LendingClub (LC) 10-Q 3 Nov 15 2015 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2015	Oct. 30, 2015
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2015
Document Fiscal Year Focus	2,015
Document Fiscal Period Focus	Q3
Trading Symbol	ck0001409970
Entity Registrant Name	LENDINGCLUB CORP
Entity Central Index Key	1,409,970
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		377,863,378

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Assets
Cash and cash equivalents	$ 579,206	$ 869,780
Restricted cash	159,216	46,763
Securities available for sale:	338,519	0
Loans at fair value (includes $2,639,651 and $1,772,407 from consolidated trust, respectively)	4,068,974	2,798,505
Accrued interest receivable (includes $22,790 and $15,209 from consolidated trust, respectively)	36,544	24,262
Property, equipment and software, net	47,096	27,051
Intangible assets, net	32,227	36,302
Goodwill	72,683	72,592
Due from related parties	606	467
Other assets	24,679	14,332
Total assets	5,359,750	3,890,054
Liabilities and Stockholders’ Equity
Accounts payable	3,756	5,892
Accrued interest payable (includes $25,868 and $16,989 from consolidated trust, respectively)	39,858	26,964
Accrued expenses and other liabilities	54,137	31,620
Payables to investors	150,880	38,741
Notes and certificates at fair value (includes $2,656,917 and $1,772,407 from consolidated trust, respectively)	4,095,481	2,813,618
Total liabilities	4,344,112	2,916,835
Stockholders’ Equity
Common stock, $0.01 par value; 900,000,000 shares authorized at September 30, 2015 and December 31, 2014, respectively; 377,289,733 and 371,443,916 shares issued and outstanding at September 30, 2015 and December 31, 2014, respectively	3,773	3,714
Additional paid-in capital	1,105,824	1,052,728
Accumulated deficit	(92,787)	(83,223)
Accumulated other comprehensive loss	(1,172)	0
Total stockholders’ equity	1,015,638	973,219
Total liabilities and stockholders’ equity	$ 5,359,750	$ 3,890,054

Condensed Consolidated Balance3

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Member Loans at fair value	$ 4,068,974	$ 2,798,505
Accrued interest receivable from consolidated Trust	36,544	24,262
Accrued interest payable from consolidated Trust	39,858	26,964
Notes and certificates, at fair value from consolidated Trust	$ 4,095,481	$ 2,813,618
Common stock, par value ($ per share)	$ 0.01	$ 0.01
Common stock, shares authorized	900,000,000	900,000,000
Common stock, shares issued	377,289,733	371,443,916
Common stock, shares outstanding	377,289,733	371,443,916
Consolidated Trust
Member Loans at fair value	$ 2,639,651	$ 1,772,407
Accrued interest receivable from consolidated Trust	22,790	15,209
Accrued interest payable from consolidated Trust	25,868	16,989
Notes and certificates, at fair value from consolidated Trust	$ 2,656,917	$ 1,772,407

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Operating revenue:
Transaction fees	$ 100,420	$ 52,622	$ 258,553	$ 133,835
Servicing fees	8,999	3,053	20,870	6,301
Management fees	2,900	1,608	7,663	4,163
Other revenue (expense)	2,743	(745)	5,140	(438)
Total operating revenue	115,062	56,538	292,226	143,861
Net interest income (expense):
Total interest income	145,833	94,038	389,831	252,298
Total interest expense	(144,659)	(94,460)	(387,666)	(253,054)
Net interest income (expense)	1,174	(422)	2,165	(756)
Fair value adjustments, loans	(72,474)	(33,809)	(172,495)	(84,963)
Fair value adjustments, notes and certificates	72,514	33,757	172,529	84,865
Net interest income (expense) after fair value adjustments	1,214	(474)	2,199	(854)
Total net revenue	116,276	56,064	294,425	143,007
Operating expenses:
Sales and marketing	44,961	21,001	120,162	60,808
Origination and servicing	17,573	10,167	45,540	26,135
General and administrative	51,559	31,848	136,038	78,862
Total operating expenses	114,093	63,016	301,740	165,805
Income (loss) before income tax expense	2,183	(6,952)	(7,315)	(22,798)
Income tax expense	1,233	419	2,249	1,059
Net income (loss)	$ 950	$ (7,371)	$ (9,564)	$ (23,857)
Basic net income (loss) per share attributable to common stockholders ($ per share)	$ 0	$ (0.12)	$ (0.03)	$ (0.41)
Diluted net income (loss) per share attributable to common stockholders ($ per share)	$ 0	$ (0.12)	$ (0.03)	$ (0.41)
Weighted-average shares of common stock used in computing basic net income (loss) per share (shares)	375,982,120	59,844,394	373,605,274	57,958,838
Weighted-average shares of common stock used in computing diluted net income (loss) per share (shares)	401,934,880	59,844,394	373,605,274	57,958,838

Condensed Consolidated Stateme5

Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss) (1)	$ 950	$ (7,371)	$ (9,564)	$ (23,857)
Other Comprehensive Income (Loss), before Tax [Abstract]
Change in net unrealized loss on securities available for sale	(341)	0	(1,172)	0
Other comprehensive loss, before tax	(341)	0	(1,172)	0
Income tax effect	0	0	0	0
Other comprehensive loss, net of tax	(341)	0	(1,172)	0
Comprehensive income (loss)	$ 609	$ (7,371)	$ (10,736)	$ (23,857)

