A 1.61 % Expected life N/A 5.7 years Dividend yield N/A 0 % There were no stock options granted in the three months ended March 31, 2016 . Restricted Stock Unit Activity During the three months ended March 31, 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 $12.9 million. The following table summarizes the activities for PMI’s RSUs during the first quarter of 2016: Number of Shares Weighted-Average Grant Date Fair Value Unvested - December 31, 2015 1,835,510 $ 5.52 Granted 2,661,255 2.14 Vested - - Forfeited (6,750 ) 2.14 Unvested - March 31, 2016 4,490,015 $ 2.86 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 March 31, 2016 and 2015 (in thousands): Three Months Ended March 31, 2016 2015 Origination and servicing $ 439 $ 144 Sales and marketing 736 388 General and administrative 3,932 907 Total stock based compensation $ 5,107 $ 1,439 During the three months ended March 31, 2016 and 2015, Prosper capitalized $210 thousand and $122 thousand respectively, of stock-based compensation as internal use software and website development costs. As of March 31, 2016, the unamortized stock-based compensation expense adjusted for forfeiture estimates related to Prosper’s employees’ unvested stock-based awards was approximately $49.1 million, which will be recognized over the remaining weighted-average vesting period of approximately 3 years.

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2016
Income Taxes [Line Items]
Income Taxes	14. Income Taxes For the three months ended March 31, 2016 and 2015, Prosper recognized $165 thousand and $73 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 three month periods ended March 31, 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 three months ended March 31, 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, 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	3 Months Ended
	Mar. 31, 2016
Commitments and Contingencies	15. 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 March 31, 2016 are as follows (in thousands): Remaining nine months of 2016 5,104 2017 9,643 2018 10,510 2019 10,739 2020 11,253 2021 11,364 Thereafter 32,173 Total future operating lease obligations $ 90,786 Rental expense under operating lease arrangements was $1.8 million and $0.8 million for the three months ended March 31, 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 annual fee for the year ended December 31, 2016 is $1.4 million. Loan Purchase Commitments Prosper has entered into an agreement with WebBank to purchase $17.0 million of Borrower Loans that WebBank originated during the last business day of the quarter ending March 31, 2016 and first business day of the quarter ending June 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 March 31, 2016 is $4,219 million. Prosper has accrued $346 thousand and $510 thousand as of March 31, 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 March 31, 2015 and the reserve for the class action settlement liability is $3.0 million in the condensed consolidated balance sheet as of March 31, 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 annual fee for the year ended December 31, 2016 is $1.4 million. Loan Purchase Commitments Under the terms of Prosper Funding’s agreement with WebBank, Prosper Funding is committed to purchase $17.0 million of Borrower Loans that WebBank originated during the last business day of the quarter ending March 31, 2016 and first business day of the quarter ending June 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 March 31, 2016 is $4,033 million. Prosper Funding had accrued $296 thousand and $460 thousand as of March 31, 2016 and December 31, 2015 in regard to this obligation, respectively.

Related Parties

Related Parties	3 Months Ended
	Mar. 31, 2016
Related Parties	16. 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. The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three months ended March 31, 2016 and 2015, as well as the Notes outstanding as of March 31, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2016 2015 2016 2015 Executive officers and management $ 405 $ 479 $ 49 $ 47 Directors 236 10 6 2 Total $ 641 $ 489 $ 55 $ 49 Notes Balance as of Related Party March 31, 2016 December 31, 2015 Executive officers and management $ 1,980 $ 1,912 Directors 469 325 $ 2,449 $ 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, directors who are not executive officers participate in its marketplace by placing bids and purchasing Notes. The aggregate amount of the Notes purchased and the income earned by parties deemed to be related parties of Prosper as of March 31, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2016 2015 2016 2015 Executive officers and management $ 405 $ 479 $ 49 $ 47 Directors - - - - Total $ 405 $ 479 $ 49 $ 47 Note Balance as of Related Party March 31, 2016 December 31, 2015 Executive officers and management $ 1,980 $ 1,912 Directors - - $ 1,980 $ 1,912

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2016
Subsequent Events [Abstract]
Subsequent Events	17. Subsequent Events On May 3, 2016, Prosper notified employees of a strategic restructuring of its business Prosper notified employees of the restructuring. This restructuring is intended to streamline our operations and support future growth efforts. Under this restructuring, Prosper intends to close its Salt Lake City, Utah location and expects to terminate or relocate approximately 97 employees based in our Salt Lake City office. In addition, Prosper expects this restructuring to result in the termination of approximately 73 employees at its locations in San Francisco, California and Phoenix, Arizona. Prosper expects to incur charges of approximately $5.9 million in the second and third quarters of 2016, substantially all of which are related to employee severance and benefits. Additionally, Prosper expects to incur lease exit costs and other contract-related charges. We are still evaluating the financial statement impact of these charges. The actions associated with this restructuring are expected to be fully completed by the third quarter of 2016. Also, on May 3, 2016, the Compensation Committee of the Board of Directors of PMI gave PMI’s officers the authority 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. 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. We are still evaluating the financial statement impact of this repricing.

Summary of Significant Accoun24

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 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 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 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 consolidated financial statements include BillGuard’s results of operations and financial position from the date of acquisition forward.
Reclassifications	Reclassifications During the period ended March 31, 2016, Prosper changed the presentation of its revenue in the 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.
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.
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 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 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 will be 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 beginning after December 15, 2015, and interim periods within those fiscal years, with early adoption permitted. 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 in February 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 three months ended March 31, 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. Prosper Funding 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 March 31, 2016, Prosper Funding changed the presentation of its revenue in the 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 call “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 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 will be 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)	3 Months Ended
	Mar. 31, 2016
Property and Equipment, Net	Property and equipment consist of the following (in thousands): March 31, December 31, 2016 2015 Property and equipment: Computer equipment $ 12,324 $ 10,522 Internal-use software and website development costs 11,853 10,990 Office equipment and furniture 3,056 2,442 Leasehold improvements 6,897 5,719 Assets not yet placed in service 4,129 3,242 Property and equipment 38,259 32,915 Less accumulated depreciation and amortization (10,116 ) (7,950 ) Total property and equipment, net $ 28,143 $ 24,965
Prosper Funding LLC [Member]
Property and Equipment, Net	Property and equipment consist of the following (in thousands): March 31, December 31, 2016 2015 Property and equipment: Internal-use software and web site development costs $ 11,853 $ 10,990 Less accumulated depreciation and amortization (3,454 ) (2,571 ) Total property and equipment, net $ 8,399 $ 8,419

Borrower Loans, Loans Held fo26

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 Aggregate principal balance outstanding $ 305,062 $ 296,945 $ (297,183 ) $ (294,331 ) $ 40 $ 42 Fair value adjustments (1,819 ) 328 (5,174 ) (3,074 ) (10 ) (10 ) Fair value $ 303,243 $ 297,273 $ (302,357 ) $ (297,405 ) $ 30 $ 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 March 31, 2016 and December 31, 2015, are presented in the following table (in thousands): Borrower Loans Notes Loans Held for Sale March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 March 31, 2016 December 31, 2015 Aggregate principal balance outstanding $ 305,062 $ 296,945 $ (297,183 ) $ (294,331 ) $ 40 $ 42 Fair value adjustments (1,819 ) 328 (5,174 ) (3,074 ) (10 ) (10 ) Fair value $ 303,243 $ 297,273 $ (302,357 ) $ (297,405 ) $ 30 $ 32

Available for Sale Investment27

Available for Sale Investments, at Fair Value (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Fixed maturity securities: Corporate debt securities $ 45,479 $ 47 $ (15 ) $ 45,511 Commercial paper 4,890 - - 4,890 US Treasury securities 12,543 18 (10 ) 12,551 Agency bonds 2,499 9 - 2,508 Total fixed maturity securities 65,411 74 (25 ) 65,460 Short term bond funds 2,500 - (2 ) 2,498 Total Available for Sale Investments $ 67,911 $ 74 $ (27 ) $ 67,958
Summary of Securities Available for Sale of Continuous Unrealized Loss	A summary of available for sale investments with unrealized losses as of March 31, 2016, aggregated by category and period of continuous unrealized loss, is as follows: Less than 12 months 12 months or longer Total Fair Value Unrealized Losses Fair Value Unrealized Losses Fair Value Unrealized Losses Fixed maturity securities: Corporate debt securities $ 12,287 $ (15 ) $ - $ - $ 12,287 $ (15 ) U.S. treasury securities 6,500 (10 ) - - 6,500 (10 ) Agency bonds - - - - - - Total fixed maturity securities 18,787 (25 ) - - 18,787 (25 ) Short term bond funds 2,498 (2 ) - - 2,498 (2 ) Total Investments with Unrealized Losses $ 21,285 $ (27 ) $ - $ - $ 21,285 $ (27 )
Schedule of Maturities of Securities Available for Sale	The maturities of available for sale investments at March 31, 2016, are as follows: Within 1 year After 1 year through 5 years After 5 years to 10 years After 10 years Total Corporate debt securities $ 23,376 $ 22,135 $ - $ - $ 45,511 Commercial paper 4,890 - - - 4,890 US Treasury securities 3,004 9,547 - - 12,551 Agency bonds 2,508 2,508 Total Fair Value $ 31,270 $ 34,190 $ - $ - $ 65,460 Total Amortized Cost $ 31,263 $ 34,148 $ - $ - $ 65,411

Fair Value of Assets and Liab28

Fair Value of Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 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) March 31, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 303,243 $ 303,243 Loans Held for Sale - - 30 30 Available for Sale Investments, at Fair Value - 67,958 - 67,958 Servicing Assets - - 15,548 15,548 Total Assets - 67,958 318,821 386,779 Liabilities: Notes $ - $ - $ 302,357 $ 302,357 Servicing Liabilities - - 398 398 Contingent Consideration - - 4,866 4,866 Total Liabilities $ - $ - $ 307,621 $ 307,621 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 March 31, 2016 December 31, 2015 Discount rate 4.3% - 14.6% 4.3% - 14.5% Default rate 1.5% - 15.1% 1.4% - 14.4%
Significant Unobservable Inputs Fair Value	Servicing Rights Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.3% 1.2% - 14.7% Prepayment rate 15.7% - 51.6% 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 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 55,171 (55,273 ) 931,420 931,318 Principal repayments (40,986 ) 42,062 (4 ) 1,072 Borrower Loans sold to third parties (613 ) 582 (931,418 ) (931,449 ) Other changes (4 ) 157 - 153 Change in fair value (7,598 ) 7,520 - (78 ) Balance at March 31, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916 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 47,714 (47,796 ) 540,924 540,842 Principal repayments (36,063 ) 36,069 (364 ) (358 ) Borrower Loans sold to third parties - - (547,309 ) (547,309 ) Other changes 6 207 (8 ) 205 Change in fair value (4,496 ) 4,502 (107 ) (101 ) Balance at March 31, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202
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: Servicing Assets Servicing Liabilities Fair Value at January 1, 2016 14,363 484 Additions 4,021 9 Less: Changes in fair value (2,836 ) (95 ) Fair Value at March 31, 2016 15,548 398 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 2,078 154 Less: Changes in fair value (753 ) (81 ) Fair Value at March 31, 2015 6,034 668
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 March 31, 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: 6.98 %* 6.98 %* Resulting fair value from: 100 basis point increase $ 300,134 $ 299,252 200 basis point increase 297,104 296,225 Resulting fair value from: 100 basis point decrease $ 306,433 $ 305,543 200 basis point decrease 309,709 308,815 Default rate assumption: 10.87 %* 10.87 %* Resulting fair value from: 200 basis point decrease $ 309,402 $ 308,526 100 basis point decrease 306,305 305,423 Resulting fair value from: 100 basis point increase $ 300,206 $ 299,315 200 basis point increase 297,240 296,345 * 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 March 31, 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% 14,419 $ 439 Market servicing rate decrease to 0.60% 16,677 $ 358 Weighted average prepayment assumptions 21.35 % 21.35 % Resulting fair value from: Applying a 1.1 multiplier to default rate 15,152 $ 376 Applying a 0.9 multiplier to default rate 15,771 $ 392 Weighted average default assumptions 11.23 % 11.23 % Resulting fair value from: Applying a 1.1 multiplier to default rate $ 15,314 $ 398 Applying a 0.9 multiplier to default rate $ 15,785 $ 399
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): March 31, 2016 Level 1 Inputs Level 2 Inputs Level 3 Inputs Total Assets: Borrower Loans $ - $ - $ 303,243 $ 303,243 Loans Held for Sale - - 30 30 Servicing Assets - - 14,929 14,929 Total Assets - - 318,202 318,202 Liabilities: Notes $ - $ - $ 302,357 $ 302,357 Servicing Liabilities - - 398 398 Total Liabilities $ - $ - $ 302,755 $ 302,755 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 table presents quantitative information about the significant unobservable inputs used for Prosper Funding’s Borrower Loans, Loans Held for Sale and Notes fair value measurements at March 31, 2016 and December 31, 2015 : Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 4.3% - 14.6% 4.3% - 14.5% Default rate 1.5% - 15.1% 1.4% - 14.4% The following table presents quantitative information about the significant unobservable inputs used for Prosper Funding's servicing asset/liability fair value measurements at March 31, 2016 and December 31, 2015: Range Unobservable Input March 31, 2016 December 31, 2015 Discount rate 15% - 25% 15% - 25% Default rate 1.1% - 15.3% 1.2% - 14.7% Prepayment rate 15.7% - 51.6% 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, 2015 $ 273,243 $ (273,783 ) $ 8,463 $ 7,923 Originations 47,714 (47,796 ) 540,924 540,842 Principal repayments (36,063 ) 36,069 (364 ) (358 ) Borrower Loans sold to third parties - - (547,309 ) (547,309 ) Other changes 6 207 (8 ) 205 Change in fair value (4,496 ) 4,502 (107 ) (101 ) Balance at March 31, 2015 $ 280,404 $ (280,801 ) $ 1,599 $ 1,202 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 55,171 (55,273 ) 931,420 931,318 Principal repayments (40,986 ) 42,062 (4 ) 1,072 Borrower Loans sold to third parties (613 ) 582 (931,418 ) (931,449 ) Other changes (4 ) 157 - 153 Change in fair value (7,598 ) 7,520 - (78 ) Balance at March 31, 2016 $ 303,243 $ (302,357 ) $ 30 $ 916
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 March 31, 2016 (in thousands). Servicing Servicing Assets Liabilities Fair Value at January 1, 2016 13,605 484 Additions 4,021 9 Less: Changes in fair value (2,697 ) (95 ) Fair Value at March 31, 2016 14,929 398 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 2,078 154 Less: Transfers to PMI (249 ) - Less: Changes in fair value (562 ) (81 ) Fair Value at March 31, 2015 4,782 668
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 March 31, 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: 6.98 %* 6.98 %* Resulting fair value from: 100 basis point increase $ 300,134 $ 299,252 200 basis point increase 297,104 296,225 Resulting fair value from: 100 basis point decrease $ 306,433 $ 305,543 200 basis point decrease 309,709 308,815 Default rate assumption: 10.87 %* 10.87 %* Resulting fair value from: 200 basis point decrease $ 309,402 $ 308,526 100 basis point decrease 306,305 305,423 Resulting fair value from: 100 basis point increase $ 300,206 $ 299,315 200 basis point increase 297,240 296,345 * 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 Funding’s estimated fair value of servicing assets and liabilities, calculated using different market servicing rates and different default rates as of March 31, 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% 14,049 439 Market servicing rate decrease to 0.60% 16,250 358 Weighted average prepayment assumptions 21.35 % 21.35 % Resulting fair value from: Applying a 1.1 multiplier to default rate 14,632 376 Applying a 0.9 multiplier to default rate 15,230 392 Weighted average default assumptions 11.23 % 11.23 % Resulting fair value from: Applying a 1.1 multiplier to default rate 14,704 398 Applying a 0.9 multiplier to default rate 15,156 399