Condensed Consolidated Stateme6

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash Flows from Operating Activities:
Net income (loss) (1)	$ (9,564)	$ (23,857)
Adjustments to reconcile net loss to net cash provided by operating activities:
Net fair value adjustments of loans, notes and certificates	(33)	99
Change in fair value of loan servicing liabilities	(3,919)	2,776
Change in fair value of loan servicing assets	2,467	(986)
Stock-based compensation, net	37,558	25,889
Depreciation and amortization	15,525	6,620
(Gain) loss on sales of loans	(2,136)	2,110
Other, net	42	450
Purchase of whole loans to be sold	(2,338,346)	(1,096,592)
Proceeds from sales of whole loans	2,338,346	1,094,482
Net change in operating assets and liabilities:
Accrued interest receivable	(12,282)	(6,373)
Other assets	(6,341)	13,184
Due from related parties	(139)	(88)
Accounts payable	(3,071)	(1,107)
Accrued interest payable	12,893	7,982
Accrued expenses and other liabilities	22,350	10,806
Net cash provided by operating activities	53,350	35,395
Cash Flows from Investing Activities:
Purchases of loans	(2,736,698)	(1,534,276)
Principal payments received from loans	1,280,005	739,505
Proceeds from recoveries and sales of charged-off loans	13,729	5,178
Purchases of securities available for sale	(402,832)	0
Proceeds from sales of securities available for sale	63,198	0
Payments for business acquisition, net of cash acquired	0	(109,464)
Net change in restricted cash	(112,453)	(11,432)
Proceeds from sale of property and equipment	11	0
Purchases of property, equipment and software	(25,878)	(14,989)
Net cash used for investing activities	(1,920,918)	(925,478)
Cash Flows from Financing Activities:
Change in payable to investors	112,139	12,933
Proceeds from issuances of notes and certificates	2,736,667	1,534,010
Principal payments on notes and certificates	(1,268,622)	(732,342)
Payments on notes and certificates from recoveries/sales of related charged-off loans	(13,654)	(5,153)
Proceeds from term loan, net of debt discount	0	49,813
Payment for debt issuance cost	0	(1,192)
Principal payment on term loan	0	(625)
Prepaid offering costs	0	(1,887)
Change in equity offering costs	90	0
Proceeds from issuance of common stock for ESPP	2,694	0
Proceeds from stock option exercises and other	7,680	3,098
Net cash provided by financing activities	1,576,994	923,458
Net (Decrease) Increase in Cash and Cash Equivalents	(290,574)	33,375
Cash and Cash Equivalents, Beginning of Period	869,780	49,299
Cash and Cash Equivalents, End of Period	579,206	82,674
Supplemental Cash Flow Information:
Cash paid for interest	374,760	244,531
Issuance of Series F convertible preferred stock for business acquisition	0	2,762
Accruals for property, equipment and software	3,466	1,132
Series F Preferred Stock
Cash Flows from Financing Activities:
Proceeds from issuance of Series F convertible preferred stock, net of issuance costs	$ 0	$ 64,803

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2015
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Basis of Presentation	Basis of Presentation LendingClub Corporation (Lending Club) is an online marketplace connecting borrowers and investors. LC Advisors, LLC (LCA), is a registered investment advisor with the Securities and Exchange Commission (SEC) and wholly-owned subsidiary of Lending Club that acts as the general partner for certain private funds and advisor to separately managed accounts. Springstone Financial, LLC (Springstone), is a wholly-owned subsidiary of Lending Club that facilitates education and patient finance loans. LC Trust I (the Trust) is an independent Delaware business trust that acquires and holds loans from Lending Club for the sole benefit of certain investors that purchase trust certificates (Certificates) issued by the Trust and that are related to underlying loans. The accompanying unaudited condensed consolidated financial statements include Lending Club, the Trust, LCA and Springstone (collectively referred to as the Company, we, or us). All intercompany balances and transactions have been eliminated. These condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP) for interim financial information necessary for the fair statement of the results and financial position for the periods presented. The Company's results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year or any other interim period. The accompanying interim condensed consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (Annual Report). The Company's significant accounting policies are included in " Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 – Summary of Significant Accounting Policies " in the Annual Report. There have been no significant changes to these accounting policies during the first nine months of 2015, except as noted in " Note 4 – Securities Available for Sale " and " Note 6 – Fair Value of Assets and Liabilities " of these condensed consolidated financial statements.

New Accounting Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
New Accounting Standards	New Accounting Standards New Accounting Standards Not Yet Adopted In February 2015, the Financial Accounting Standards Board (FASB) issued new guidance amending accounting for consolidations, which will be effective January 1, 2016. The guidance changes what an investor must consider in determining whether it is required to consolidate an entity in which it holds an interest. The Company is currently evaluating the impact of this guidance on the Company’s financial position, results of operations, earnings per common share, and cash flows. In April 2015, the FASB issued new guidance amending accounting for customer's cloud based fees, which will be effective January 1, 2016. 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. The Company is currently evaluating the impact of this guidance on the Company’s financial position, results of operations, earnings per common share, and cash flows. In September 2015, the FASB amended existing guidance related to recognition of adjustments to provisional amounts recorded during purchase accounting. Changes recognized during the measurement period will be recognized prospectively as adjustments to goodwill, with corresponding changes in income or expense, such as revised depreciation or amortization, recognized in current period earnings. This amendment is effective January 1, 2016. Since we do not currently have any open measurement periods related to any business acquisition, adoption of this standard will not have an impact on the Company's financial position, results of operations, earnings per common share, or cash flows.

Net Income (Loss) Per Share and

Net Income (Loss) Per Share and Net Income (Loss) Attributable to Common Stockholders	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Net Income (Loss) Per Share and Net Income (Loss) Attributable to Common Stockholders	Net Income (Loss) Per Share and Net Income (Loss) Attributable to Common Stockholders Earnings (loss) per share (EPS) is the amount of net income (loss) available to each share of common stock outstanding during the reporting period. Diluted EPS is the amount of net income (loss) available to each share of common stock outstanding during the reporting period, adjusted to include the effect of potentially dilutive common shares. Potentially dilutive common shares are excluded from the computation of diluted EPS in periods in which the effect would be antidilutive. Potentially dilutive common shares include incremental shares issued for stock options, convertible preferred stock and warrants to purchase common stock. In conjunction with the Company's Initial Public Offering (IPO) on December 11, 2014, all of its convertible preferred stock converted to common stock and all warrants to purchase convertible preferred stock were converted to warrants to purchase common stock. The Company calculates EPS using the two-class method when applicable. The two-class method allocates net income that otherwise would have been available to common shareholders to holders of participating securities. All participating securities are excluded from basic weighted-average common shares outstanding. Prior to the Company's IPO, the Company considered all series of its convertible preferred stock to be participating securities. The Company had no participating securities as of September 30, 2015 . The following table details the computation of the basic and diluted net income (loss) per share: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Net income (loss) (1) $ 950 $ (7,371 ) $ (9,564 ) $ (23,857 ) Weighted average common shares - Basic 375,982,120 59,844,394 373,605,274 57,958,838 Weighted average common shares - Diluted 401,934,880 59,844,394 373,605,274 57,958,838 Basic net income (loss) per share attributable to common stockholders $ 0.00 $ (0.12 ) $ (0.03 ) $ (0.41 ) Diluted net income (loss) per share attributable to common stockholders $ 0.00 $ (0.12 ) $ (0.03 ) $ (0.41 ) (1) Also represents net income (loss) available to common stockholders. In a period with net income, both earnings and dividends (if any) are allocated to participating securities. In a period with a net loss, only declared dividends (if any) are allocated to participating securities. There were no dividends declared in the first nine months of 2015 or 2014 .

Securities Available for Sale

Securities Available for Sale	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Securities Available for Sale	Securities Available for Sale The Company began purchasing securities available for sale during the second quarter of 2015. Securities available for sale 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 a security is other-than-temporarily impaired (OTTI). Realized gains and losses from sales of securities available for sale are determined on a specific identification basis and are included in other revenue (expense). The amortized cost, gross unrealized gains and losses, and fair value of securities available for sale as of September 30, 2015 , are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate debt securities $ 251,253 $ 4 $ (1,144 ) $ 250,113 Asset-backed securities 54,990 4 (35 ) 54,959 U.S. agency securities 20,602 5 (4 ) 20,603 Municipal securities 5,840 3 — 5,843 Other securities 7,006 1 (6 ) 7,001 Total securities available for sale $ 339,691 $ 17 $ (1,189 ) $ 338,519 A summary of securities available for sale with unrealized losses as of September 30, 2015 , 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 Corporate debt securities $ 241,480 $ (1,144 ) $ — $ — $ 241,480 $ (1,144 ) Asset-backed securities 49,955 (35 ) — — 49,955 (35 ) U.S. agency securities 11,600 (4 ) — — 11,600 (4 ) Other securities 4,999 (6 ) — — 4,999 (6 ) Total securities with unrealized losses (1) $ 308,034 $ (1,189 ) $ — $ — $ 308,034 $ (1,189 ) (1) The number of investment positions with unrealized losses totaled 142 . Management evaluates whether securities available for sale are OTTI on a quarterly basis. Debt securities with unrealized losses are considered OTTI if the Company intends to sell the security or if it is more likely than not that it will be required to sell such security before any anticipated recovery. If management determines that a security is OTTI under these circumstances, the impairment recognized in earnings is measured as the entire difference between the amortized cost and then-current fair value. A security is also OTTI if management does not expect to recover all of the amortized cost of the security. In this circumstance, the impairment recognized in earnings represents estimated credit loss, and is measured by the difference between the present value of expected cash flows and the amortized cost of the security. Management utilizes cash flow models to estimate the expected future cash flow from the securities to estimate the credit loss when necessary. Expected cash flows are discounted using the security's effective interest rate. The evaluation of whether the Company expects to recover the amortized cost of a security is inherently judgmental. The evaluation includes the assessment of several security performance indicators, including the magnitude and duration of the unrealized loss and whether the Company has received all scheduled principal and interest payments. There were no impairment charges recognized during the first nine months of 2015. The contractual maturities of securities available for sale at September 30, 2015 , are as follows: Within 1 year After 1 year through 5 years After 5 years through 10 years After 10 years Total Corporate debt securities $ 28,120 $ 221,993 $ — $ — $ 250,113 Asset-backed securities — 54,959 — — 54,959 U.S. agency securities — 20,603 — — 20,603 Municipal securities — 5,843 — — 5,843 Other securities — 7,001 — — 7,001 Total fair value $ 28,120 $ 310,399 $ — $ — $ 338,519 Total amortized cost $ 28,151 $ 311,540 $ — $ — $ 339,691 Proceeds and gross realized gains and losses from sales of securities available for sale are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2015 Proceeds $ 59,689 $ 63,198 Gross realized gains $ 58 $ 58 Gross realized losses $ — $ 1

Loans, Notes and Certificates,

Loans, Notes and Certificates, and Loan Servicing Rights	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Loans, Notes and Certificates, and Loan Servicing Rights	Loans, Notes and Certificates, and Loan Servicing Rights Loans, Notes and Certificates At September 30, 2015 and December 31, 2014 , loans, notes and certificates measured at fair value on a recurring basis were as follows: Loans Notes and Certificates September 30, December 31, September 30, December 31, Aggregate principal balance outstanding $ 4,149,442 $ 2,836,729 $ 4,175,947 $ 2,851,837 Net fair value adjustments (80,468 ) (38,224 ) (80,466 ) (38,219 ) Fair value $ 4,068,974 $ 2,798,505 $ 4,095,481 $ 2,813,618 Original term 12 - 60 months 12 - 60 months Interest rates (fixed) 4.99% - 29.90% 5.79% - 29.90% Maturity dates ≤ September 2020 ≤ December 2019 We place loans on non-accrual status at the earlier of 120 days past due or when the Compay is notified that borrowers have filed for bankruptcy or are deceased. At September 30, 2015 and December 31, 2014 , loans that were 90 days or more past due (including non-accrual loans) were as follows: September 30, 2015 December 31, 2014 > 90 days past due Non-accrual loans (1) > 90 days past due Non-accrual loans (1) Outstanding principal balance $ 28,716 $ 1,174 $ 19,790 $ 1,373 Net fair value adjustments (27,102 ) (1,091 ) (18,825 ) (1,289 ) Fair value $ 1,614 $ 83 $ 965 $ 84 # of loans (not in thousands) 2,512 94 1,797 125 (1) Includes all loans for which the Company has been notified that the borrower has filed for bankruptcy or is deceased, or that were 120 days or more past due. Loan Servicing Rights Loan servicing assets and liabilities related to retained servicing rights are recorded at fair value in “Other assets” and “Accrued expenses and other liabilities,” respectively. At September 30, 2015 , loans underlying loan servicing rights had a total outstanding principal balance of $3.548 billion , original terms between 3 and 84 months , monthly payments with interest rates ranging from 2.99% to 33.15% and maturity dates through September 2022 . At December 31, 2014 , loans underlying loan servicing rights had a total outstanding principal balance of $1.872 billion , original terms between 12 and 60 months , monthly payments with fixed interest rates ranging from 5.90% to 33.15% and maturity dates through December 2019 .