Goodwill and Other Intangible29

Goodwill and Other Intangible Assets (Tables)	3 Months Ended
	Mar. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Other Intangible Assets for the Periods Presented	The following table presents the detail of other intangible assets for the periods presented (dollars in thousands): March 31, 2016 Gross Carrying Value Accumulated Amortization Net Carrying Value Remaining Useful Life (In Years) User base and customer relationships $ 6,250 $ (1,413 ) $ 4,837 8.8 Developed technology 8,310 (1,064 ) 7,246 4.5 Brand name 60 (60 ) - - Total intangible assets subject to amortization $ 14,620 $ (2,537 ) $ 12,083
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 $ 2,869 2017 3,260 2018 2,329 2019 1,779 2020 1,344 Thereafter 502 Total $ 12,083

Other Liabilities (Tables)

Other Liabilities (Tables)	3 Months Ended
	Mar. 31, 2016
Other Liabilities [Abstract]
Schedule of Other Liabilities	Other Liabilities includes the following: March 31, 2016 December 31, 2015 Class action settlement liability $ 2,961 $ 5,949 Repurchase liability for unvested restricted stock awards 350 473 Contingent consideration 4,866 4,801 Deferred revenue 450 1,591 Servicing liabilities 398 484 Deferred rent 5,341 5,240 Other 1,908 2,197 Total Other Liabilities $ 16,274 $ 20,735

Net Loss Per Share (Tables)

Net Loss Per Share (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 2015 Numerator: Net loss available to common stockholders for basic and diluted EPS $ (17,464 ) $ (7,276 ) Denominator: Weighted average shares used in computing basic and diluted net loss per share 60,357,488 52,766,255 Basic and diluted net loss per share $ (0.29 ) $ (0.14 )
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 March 31, 2016 2015 (shares) (shares) Excluded securities: Convertible preferred stock issued and outstanding 177,388,425 153,499,785 Stock options issued and outstanding 39,088,308 35,193,640 Unvested stock options exercised 7,694,370 18,635,210 Restricted stock units 2,380,956 - Warrants issued and outstanding 536,685 626,465 Total common stock equivalents excluded from diluted net loss per common share computation 227,088,744 207,955,100

Convertible Preferred Stock a32

Convertible Preferred Stock and Stockholders' Deficit (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 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 a33

Shared Based Incentive Plan and Compensation (Tables)	3 Months Ended
	Mar. 31, 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 three months ended March 31, 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 (39,435 ) 1.16 Restricted stock vested (2,072,365 ) 0.04 Balance as of March 31, 2016 7,694,370 $ 0.05
Additional Information Regarding the Unvested Early Exercised Stock Options Outstanding	Additional information regarding the unvested early exercised stock options outstanding as of March 31, 2016 is as follows: Options Outstanding Range of Exercise Number Weighted –Avg. Weighted –Avg. Prices Outstanding Remaining Life Exercise Price 0.02 7,108,965 0.9 $ 0.02 0.11 446,930 1.9 0.11 1.13 138,475 2.3 1.13 $0.02 - $1.13 7,694,370 1.0 $ 0.04
Summarized Option Activity under Option Plan	Stock option activity under the 2005 Plan and 2015 Plan is summarized for the three months ended March 31, 2016 below: Options Issued and Outstanding Weighted- Average Exercise Price Balance as of January 1, 2016 40,425,605 $ 2.64 Options exercised – vested (281,820 ) 0.86 Options forfeited (1,242,430 ) 3.98 Balance as of March 31, 2016 38,901,355 2.61 Options vested and/or exercisable at March 31, 2016 27,461,505 1.67
Additional Information Regarding Common Stock Options Outstanding	Additional information regarding common stock options outstanding as of March 31, 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 13,514,280 7.65 $ 0.12 13,511,425 $ 0.12 1.00 -2.99 4,370,570 8.32 1.13 2,701,235 1.13 3.00 - 4.99 11,000,095 8.88 3.62 11,000,095 3.62 5.00- 5.52 10,016,410 9.48 5.50 248,750 5.45 $ 0.02 - 5.52 38,901,355 8.55 $ 2.61 27,461,505 $ 1.67
Fair Value of Stock Option Awards	The fair value of PMI’s stock option awards granted during the three months ended March 31, 2016 and 2015 was estimated at the date of grant using the Black-Scholes model with the following average assumptions: Three Months Ended March 31, 2016 2015 Volatility of common stock N/A 55.59 % Risk-free interest rate N/A 1.61 % Expected life N/A 5.7 years Dividend yield N/A 0 %
Summarized Activities for RSU's	The following table summarizes the activities for PMI’s RSUs during the first quarter of 2016: Number of Shares Weighted-Average Grant Date Fair Value Unvested - December 31, 2015 1,835,510 $ 5.52 Granted 2,661,255 2.14 Vested - - Forfeited (6,750 ) 2.14 Unvested - March 31, 2016 4,490,015 $ 2.86
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 March 31, 2016 and 2015 (in thousands): Three Months Ended March 31, 2016 2015 Origination and servicing $ 439 $ 144 Sales and marketing 736 388 General and administrative 3,932 907 Total stock based compensation $ 5,107 $ 1,439