Fair Value of Assets and Liabil

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Fair Value of Assets and Liabilities	Fair Value of Assets and Liabilities For a description of the fair value hierarchy and the Company’s fair value methodologies, see " Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 - Summary of Significant Accounting Policies " in the Annual Report. The Company did not transfer any assets or liabilities in or out of level 3 during the third quarter and first nine months of 2015 or the year ended December 31, 2014 . Financial Instruments Recorded at Fair Value See " Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 - Summary of Significant Accounting Policies " in the Company's Annual Report for a description of the fair value methodology for loans, notes and certificates. In the third quarter of 2015, the Company incorporated cumulative prepayments into the valuation of loans, notes and certificates to better reflect a market participant's view of valuation assumptions underlying unsecured consumer credit obligations. Prior to the third quarter, the effect of prepayments was reflected through an effective adjustment to the discount rates used in the fair value methodology. Cumulative prepayments are estimates of the cumulative amount of principal prepayments that will occur over the entire life of a loan expressed as a percentage of the original principal amount of the loan. The assumption regarding cumulative prepayments reduces the projected balances and expected terms of the loans, notes and certificates. When available, the Company uses quoted prices in active markets to measure the fair value of securities available for sale. When utilizing market data and bid-ask spreads, the Company uses the price within the bid-ask spread that best represents fair value. When quoted prices do not exist, the Company uses prices obtained from independent third-party pricing services to measure the fair value of securities available for sale. The Company'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 "to-be-issued" securities. The Company 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. The Company 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: September 30, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Loans $ — $ — $ 4,068,974 $ 4,068,974 Securities available for sale: Corporate debt securities — 250,113 — 250,113 Asset-backed securities — 54,959 — 54,959 U.S. agency securities — 20,603 — 20,603 Municipal securities — 5,843 — 5,843 Other securities — 7,001 — 7,001 Total securities available for sale — 338,519 — 338,519 Servicing assets — — 7,249 7,249 Total assets $ — $ 338,519 $ 4,076,223 $ 4,414,742 Liabilities: Notes and certificates $ — $ — $ 4,095,481 $ 4,095,481 Servicing liabilities — — 4,394 4,394 Total liabilities $ — $ — $ 4,099,875 $ 4,099,875 December 31, 2014 Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Loans $ — $ — $ 2,798,505 $ 2,798,505 Servicing assets — — 2,181 2,181 Total assets $ — $ — $ 2,800,686 $ 2,800,686 Liabilities: Notes and certificates $ — $ — $ 2,813,618 $ 2,813,618 Servicing liabilities — — 3,973 3,973 Total liabilities $ — $ — $ 2,817,591 $ 2,817,591 As our loans and related notes and certificates, and loan servicing rights do not trade in an active market with readily observable prices, we use 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 our level 3 fair value measurements at September 30, 2015 and December 31, 2014 : September 30, 2015 Range of Inputs Financial Instrument Unobservable Input Minimum Maximum Weighted- Average Loans, notes and certificates Discount rates 3.5 % 17.5 % 8.9 % Net cumulative expected loss rates 0.3 % 22.0 % 9.7 % Cumulative prepayment rates 21.9 % 38.5 % 27.7 % Servicing asset/liability Discount rates 3.5 % 20.5 % 9.6 % Net cumulative expected loss rates 0.3 % 21.5 % 8.7 % Cumulative prepayment rates 8.4 % 48.7 % 29.0 % Base market servicing rates (% per annum on unpaid principal balance) (1) 0.50 % 0.75 % 0.50 % December 31, 2014 Range of Inputs Financial Instrument Unobservable Input Minimum Maximum Weighted- Average Loans, notes and certificates Discount rates 5.2 % 17.4 % 10.1 % Net cumulative expected loss rates 0.3 % 22.0 % 10.0 % Servicing asset/liability Discount rates 5.3 % 23.7 % 10.7 % Net cumulative expected loss rates 0.3 % 22.0 % 10.2 % Cumulative prepayment rates 16.5 % 26.7 % 20.0 % Base market servicing rates (% per annum on unpaid principal balance) (1) 0.50 % 0.70 % 0.50 % (1) Excludes ancillary fees charged to investors that would be passed on to a third-party servicer. At September 30, 2015 , the discounted cash flow methodology used to estimate the notes and certificates fair values used the same projected cash flows as the related loans. As demonstrated in the following table, the fair value adjustments for loans were largely offset by the fair value adjustments of the notes and certificates due to the member payment dependent design of the notes and certificates and because the principal balances of the loans were very close to the combined principal balances of the notes and certificates. The following tables present additional information about level 3 loans, notes and certificates, each measured at fair value on a recurring basis, for the third quarters and first nine months of 2015 and 2014 : Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at June 30, 2015 $ 3,694,823 $ (57,440 ) $ 3,637,383 $ 3,717,556 $ (57,432 ) $ 3,660,124 Purchases of loans 1,946,455 — 1,946,455 — — — Issuances of notes and certificates — — — 991,926 — 991,926 Whole loan sales (954,770 ) — (954,770 ) — — — Principal payments (481,701 ) — (481,701 ) (478,189 ) — (478,189 ) Charge-offs (55,365 ) 55,365 — (55,346 ) 55,346 — Recoveries — (5,919 ) (5,919 ) — (5,867 ) (5,867 ) Change in fair value recorded in earnings — (72,474 ) (72,474 ) — (72,513 ) (72,513 ) Ending balance at September 30, 2015 $ 4,149,442 $ (80,468 ) $ 4,068,974 $ 4,175,947 $ (80,466 ) $ 4,095,481 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at June 30, 2014 $ 2,351,515 $ (25,313 ) $ 2,326,202 $ 2,361,902 $ (25,307 ) $ 2,336,595 Purchases of loans 994,497 — 994,497 — — — Issuances of notes and certificates — — — 532,034 — 532,034 Whole loan sales (462,523 ) — (462,523 ) — — — Principal payments (288,102 ) — (288,102 ) (280,643 ) — (280,643 ) Charge-offs (28,910 ) 28,910 — (28,852 ) 28,852 — Recoveries — (2,594 ) (2,594 ) — (2,589 ) (2,589 ) Change in fair value recorded in earnings — (33,809 ) (33,809 ) — (33,757 ) (33,757 ) Ending balance at September 30, 2014 $ 2,566,477 $ (32,806 ) $ 2,533,671 $ 2,584,441 $ (32,801 ) $ 2,551,640 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at December 31, 2014 $ 2,836,729 $ (38,224 ) $ 2,798,505 $ 2,851,837 $ (38,219 ) $ 2,813,618 Purchases of loans 5,075,044 — 5,075,044 — — — Issuances