Commitments and Contingencies (

Commitments and Contingencies (Tables)	3 Months Ended
	Mar. 31, 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 March 31, 2016 are as follows (in thousands): Remaining nine months of 2016 5,104 2017 9,643 2018 10,510 2019 10,739 2020 11,253 2021 11,364 Thereafter 32,173 Total future operating lease obligations $ 90,786

Related Parties (Tables)

Related Parties (Tables)	3 Months Ended
	Mar. 31, 2016
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes purchased and the income earned by parties deemed to be affiliates and related parties of Prosper for the three months ended March 31, 2016 and 2015, as well as the Notes outstanding as of March 31, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2016 2015 2016 2015 Executive officers and management $ 405 $ 479 $ 49 $ 47 Directors 236 10 6 2 Total $ 641 $ 489 $ 55 $ 49 Notes Balance as of Related Party March 31, 2016 December 31, 2015 Executive officers and management $ 1,980 $ 1,912 Directors 469 325 $ 2,449 $ 2,237
Prosper Funding LLC [Member]
Aggregate Amount of Notes Purchased and the Income Earned	The aggregate amount of the Notes purchased and the income earned by parties deemed to be related parties of Prosper as of March 31, 2016 and December 31, 2015 are summarized below (in thousands): Aggregate Amount of Notes Purchased Interest Earned on Notes Three Months Ended March 31, Three Months Ended March 31, Related Party 2016 2015 2016 2015 Executive officers and management $ 405 $ 479 $ 49 $ 47 Directors - - - - Total $ 405 $ 479 $ 49 $ 47 Note Balance as of Related Party March 31, 2016 December 31, 2015 Executive officers and management $ 1,980 $ 1,912 Directors - - $ 1,980 $ 1,912

Property and Equipment, Net (De

Property and Equipment, Net (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 38,259	$ 32,915
Less accumulated depreciation and amortization	(10,116)	(7,950)
Total property and equipment, net	28,143	24,965
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Less accumulated depreciation and amortization	(3,454)	(2,571)
Total property and equipment, net	8,399	8,419
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	12,324	10,522
Internal-use Software and Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	11,853	10,990
Internal-use Software and Website Development Costs [Member] | Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	11,853	10,990
Office Equipment and Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	3,056	2,442
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	6,897	5,719
Assets Not Yet Placed in Service [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 4,129	$ 3,242

Property and Equipment, Net - A

Property and Equipment, Net - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation And Amortization	$ 2,971		$ 1,850
Prosper Funding LLC [Member]
Property, Plant and Equipment [Line Items]
Depreciation And Amortization	883		$ 1,220
Property Plant And Equipment [Member]
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	2,000	$ 1,900
Internal-use Software and Website Development Costs [Member]
Property, Plant and Equipment [Line Items]
Capitalized internal-use software and website development costs	$ 2,200	$ 1,200

Borrower Loans, Loans Held fo38

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	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair Value	$ 303,243	$ 297,273
Notes at Fair Value	(302,357)	(297,405)
Loans Held for Sale, at Fair Value	30	32
Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Borrower Loans, at Fair Value	303,243	297,273
Notes at Fair Value	(302,357)	(297,405)
Loans Held for Sale, at Fair Value	30	32
Notes [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Notes	(297,183)	(294,331)
Fair value adjustments	(5,174)	(3,074)
Notes at Fair Value	(302,357)	(297,405)
Notes [Member] | Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Notes	(297,183)	(294,331)
Fair value adjustments	(5,174)	(3,074)
Notes at Fair Value	(302,357)	(297,405)
Borrower Loans [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Aggregate principal balance outstanding, Borrower Loans	305,062	296,945
Fair value adjustments	(1,819)	328
Borrower Loans, at Fair Value	303,243	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	305,062	296,945
Fair value adjustments	(1,819)	328
Borrower Loans, at Fair Value	303,243	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	40	42
Loans Held for Sale, at Fair Value	30	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	40	42
Loans Held for Sale, at Fair Value	$ 30	$ 32

Borrower Loans, Loans Held fo39

Borrower Loans, Loans Held for Sale, and Notes Held at Fair Value - Additional Information (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loss related to credit risks on borrower loans	$ 2.3
Minimum number of days for which loans originated were delinquent	90 days	90 days
Aggregate principal amount of loans originated	$ 1.6	$ 2.3
Non accrual status past due date	120 days
Fair value of loans originated	$ 0.6	0.9
Borrower Loans receivable	0.2	$ 0.1
Prosper Funding LLC [Member]
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Loss related to credit risks on borrower loans	$ 2.3
Minimum number of days for which loans originated were delinquent	90 days	90 days
Aggregate principal amount of loans originated	$ 1.6	$ 2.3
Non accrual status past due date	120 days
Fair value of loans originated	$ 0.6	0.9
Borrower Loans receivable	$ 0.2	$ 0.1
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	Mar. 31, 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	Mar. 31, 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 Lia40

Loan Servicing Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Servicing Assets And Liabilities Fair Value [Line Items]
Gain on sale of borrower loans	$ 3,791	$ 1,922
Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Gain on sale of borrower loans	3,791	1,922
Borrower Loans [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	$ 4,200,000		$ 3,800,000
Borrower loans original maturity term, description	Original terms of either 36 or 60 months
Fixed interest rate, Minimum	4.43%		5.32%
Fixed interest rate, Maximum	35.31%		31.90%
Loans maturity date	Mar. 31, 2021		Dec. 31, 2020
Debt instrument servicing rights, Description	As of March 31, 2016, Borrower Loans that were sold but for which Prosper retained servicing rights had a total outstanding principal balance of $4.2 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 4.43% to 35.31% and various maturity dates through March 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	$ 9,600	3,200
Borrower Loans [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Outstanding principle	$ 4,000,000		$ 3,600,000
Borrower loans original maturity term, description	Original terms of either 36 or 60 months
Fixed interest rate, Minimum	4.43%		5.32%
Fixed interest rate, Maximum	35.31%		31.90%
Loans maturity date	Mar. 31, 2021		Dec. 31, 2020
Debt instrument servicing rights, Description	At March 31, 2016, Borrower Loans that were sold, but for which Prosper Funding retained servicing rights had a total outstanding principal balance of $4.0 billion, original terms of either 36 or 60 months and had monthly payments with fixed interest rates ranging from 4.43% to 35.31% and various maturity dates through March 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	$ 9,400	$ 2,700