of notes and certificates — — — 2,736,667 — 2,736,667 Whole loan sales (2,338,346 ) — (2,338,346 ) — — — Principal payments (1,280,005 ) — (1,280,005 ) (1,268,622 ) — (1,268,622 ) Charge-offs (143,980 ) 143,980 — (143,935 ) 143,935 — Recoveries — (13,729 ) (13,729 ) — (13,653 ) (13,653 ) Change in fair value recorded in earnings — (172,495 ) (172,495 ) — (172,529 ) (172,529 ) Ending balance at September 30, 2015 $ 4,149,442 $ (80,468 ) $ 4,068,974 $ 4,175,947 $ (80,466 ) $ 4,095,481 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at December 31, 2013 $ 1,849,042 $ (20,000 ) $ 1,829,042 $ 1,859,982 $ (19,992 ) $ 1,839,990 Purchases of loans 2,628,758 — 2,628,758 — — — Issuances of notes and certificates — — — 1,534,011 — 1,534,011 Whole loan sales (1,094,482 ) — (1,094,482 ) — — — Principal payments (739,506 ) — (739,506 ) (732,343 ) — (732,343 ) Charge-offs (77,335 ) 77,335 — (77,209 ) 77,209 — Recoveries — (5,178 ) (5,178 ) — (5,153 ) (5,153 ) Change in fair value recorded in earnings — (84,963 ) (84,963 ) — (84,865 ) (84,865 ) Ending balance at September 30, 2014 $ 2,566,477 $ (32,806 ) $ 2,533,671 $ 2,584,441 $ (32,801 ) $ 2,551,640 The following table presents additional information about level 3 servicing assets and liabilities measured at fair value on a recurring basis for the third quarters and first nine months of 2015 and 2014 : Three Months Ended September 30, 2015 Three Months Ended September 30, 2014 Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Fair value at beginning of period $ 5,225 $ 4,831 $ 1,034 $ 2,736 Issuances (1) 3,092 1,402 481 1,809 Changes in fair value, included in servicing fees (1,436 ) (1,839 ) (182 ) (833 ) Additions, included in deferred revenue 368 — 187 — Fair value at end of period $ 7,249 $ 4,394 $ 1,520 $ 3,712 Nine Months Ended Nine Months Ended Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Fair value at beginning of period $ 2,181 $ 3,973 $ 534 $ 936 Issuances (1) 6,476 4,340 1,355 3,464 Changes in fair value, included in servicing fees (2,467 ) (3,919 ) (841 ) (688 ) Additions, included in deferred revenue 1,059 — 472 — Fair value at end of period $ 7,249 $ 4,394 $ 1,520 $ 3,712 (1) Represents the offsets to the gains or losses on sales of the related loans, recorded in other revenue (expense). Significant Recurring Level 3 Fair Value Asset and Liability Input Sensitivity Certain fair valuation adjustments recorded through earnings were related to level 3 instruments for the third quarters and first nine months of 2015 and 2014 . Generally, changes in the net cumulative expected loss rates, cumulative prepayment rates, and discount rates will have an immaterial net impact on the fair value of loans, notes and certificates, and servicing assets and liabilities. Certain of these unobservable inputs may (in isolation) have either a directionally consistent or opposite impact on the fair value of the financial instrument for a given change in that input. When multiple inputs are used within the valuation techniques for loans, notes and certificates, or servicing assets and liabilities, a change in one input in a certain direction may be offset by an opposite change from another input. A specific loan that is projected to have larger future default losses than previously estimated has lower expected future cash flows over its remaining life, which reduces its estimated fair value. Conversely, a specific loan that is projected to have smaller future default losses than previously estimated has increased expected future cash flows over its remaining life, which increases its fair value. Separately, an increase in expected prepayments will reduce the estimated fair value of a loan, whereas a decrease in expected prepayments will increase the estimated fair value of a loan. Our selection of the most representative base market servicing rates for servicing assets and servicing liabilities is inherently judgmental. We reviewed third-party servicing rates for our loans and loans in similar credit sectors, as well as a market servicing benchmarking analysis provided by a third-party valuation firm, and determined that base market servicing rates on our products ranging from 0.40% to 0.75% per anum of outstanding principal are reasonable estimates as of September 30, 2015 . The table below shows the estimated impact on the estimated fair value of servicing assets and liabilities, calculated using different base market servicing rate assumptions as of September 30, 2015 and December 31, 2014 : September 30, 2015 December 31, 2014 Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Weighted-average base market servicing rate assumptions 0.50 % 0.50 % 0.50 % 0.50 % Change in fair value from: Servicing rate increase to 0.60% $ (2,566 ) $ 1,764 $ (915 ) $ 1,416 Servicing rate decrease to 0.40% $ 2,682 $ (1,649 ) $ 965 $ (1,366 ) Financial Instruments Not Recorded at Fair Value The following tables present the fair value hierarchy for financial instruments not recorded at fair value: September 30, 2015 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and cash equivalents $ 579,206 $ — $ 579,206 $ — $ 579,206 Restricted cash 159,216 — 159,216 — 159,216 Deposits 763 — 763 — 763 Total assets $ 739,185 $ — $ 739,185 $ — $ 739,185 Liabilities: Accounts payable $ 3,756 $ — $ 3,756 $ — $ 3,756 Payables to investors 150,880 — 150,880 — 150,880 Total liabilities $ 154,636 $ — $ 154,636 $ — $ 154,636 December 31, 2014 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and cash equivalents $ 869,780 $ — $ 869,780 $ — $ 869,780 Restricted cash 46,763 — 46,763 — 46,763 Deposits 657 — 657 — 657 Total assets $ 917,200 $ — $ 917,200 $ — $ 917,200 Liabilities: Accounts payable $ 5,892 $ — $ 5,892 $ — $ 5,892 Payables to investors 38,741 — 38,741 — 38,741 Total liabilities $ 44,633 $ — $ 44,633 $ — $ 44,633

Property, Equipment and Softwar

Property, Equipment and Software, net	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Equipment and Software, Net	Property, Equipment and Software, Net Property, equipment and software, net, consist of the following: September 30, December 31, Internally developed software $ 34,107 $ 16,023 Computer equipment 12,169 7,929 Leasehold improvements 8,868 4,802 Purchased software 4,843 3,326 Furniture and fixtures 4,232 2,405 Construction in progress 2,165 549 Total property, equipment and software 66,384 35,034 Accumulated depreciation and amortization (19,288 ) (7,983 ) Total property, equipment and software, net $ 47,096 $ 27,051 Depreciation and amortization expense on property, equipment and software was $4.5 million and $1.8 million for the third quarters of 2015 and 2014 , respectively. Depreciation and amortization expense on property, equipment and software was $11.4 million and $4.1 million for the first nine months of 2015 and 2014 , respectively.