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	Mar. 31, 2016	Dec. 31, 2015
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	$ 67,911
Gross Unrealized Gains	74
Gross Unrealized Losses	(27)
Available for Sale Investments, at Fair Value	67,958	$ 73,187
Short Term Bond Funds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,500
Gross Unrealized Losses	(2)
Available for Sale Investments, at Fair Value	2,498
Fixed Maturity Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	65,411
Gross Unrealized Gains	74
Gross Unrealized Losses	(25)
Available for Sale Investments, at Fair Value	65,460
Fixed Maturity Securities | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	45,479
Gross Unrealized Gains	47
Gross Unrealized Losses	(15)
Available for Sale Investments, at Fair Value	45,511
Fixed Maturity Securities | Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	4,890
Available for Sale Investments, at Fair Value	4,890
Fixed Maturity Securities | U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	12,543
Gross Unrealized Gains	18
Gross Unrealized Losses	(10)
Available for Sale Investments, at Fair Value	12,551
Fixed Maturity Securities | Agency Bonds
Schedule Of Available For Sale Securities [Line Items]
Amortized Cost	2,499
Gross Unrealized Gains	9
Available for Sale Investments, at Fair Value	$ 2,508

Available for Sale Investment42

Available for Sale Investments at Fair Value - Summary of Available for Sale Investments of Continuous Unrealized Loss (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	$ 21,285
Unrealized losses, less than 12 months	(27)
Fair Value	21,285
Unrealized losses	(27)
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	18,787
Unrealized losses, less than 12 months	(25)
Fair Value	18,787
Unrealized losses	(25)
Fixed Maturity Securities | Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	12,287
Unrealized losses, less than 12 months	(15)
Fair Value	12,287
Unrealized losses	(15)
Fixed Maturity Securities | U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value, less than 12 months	6,500
Unrealized losses, less than 12 months	(10)
Fair Value	6,500
Unrealized losses	$ (10)

Available for Sale Investment43

Available for Sale Investments at Fair Value - Additional Information (Details)	3 Months Ended
	Mar. 31, 2016USD ($)
Segment Reporting [Abstract]
Impairment charges recognized during period	$ 0
Available-for-sale investments, realized gains	$ 0

Available for Sale Investment44

Available for Sale Investments at Fair Value - Schedule of Maturities of Available for Sale Investments (Details) $ in Thousands	Mar. 31, 2016USD ($)
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	$ 31,270
Fair value after 1 year through 5 years	34,190
Fair value	65,460
Amortized cost within 1 year	31,263
Amortized cost after 1 year through 5 years	34,148
Amortized cost	65,411
Corporate Debt Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	23,376
Fair value after 1 year through 5 years	22,135
Fair value	45,511
Commercial Paper
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	4,890
Fair value	4,890
U S Treasury Securities
Schedule Of Available For Sale Securities [Line Items]
Fair value within 1 year	3,004
Fair value after 1 year through 5 years	9,547
Fair value	12,551
Agency Bonds
Schedule Of Available For Sale Securities [Line Items]
Fair value after 1 year through 5 years	2,508
Fair value	$ 2,508

Fair Value of Assets and Liab45

Fair Value of Assets and Liabilities - Fair Value Hierarchy for Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Assets:
Borrower Loans	$ 303,243	$ 297,273
Loans Held for Sale	30	32
Available for Sale Investments, at Fair Value	67,958	73,187
Servicing Assets	15,548	14,363
Total Assets	386,779	384,855
Liabilities:
Notes	302,357	297,405
Servicing Liabilities	398	484
Contingent Consideration	4,866	4,801
Total Liabilities	307,621	302,690
Prosper Funding LLC [Member]
Assets:
Borrower Loans	303,243	297,273
Loans Held for Sale	30	32
Servicing Assets	14,929	13,605
Total Assets	318,202	310,910
Liabilities:
Notes	302,357	297,405
Servicing Liabilities	398	484
Total Liabilities	302,755	297,889
Level 2 Inputs [Member]
Assets:
Available for Sale Investments, at Fair Value	67,958	73,187
Total Assets	67,958	73,187
Level 3 Inputs [Member]
Assets:
Borrower Loans	303,243	297,273
Loans Held for Sale	30	32
Servicing Assets	15,548	14,363
Total Assets	318,821	311,668
Liabilities:
Notes	302,357	297,405
Servicing Liabilities	398	484
Contingent Consideration	4,866	4,801
Total Liabilities	307,621	302,690
Level 3 Inputs [Member] | Prosper Funding LLC [Member]
Assets:
Borrower Loans	303,243	297,273
Loans Held for Sale	30	32
Servicing Assets	14,929	13,605
Total Assets	318,202	310,910
Liabilities:
Notes	302,357	297,405
Servicing Liabilities	398	484
Total Liabilities	$ 302,755	$ 297,889

Fair Value of Assets and Liab46

Fair Value of Assets and Liabilities - Borrower Loans, Loans Held For Sale and Notes - Quantitative Information about the Significant Unobservable Inputs (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Minimum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	4.30%	4.30%
Default rate	1.50%	1.40%
Minimum [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	4.30%	4.30%
Default rate	1.50%	1.40%
Maximum [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	14.60%	14.50%
Default rate	15.10%	14.40%
Maximum [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	14.60%	14.50%
Default rate	15.10%	14.40%

Fair Value of Assets and Liab47

Fair Value of Assets and Liabilities - Servicing Rights - Quantitative Information about the Significant Unobservable Inputs (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 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	15.70%	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	15.70%	14.30%
Maximum [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	25.00%	25.00%
Default rate	15.30%	14.70%
Prepayment rate	51.60%	25.60%
Maximum [Member] | Prosper Funding LLC [Member]
Servicing Assets And Liabilities Fair Value [Line Items]
Discount rate	25.00%	25.00%
Default rate	15.30%	14.70%
Prepayment rate	51.60%	25.60%

Fair Value of Assets and Liab48

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
	Mar. 31, 2016	Mar. 31, 2015
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	$ (100)	$ 7,923
Purchase of Borrower Loans/Issuance of Notes, Total	931,318	540,842
Principal repayments, Total	1,072	(358)
Borrower Loans sold to third parties, Total	(931,449)	(547,309)
Other changes, Total	153	205
Change in fair value, Total	(78)	(101)
Ending balance, Total	916	1,202
Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Total	(100)	7,923
Originations, Total	931,318	540,842
Principal repayments, Total	1,072	(358)
Borrower Loans sold to third parties, Total	(931,449)	(547,309)
Other changes, Total	153	205
Change in fair value, Total	(78)	(101)
Ending balance, Total	916
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		1,202
Notes [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	(297,405)	(273,783)
Purchase of Borrower Loans/Issuance of Notes, Liabilities	(55,273)	(47,796)
Principal repayments, Liabilities	42,062	36,069
Borrower Loans sold to third parties, Liabilities	582
Other changes, Liabilities	157	207
Change in fair value, Liabilities	7,520	4,502
Ending balance, Liabilities	(302,357)	(280,801)
Notes [Member] | Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Liabilities	(297,405)	(273,783)
Originations, Liabilities	(55,273)	(47,796)
Principal repayments, Liabilities	42,062	36,069
Borrower Loans sold to third parties, Liabilities	582
Other changes, Liabilities	157	207
Change in fair value, Liabilities	7,520	4,502
Ending balance, Liabilities	(302,357)
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		(280,801)
Borrower Loans [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	297,273	273,243
Purchase of Borrower Loans/Issuance of Notes, Assets	55,171	47,714
Principal repayments, Assets	(40,986)	(36,063)
Borrower Loans sold to third parties, Assets	(613)
Other changes, Assets	(4)	6
Change in fair value, Assets	(7,598)	(4,496)
Ending balance, Assets	303,243	280,404
Borrower Loans [Member] | Prosper Funding LLC [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	297,273	273,243
Originations, Assets	55,171	47,714
Principal repayments, Assets	(40,986)	(36,063)
Borrower Loans sold to third parties, Assets	(613)
Other changes, Assets	(4)	6
Change in fair value, Assets	(7,598)	(4,496)
Ending balance, Assets	303,243
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		280,404
Loans Held for Sale [Member]
Changes in Level 3 assets measured at fair value on a recurring basis [Abstract]
Beginning balance, Assets	32	8,463
Purchase of Borrower Loans/Issuance of Notes, Assets	931,420	540,924
Principal repayments, Assets	(4)	(364)
Borrower Loans sold to third parties, Assets	(931,418)	(547,309)
Other changes, Assets		(8)
Change in fair value, Assets		(107)
Ending balance, Assets	30	1,599
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	32	8,463
Originations, Assets	931,420	540,924
Principal repayments, Assets	(4)	(364)
Borrower Loans sold to third parties, Assets	(931,418)	(547,309)
Other changes, Assets		(8)
Change in fair value, Assets		(107)
Ending balance, Assets	$ 30
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		$ 1,599

Fair Value of Assets and Liab49

Fair Value of Assets and Liabilities - Schedule of Servicing Assets and Liabilities Measured at Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 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	14,363	4,709
Additions	4,021	2,078
Less: Changes in fair value	(2,836)	(753)
Fair Value at end of period	15,548	6,034
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	13,605	3,515
Additions	4,021	2,078
Less: Transfers to PMI		(249)
Less: Changes in fair value	(2,697)	(562)
Fair Value at end of period	14,929	4,782
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	484	595
Additions	9	154
Less: Changes in fair value	(95)	(81)
Fair value at end of the period	398	668
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	484	595
Additions	9	154
Less: Changes in fair value	(95)	(81)
Fair value at end of the period	$ 398	$ 668

Fair Value of Assets and Liab50

Fair Value of Assets and Liabilities - Additional Information (Details) - USD ($) $ in Thousands	Oct. 09, 2015	Mar. 31, 2016	Dec. 31, 2015
Fair Value Balance Sheet Grouping Financial Statement Captions [Line Items]
Contingent Consideration		$ 4,866	$ 4,801
Changes in fair value		$ 100
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 Liab51

Fair Value of Assets and Liabilities - Fair Value Assumptions for Borrower Loans, Loans Held for Sale and Notes (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2016USD ($)
Discount rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.98%
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	6.98%
Discount rate assumption [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.98%
Discount rate assumption [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Discount rate	6.98%
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	$ 300,134
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	300,134
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	299,252
Discount rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	299,252
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	297,104
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	297,104
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	296,225
Discount rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	296,225
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	306,433
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	306,433
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	305,543
Discount rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	305,543
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	309,709
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	309,709
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	308,815
Discount rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	$ 308,815
Default rate assumption [Member] | Borrower Loans and Loans Held for Sale [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	10.87%
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	10.87%
Default rate assumption [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	10.87%
Default rate assumption [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Default rate	10.87%
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	$ 300,206
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	300,206
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	299,315
Default rate assumption [Member] | 100 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	299,315
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	297,240
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	297,240
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	296,345
Default rate assumption [Member] | 200 Basis Point Increase [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	296,345
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	306,305
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	306,305
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	305,423
Default rate assumption [Member] | 100 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	305,423
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	309,402
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	309,402
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	308,526
Default rate assumption [Member] | 200 Basis Point Decrease [Member] | Notes [Member] | Prosper Funding LLC [Member]
Fair Value Inputs Assets Quantitative Information [Line Items]
Notes	$ 308,526

Fair Value of Assets and Liab52

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	3 Months Ended	12 Months Ended
	Mar. 31, 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%	$ 14,419
Market servicing rate decrease to 0.60%	$ 16,677
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
Weighted average prepayment assumptions	21.35%
Resulting fair value from:
Market servicing rate increase to 0.65%	$ 14,419
Market servicing rate decrease to 0.60%	$ 16,677
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
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%	$ 14,049
Market servicing rate decrease to 0.60%	$ 16,250
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
Weighted average prepayment assumptions	21.35%
Resulting fair value from:
Market servicing rate increase to 0.65%	$ 14,049
Market servicing rate decrease to 0.60%	$ 16,250
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
Servicing liabilities [Member]
Resulting fair value from:
Weighted average prepayment assumptions	21.35%
Market servicing rate increase to 0.65%	$ 439
Market servicing rate decrease to 0.60%	$ 358
Weighted average default assumptions	11.23%
Weighted average prepayment assumptions	21.35%
Market servicing rate assumptions	0.625%
Resulting fair value from:
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
Servicing liabilities [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Weighted average prepayment assumptions	21.35%
Market servicing rate increase to 0.65%	$ 439
Market servicing rate decrease to 0.60%	$ 358
Weighted average default assumptions	11.23%
Weighted average prepayment assumptions	21.35%
Market servicing rate assumptions	0.625%
Resulting fair value from:
Weighted average prepayment assumptions	21.35%
Weighted average default assumptions	11.23%
Prepayment 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	$ 15,152
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%	14,632
Resulting fair value from:
Market servicing rate increase to 0.65%	14,632
Prepayment rate assumption [Member] | Servicing assets [Member] | 0.9 Multiplier Default Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	15,771
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%	15,230
Resulting fair value from:
Market servicing rate decrease to 0.60%	15,230
Prepayment 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	376
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	376
Applying a 0.9 multiplier to default rate	392
Prepayment rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Default Rate [Member]
Resulting fair value from:
Applying a 0.9 multiplier to default rate	392
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	15,314
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	14,704
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	15,785
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	15,156
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	398
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	399
Default rate assumption [Member] | Servicing liabilities [Member] | 0.9 Multiplier Default Rate [Member] | Prosper Funding LLC [Member]
Resulting fair value from:
Applying a 1.1 multiplier to default rate	398
Applying a 0.9 multiplier to default rate	$ 399