Other Assets

Other Assets	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	Other Assets Other assets consist of the following: September 30, December 31, Prepaid expenses $ 8,829 $ 6,807 Loan servicing assets at fair value 7,249 2,181 Accounts receivable 3,322 1,744 Deferred acquisition compensation 1,815 2,695 Deposits 763 657 Receivable from investors 568 155 Other 2,133 93 Total other assets $ 24,679 $ 14,332

Intangible Assets and Goodwill

Intangible Assets and Goodwill	9 Months Ended
	Sep. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	Intangible Assets and Goodwill Intangible Assets The Company's intangible asset balance was $32.2 million and $36.3 million at September 30, 2015 and December 31, 2014 , respectively. Amortization expense associated with intangible assets for the third quarter and first nine months of 2015 was $1.3 million and $4.1 million , respectively. Amortization expense associated with intangible assets for the third quarter and first nine months of 2014 was $1.4 million and $2.5 million , respectively. Goodwill The Company’s annual goodwill impairment testing date is April 1. In testing for potential impairment of goodwill on April 1, 2015, management performed an assessment of each of the Company’s goodwill reporting units (generally defined as the Company’s businesses for which financial information is available and reviewed regularly by management) and concluded that goodwill was not impaired. The Company's goodwill balance of $72.7 million at September 30, 2015 , did not significantly change during the third quarter and first nine months of 2015 . We did not record any goodwill impairment expense for the third quarter and first nine months of 2015 or 2014 .

Accrued Expenses and Other Liab

Accrued Expenses and Other Liabilities	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Accrued Expenses and Other Liabilities	Accrued Expenses and Other Liabilities Accrued expenses and other liabilities consist of the following: September 30, December 31, Accrued compensation $ 23,142 $ 13,659 Accrued expenses 12,818 6,220 Loan servicing liabilities at fair value 4,394 3,973 Deferred rent 4,150 1,377 Deferred tax liability 3,587 1,332 Deferred revenue 1,817 759 Loan funding payables 831 — Contingent liabilities 810 1,995 Payable to issuing bank 703 267 Transaction fee refund reserve 672 828 Early stock option exercise and other equity-related liabilities 333 392 Other 880 818 Total accrued expenses and other liabilities $ 54,137 $ 31,620

Accumulated Other Comprehensive

Accumulated Other Comprehensive Loss	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Accumulated Other Comprehensive Loss	Accumulated Other Comprehensive Loss Accumulated other comprehensive loss represents other cumulative gains and losses that are not reflected in earnings. The components of other comprehensive loss are as follows: Three Months Ended September 30, 2015 2014 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Change in net unrealized loss on securities available for sale $ (341 ) $ — $ (341 ) $ — $ — $ — Other comprehensive loss $ (341 ) $ — $ (341 ) $ — $ — $ — Nine Months Ended September 30, 2015 2014 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Change in net unrealized loss on securities available for sale $ (1,172 ) $ — $ (1,172 ) $ — $ — $ — Other comprehensive loss $ (1,172 ) $ — $ (1,172 ) $ — $ — $ — Accumulated other comprehensive loss balances are as follows: Total Accumulated Other Comprehensive Loss Balance at December 31, 2014 $ — Change in net unrealized loss on securities available for sale (1,172 ) Balance at September 30, 2015 $ (1,172 ) The Company did not have any items of other comprehensive income (loss) during the first nine months of 2014.