Fair Value of Assets and Liab53

Fair Value of Assets and Liabilities - Schedule of Prosper's and Prosper Funding's Estimated Fair Value of Servicing Assets and Liabilities (Parenthetical) (Details)	3 Months Ended
	Mar. 31, 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)	3 Months Ended
	Mar. 31, 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 Intangible55

Goodwill And Other Intangible Assets - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Goodwill And Other Intangible Assets [Line Items]
Goodwill	$ 36,368,000		$ 36,368,000
Goodwill impairment expense	0
Intangible assets	12,083,000		$ 13,051,000
Amortization of intangible assets	$ 1,000,000	$ 100,000
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 amortized period	4 years 6 months
Intangible assets	$ 7,246,000
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 Intangible56

Goodwill And Other Intangible Assets - Summary of Other Intangible for the Periods Presented (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 14,620
Accumulated Amortization	(2,537)
Net Carrying Value	12,083	$ 13,051
User Base and Customer Relationships [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	6,250
Accumulated Amortization	(1,413)
Net Carrying Value	$ 4,837
Remaining Useful Life (In Years)	8 years 9 months 18 days
Developed Technology [Member]
Finite Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 8,310
Accumulated Amortization	(1,064)
Net Carrying Value	$ 7,246
Remaining Useful Life (In Years)	4 years 6 months
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 Intangible57

Goodwill And Other Intangible Assets - Summary of Estimated Amortization of Purchased Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Finite Lived Intangible Assets Future Amortization Expense Current And Five Succeeding Fiscal Years [Abstract]
2,016	$ 2,869
2,017	3,260
2,018	2,329
2,019	1,779
2,020	1,344
Thereafter	502
Net Carrying Value	$ 12,083	$ 13,051

Other Liabilities - Schedule of

Other Liabilities - Schedule of Other Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Other Liabilities [Abstract]
Class action settlement liability	$ 2,961	$ 5,949
Repurchase liability for unvested restricted stock awards	350	473
Contingent consideration	4,866	4,801
Deferred revenue	450	1,591
Servicing liabilities	398	484
Deferred rent	5,341	5,240
Other	1,908	2,197
Total Other Liabilities	$ 16,274	$ 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
	Mar. 31, 2016	Mar. 31, 2015
Numerator [Abstract]
Net loss available to common stockholders for basic and diluted EPS	$ (17,464)	$ (7,276)
Denominator [Abstract]
Weighted average shares used in computing basic and diluted net loss per share	60,357,488	52,766,255
Basic and diluted net loss per share	$ (0.29)	$ (0.14)

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
	Mar. 31, 2016	Mar. 31, 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)	227,088,744	207,955,100
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	153,499,785
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)	39,088,308	35,193,640
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)	7,694,370	18,635,210
Restricted Stock Units [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)	2,380,956
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)	536,685	626,465

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 a62

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	Mar. 31, 2016	Feb. 29, 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 a63

Convertible Preferred Stock and Stockholders' Deficit - Additional Information (Details) $ / shares in Units, $ in Thousands	Feb. 16, 2016	Mar. 31, 2016USD ($)$ / sharesshares	Feb. 29, 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)			464,214,500
Common stock, shares authorized (in shares)		286,826,075	286,826,075	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)		70,629,640		70,367,425
Common stock, shares outstanding (in shares)		69,693,705		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)		281,820
Proceeds from Exercise of Vested Stock Options | $		$ 240
Unvested restricted stock outstanding (in shares)		7,694,370		9,806,170
Stock repurchase upon termination of employment (in shares)		39,435
Aggregate price for repurchase of common stock | $		$ 46
Warrants [Member]
Class of Stock [Line Items]
Shares issued (in shares)		19,830
Exercise of warrants aggregate proceeds | $		$ 9

Shared Based Incentive Plan a64

Shared Based Incentive Plan and Compensation - Additional Information (Details)	Feb. 16, 2016	Mar. 31, 2016USD ($)shares	Mar. 31, 2015USD ($)
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.
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.
Options Issued and Outstanding, Options granted		0
Unrecognized cost of unvested share-based compensation awards. | $		$ 0
Unamortized expense related to unvested stock-based awards | $		$ 49,100,000
Remaining weighted average vesting period		3 years
Internal-use Software and Website Development Costs [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-Based Compensation, capitalized amount | $		$ 210,000	$ 122,000
Restricted Stock Unit (RSUs) [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Aggregate fair value | $		$ 12,900,000
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)		69,433,425
Options Issued and Outstanding, Options granted		0
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		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)		30,409,945
Shares available for grant under the plan		17,015,710

Shared Based Incentive Plan a65

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]	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Early exercised options, unvested [Roll Forward]
Beginning balance | shares	9,806,170
Repurchase of restricted stock | shares	(39,435)
Restricted stock vested | shares	(2,072,365)
Ending balance | shares	7,694,370
Weighted average exercise price [Abstract]
Weighted-Average Exercise Price, Beginning balance | $ / shares	$ 0.05
Repurchase of restricted stock | $ / shares	1.16
Restricted stock vested | $ / shares	0.04
Weighted-Average Exercise Price, Ending balance | $ / shares	$ 0.05

Shared Based Incentive Plan a66

Shared Based Incentive Plan and Compensation - Additional Information Regarding Unvested Early exercised stock options outstanding (Details)	3 Months Ended
	Mar. 31, 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	7,108,965
Weighted Avg. Remaining Life	10 months 24 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	446,930
Weighted Avg. Remaining Life	1 year 10 months 24 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	138,475
Weighted Avg. Remaining Life	2 years 3 months 18 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	7,694,370
Weighted Avg. Remaining Life	1 year
Weighted Avg. Exercise Price	$ 0.04