Employee Incentive and Retireme

Employee Incentive and Retirement Plans	9 Months Ended
	Sep. 30, 2015
Postemployment Benefits [Abstract]
Employee Incentive and Retirement Plans	Employee Incentive and Retirement Plans The Company’s equity incentive plans provide for granting stock options and restricted stock units (RSUs) to employees, consultants, officers and directors. In addition, the Company offers a retirement plan and an Employee Stock Purchase Plan (ESPP) to eligible employees. Stock-based compensation expense was as follows for the periods presented: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Stock options $ 8,101 $ 6,996 $ 23,314 $ 19,484 ESPP 491 — 1,416 — RSUs 3,037 — 5,262 — Stock issued related to acquisition 1,850 3,541 7,566 6,405 Total stock-based compensation expense $ 13,479 $ 10,537 $ 37,558 $ 25,889 The following table presents the Company's stock-based compensation expense recorded in the condensed consolidated statements of operations: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Sales and marketing $ 2,048 $ 912 $ 5,373 $ 5,029 Origination and servicing 817 599 2,405 1,427 General and administrative: Engineering and product development 2,554 1,492 6,392 3,487 Other 8,060 7,534 23,388 15,946 Total stock-based compensation expense $ 13,479 $ 10,537 $ 37,558 $ 25,889 Additionally, we capitalized $1.3 million and $0.6 million of stock-based compensation expense associated with the cost of developing software for internal use during the third quarters of 2015 and 2014 , respectively. We capitalized $3.1 million and $1.2 million of stock-based compensation expense associated with the cost of developing software for internal use during the first nine months of 2015 and 2014 , respectively. Stock Options There were no significant changes to the Company's incentive plans or valuation methodology for stock options during the third quarter and first nine months of 2015 . The Company used the following assumptions in the Black-Scholes option pricing model to estimate the fair value of stock options granted during the periods presented: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Expected dividend yield — — — — Weighted-average assumed stock price volatility 48.7 % 50.5 % 49.4 % 54.0 % Weighted-average risk-free rate 1.67 % 1.87 % 1.61 % 1.91 % Weighted-average expected life (in years) 6.25 6.25 6.25 6.38 The following table summarizes the activities for the Company's stock options during the first nine months of 2015 : Number of Options Weighted- Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2014 57,386,829 $ 3.15 Options granted 1,164,929 $ 20.00 Options exercised (5,407,540 ) $ 1.46 Options forfeited/expired (1,844,875 ) $ 6.45 Outstanding at September 30, 2015 51,299,343 $ 3.59 7.3 $ 503,203 Vested and expected to vest at September 30, 2015 50,807,451 $ 3.54 7.3 $ 500,401 Exercisable at September 30, 2015 26,216,233 $ 1.58 6.5 $ 306,781 For the first nine months of 2015 , we granted service-based stock options to purchase 1,164,929 shares of common stock with a weighted average exercise price of $20.00 per share, a weighted average grant date fair value of $9.80 per option share and an aggregate estimated fair value of $11.4 million . For the first nine months of 2014 , we granted service-based stock options to purchase 18,511,572 shares of common stock with a weighted average exercise price of $5.91 per option share, a weighted average grant date fair value of $4.37 per share and a total estimated fair value of $81.0 million . Options to purchase 5,407,540 shares with a total intrinsic value of $75.3 million were exercised during the first nine months of 2015 . Options to purchase 5,638,830 shares with a total intrinsic value of $40.4 million were exercised during the first nine months of 2014 . The total grant date fair value of stock options vested during the first nine months of 2015 and 2014 was $26.0 million and $14.7 million , respectively. For the first nine months of 2014 , we incurred $3.0 million of expense for the accelerated vesting of stock options for a terminated employee that was accounted for as a stock option modification. We did not accelerate vesting of any stock options during the third quarter and first nine months of 2015 . As of September 30, 2015 total unrecognized compensation cost was $100.8 million , which is expected to be recognized over the next 2.6 years. Since the Company holds a full valuation allowance against all deferred tax benefits, no income tax benefit has been recognized for stock-based compensation expense or for exercised stock options. During the second quarter of 2015, the Company launched a rescission offer allowing certain holders of outstanding, unexercised options and shares of common stock to rescind the grant of options and sale of shares back to the Company. The rescission offer was required by the California Department of Business Oversight to address California securities laws compliance issues raised in connection with the Company's permit for qualification filed in July 2014. The offer expired on July 15, 2015 and there were no material acceptances of the rescission offer. Restricted Stock Units During the first quarter of 2015, the Company began issuing RSUs to certain employees, officers, and directors. The following table summarizes the activities for the Company's RSUs during the first nine months of 2015 : Number of RSUs Weighted- Unvested at December 31, 2014 — $ — RSUs granted 3,518,967 $ 16.60 RSUs vested (99,300 ) $ 20.29 RSUs forfeited/expired (106,694 ) $ 19.53 Unvested at September 30, 2015 3,312,973 $ 16.39 Expected to vest after September 30, 2015 3,177,419 $ 16.42 For the first nine months of 2015 , we granted 3,518,967 RSUs with an aggregate fair value of $58.4 million . As of September 30, 2015 , there was $54.3 million of unrecognized compensation cost related to unvested RSUs, which is expected to be recognized over the next 3.6 years. Employee Stock Purchase Plan Under the Company’s ESPP, eligible employees can purchase shares of the Company’s common stock using amounts withheld through payroll deductions, subject to plan limitations. Payroll deductions are accumulated during six -month offering periods. The purchase price for each share of common stock is 85% of the lower of the fair market value of the common stock on the first business day of the offering period or on the last business day of the offering period. During the third quarter of 2015, the Company did not purchase any shares under the ESPP. The Company's employees purchased 211,256 shares under the ESPP during the first nine months of 2015 . As of September 30, 2015 , a total of 2,788,744 shares of common stock were reserved for issuance under the ESPP. The fair value of stock purchase rights granted to employees under the ESPP is measured on the grant date using the Black-Scholes option pricing model. The compensation expense related to ESPP purchase rights is recognized on a straight-line basis, net of estimated forfeitures, over the six -month requisite service period. We used the following assumptions in estimating the fair value of the grant under the ESPP on June 11, 2015, which are derived using the same methodology applied to stock option assumptions: Expected dividend yield — Weighted-average assumed stock price volatility 38.8 % Weighted-average risk-free rate 0.10 % Weighted-average expected life (in years) 0.42

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2015
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes For the third quarter and first nine months of 2015 we recorded income tax expense of $1.2 million and $2.2 million , respectively, due to the recognition of the amortization of tax deductible goodwill that gives rise to an indefinite-lived deferred tax liability. Income tax expense was $0.4 million and $1.1 million for the third quarter and first nine months of 2014 , respectively. The Company continues to recognize a full valuation allowance against deferred tax assets. This determination was based on the assessment of the available positive and negative evidence to estimate if sufficient future taxable income will be generated to utilize the existing deferred tax assets. As of September 30, 2015 , the valuation allowance was $41.3 million .