Shared Based Incentive Plan a67

Shared Based Incentive Plan and Compensation - Summarized Option Activity under Option Plan (Details) - 2005 Stock Plan and 2015 Stock Option Plan [Member]	3 Months Ended
	Mar. 31, 2016$ / sharesshares
Options Issued and Outstanding [Roll Forward]
Options Issued and Outstanding, Beginning Balance | shares	40,425,605
Options Issued and Outstanding, Options exercised - vested | shares	(281,820)
Options Issued and Outstanding, Options forfeited | shares	(1,242,430)
Options Issued and Outstanding, Ending balance | shares	38,901,355
Options Issued and Outstanding, Options vested and/or exercisable at March 31, 2016 | shares	27,461,505
Weighted-Average Exercise Price [Roll Forward]
Weighted-Average Exercise Price, Beginning balance | $ / shares	$ 2.64
Weighted-Average Exercise Price, Options exercised - vested | $ / shares	0.86
Weighted-Average Exercise Price, Options forfeited | $ / shares	3.98
Weighted-Average Exercise Price, Ending balance | $ / shares	2.61
Weighted-Average Exercise Price, Options vested and/or exercisable at March 31, 2016 | $ / shares	$ 1.67

Shared Based Incentive Plan a68

Shared Based Incentive Plan and Compensation - Additional Information Regarding Common Stock Options Outstanding (Details) - Stock Options Issued and Outstanding [Member]	3 Months Ended
	Mar. 31, 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	13,514,280
Weighted Avg. Remaining Life	7 years 7 months 24 days
Weighted Avg. Exercise Price	$ 0.12
Number Exercisable | shares	13,511,425
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	4,370,570
Weighted Avg. Remaining Life	8 years 3 months 26 days
Weighted Avg. Exercise Price	$ 1.13
Number Exercisable | shares	2,701,235
Weighted-Avg. Exercise Price	$ 1.13
$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	11,000,095
Weighted Avg. Remaining Life	8 years 10 months 17 days
Weighted Avg. Exercise Price	$ 3.62
Number Exercisable | shares	11,000,095
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	10,016,410
Weighted Avg. Remaining Life	9 years 5 months 23 days
Weighted Avg. Exercise Price	$ 5.50
Number Exercisable | shares	248,750
Weighted-Avg. Exercise Price	$ 5.45
$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	38,901,355
Weighted Avg. Remaining Life	8 years 6 months 18 days
Weighted Avg. Exercise Price	$ 2.61
Number Exercisable | shares	27,461,505
Weighted-Avg. Exercise Price	$ 1.67

Shared Based Incentive Plan a69

Shared Based Incentive Plan and Compensation - Fair Value of Stock Option Awards (Details)	3 Months Ended
	Mar. 31, 2015
Fair value of stock option awards [Abstract]
Volatility of common stock	55.59%
Risk-free interest rate	1.61%
Expected life	5 years 8 months 12 days
Dividend yield	0.00%

Shared Based Incentive Plan a70

Shared Based Incentive Plan and Compensation - Summarized Activities for the Company's RSU's (Details) - Restricted Stock Unit (RSUs) [Member]	3 Months Ended
	Mar. 31, 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	2,661,255
Forfeited | shares	(6,750)
Restricted stock unit ,Unvested ,Ending Balance | shares	4,490,015
Unvested | $ / shares	$ 5.52
Granted | $ / shares	2.14
Forfeited | $ / shares	2.14
Unvested | $ / shares	$ 2.86

Shared Based Incentive Plan a71

Shared Based Incentive Plan and Compensation - Stock Based Compensation Included in Consolidated Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$ 5,107	$ 1,439
Origination and Servicing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	439	144
Sales and Marketing [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	736	388
General and Administrative [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock based compensation	$ 3,932	$ 907

Income Taxes - Additional Infor

Income Taxes - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Income Taxes [Line Items]
Income Tax Expense	$ 165,000	$ 73,000
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			12 Months Ended
	Jun. 30, 2016USD ($)	Mar. 31, 2016USD ($)Installment	Mar. 31, 2015USD ($)Installment	Dec. 31, 2015USD ($)	Dec. 31, 2014USD ($)	Dec. 31, 2016USD ($)	Oct. 16, 2008USD ($)
Commitments And Contingencies [Line Items]
Rental expense under operating lease arrangements		$ 1,800,000	$ 800,000
Maximum potential future payments		4,219,000,000
Accrued repurchase and indemnification obligation		346,000		$ 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		4	3
Other commitment paid				2,000,000	$ 2,000,000
Settlement installment due in 2016		$ 3,000,000
Settlement installment due in 2017		3,000,000
Class action settlement liability		2,961,000		5,949,000
Prosper Funding LLC [Member]
Commitments And Contingencies [Line Items]
Maximum potential future payments		4,033,000,000
Accrued repurchase and indemnification obligation		$ 296,000		$ 460,000
Scenario, Forecast [Member]
Commitments And Contingencies [Line Items]
Minimum annual fee						$ 1,400,000
Purchase of borrower loans	$ 17,000,000
Scenario, Forecast [Member] | Prosper Funding LLC [Member]
Commitments And Contingencies [Line Items]
Minimum annual fee						$ 1,400,000
Purchase of borrower loans	$ 17,000,000
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 Contingencies74

Commitments and Contingencies - Future Minimum Lease Payments (Details) $ in Thousands	Mar. 31, 2016USD ($)
Operating Leases Future Minimum Payments Due [Abstract]
Remaining nine months of 2016	$ 5,104
2,017	9,643
2,018	10,510
2,019	10,739
2,020	11,253
2,021	11,364
Thereafter	32,173
Total future operating lease obligations	$ 90,786

Related Parties - Additional In

Related Parties - Additional Information (Details)	3 Months Ended
	Mar. 31, 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
	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	$ 641	$ 489
Interest earned on Notes	55	49
Notes balance	2,449		$ 2,237
Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	405	479
Interest earned on Notes	49	47
Notes balance	1,980		1,912
Executive Officers & Management [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	405	479
Interest earned on Notes	49	47
Notes balance	1,980		1,912
Executive Officers & Management [Member] | Prosper Funding LLC [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	405	479
Interest earned on Notes	49	47
Notes balance	1,980		1,912
Directors [Member]
Related Party Transaction [Line Items]
Aggregate amount of notes purchased	236	10
Interest earned on Notes	6	$ 2
Notes balance	$ 469		$ 325

Subsequent Events (Details)

Subsequent Events (Details) $ in Millions	6 Months Ended
	Sep. 30, 2016USD ($)	May. 03, 2016Employee
Scenario, Forecast [Member]
Subsequent Event [Line Items]
Expected employee severance and benefits charges | $	$ 5.9
Subsequent Event [Member] | Salt Lake City, Utah [Member]
Subsequent Event [Line Items]
Number of employees expected to be terminated or relocated due to restructuring		97
Subsequent Event [Member] | San Francisco, California and Phoenix, Arizona [Member]
Subsequent Event [Line Items]
Number of employees expected to be terminated due to restructuring		73

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Prosper Funding LLC [Member]
Collaborative Arrangements And Noncollaborative Arrangement Transactions [Line Items]
Comprehensive income (loss)	$ 0	$ 0