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Operating Lease Commitments The Company's corporate headquarters are located in San Francisco, California, and consist of approximately 155,000 square feet of space under lease agreements, most of which expire in June 2022 . Under these lease agreements, the Company has an option to extend nearly all of the space for five years. On April 16, 2015 , the Company entered into a lease agreement for additional office space in San Francisco, California. The lease agreement commenced in the second quarter of 2015 with delivery of portions of the leased space to occur in stages through March 2017. The lease agreement expires on March 31, 2026, with the right to renew the lease term for two consecutive renewal terms of five years each. The Company has additional leased office space of approximately 26,000 square feet in Westborough, Massachusetts, under a lease agreement that expires in July 2021 . Total facilities rental expense for the third quarter and first nine months of 2015 was $2.0 million and $5.0 million , respectively. Total facilities rental expense for the third quarter and first nine months of 2014 was $1.0 million and $2.5 million , respectively. Minimum lease payments for the third quarter and first nine months of 2015 were $1.5 million and $4.1 million , respectively. Minimum lease payments for the third quarter and first nine months of 2014 were $0.9 million and $2.2 million , respectively. As of September 30, 2015 , we have pledged $0.7 million of cash as a security deposit under these lease agreements. Expected annual minimum rental payments under these leases at September 30, 2015 , are as follows: (in millions) Minimum Rental Payments 2015 $ 1.9 2016 11.4 2017 14.1 2018 15.1 2019 14.6 Thereafter 71.1 Total $ 128.2 Loan Funding and Purchase Commitments The Company commits to fund loans resulting from our direct marketing efforts if such loans are not otherwise funded by investors on our platform. During the third quarter and first nine months of 2015, the Company was not required to fund any such loans. Additionally, loans in the process of being facilitated and originated by our issuing bank partner at September 30, 2015, were fully funded in October 2015 and the Company was not required to fund any of these loans. Springstone has a commitment to purchase certain loans that it facilitates that are originated by an issuing bank partner if Springstone cannot arrange investors to purchase such loans. In connection with this arrangement, in June 2014 the Company entered into a contingent purchase agreement with the issuing bank and a third-party investor who agreed to purchase 100% participation interests in certain loans originated by the issuing bank through the Springstone platform. In March 2015 , this agreement was extended to January 2016 . The Company's contingent purchase commitment provides that if the third-party investor defaults on its purchase obligation then the Company will purchase such loans from the issuing bank. The remaining limit of this contingent loan purchase commitment under the March 2015 agreement was $32.2 million at September 30, 2015 . In July 2015, the issuing bank, the Company and a second third-party investor entered into a second loan participation purchase agreement with respect to the same type of loans covered by the March 2015 agreement. With respect to this second agreement, the Company also has a contingent purchase obligation in the event that the second third-party investor defaults on its purchase obligation. Although this second agreement does not have a purchase limit, Springstone may cease facilitating loans that are subject to these purchase commitments upon proper notice to the issuing bank. During the third quarter and first nine months of 2015 we were not required to purchase any loan participation interests pursuant to these contingent purchase commitments. The Company does not anticipate that the Company will be required to purchase loan participation interests under these commitments. Credit Support Agreement We are subject to a credit support agreement with a certificate investor. The credit support agreement requires us to pledge and restrict cash in support of our contingent obligation to reimburse the investor for credit losses on loans underlying the investor’s certificates that are in excess of a specified, aggregate loss threshold. We are contingently obligated to pledge cash, not to exceed $5.0 million , to support this contingent obligation. As of September 30, 2015 , and December 31, 2014, approximately $3.4 million was pledged and restricted to support this contingent obligation. As of September 30, 2015 , the credit losses pertaining to the investor’s certificates have not exceeded the specified threshold, nor are future credit losses expected to exceed the specified threshold, and thus no liability has been recorded. We currently do not anticipate recording losses under this credit support agreement. If losses related to the credit support agreement are later determined to be likely to occur and are estimable, results of operations could be affected in the period in which such losses are recorded. Loan Purchase Obligation Under our loan account program with WebBank, a Utah-chartered industrial bank that serves as our primary issuing bank, WebBank retains ownership of the loans facilitated through our marketplace for two business days after origination. As part of this arrangement, we have committed to purchase the loans at par plus accrued interest, at the conclusion of the two business days. As of September 30, 2015 , we were committed to purchase loans with an outstanding principal balance of $14.0 million at par plus accrued interest. At December 31, 2014 , we were committed to purchase loans with an outstanding principal balance of $4.1 million at par plus accrued interest. Legal On June 5, 2014, Springstone received a Civil Investigative Demand from the Consumer Financial Protection Bureau, referred to as CFPB, related to the period from 2009 through May 2014. The purpose of the investigation was to determine whether Springstone engaged in unlawful acts or practices in connection with the marketing, issuance, and servicing of loans for certain healthcare related financings during the period. On August 19, 2015, Springstone agreed to settle with the CFPB related to the CFPB's concerns about possible borrower confusion of the terms of a deferred interest product, which was terminated by the Company in December 2014. To resolve this matter, Springstone agreed to pay restitution of $700 thousand to certain borrowers under the Springstone finance program between 2009 and 2014. The settlement amount has been recorded as a liability as of September 30, 2015. The settlement amount is fully covered by the indemnification provisions of the Springstone purchase agreement and, therefore, did not result in an adverse financial charge to the Company. In addition to the foregoing, we may be subject to legal proceedings and regulatory actions in the ordinary course of business. We do not believe it is probable that the ultimate liability, if any, arising out of any such matter will have a material effect on our financial condition, results of operations or cash flows.

Segment Reporting

Segment Reporting	9 Months Ended
	Sep. 30, 2015
Segment Reporting [Abstract]
Segment Reporting	Segment Reporting The Company reports segment information using the “management approach.” Under this approach, operating segments are identified in substantially the same manner as they are reported internally and used by us for purposes of evaluating performance and allocating resources. Based on this approach, the Company has one reportable segment. The Company's management reporting process is based on our internal operating structure.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2015
Related Party Transactions [Abstract]
Related Party Transactions	Related Party Transactions Several of our executive officers and directors (including immediate family members) have opened investor accounts with us, made deposits and withdrawals to their accounts, and purchased notes or certificates. All note and certificate purchases made by related parties were transacted on terms and conditions that were not more favorable than those obtained by unaffiliated third-party investors. The deposits made by related parties whose transactions totaled $120 thousand or more were $500 thousand during the third quarter of 2014 and $750 thousand and $1.65 million during the first nine months of 2015 and 2014, respectively. There were no deposits made by related parties during the third quarter of 2015. The withdrawals made by related parties whose transactions totaled $120 thousand or more were $99 thousand and $22 thousand during the third quarters of 2015 and 2014, respectively, and $553 thousand and $132 thousand during the first nine months of 2015 and 2014, respectively.

Springstone Acquisition

Springstone Acquisition	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Springstone Acquisition	Springstone Acquisition In April 2015, we completed the allocation of the purchase price of our acquisition of Springstone to acquired assets and liabilities. There were no material adjustments to the preliminary purchase price allocation as included in " Part II - Item 8 - Financial Statements and Supplementary Data - Note 17 - Springstone Acquisition " in our Annual Report. The following 2014 pro forma financial information summarizes the combined results of operations for Lending Club and Springstone, as though the companies were originally combined as of January 1, 2013. These pro forma results have been prepared for comparative purposes only and do not purport to be indicative of the results of operations which would have resulted had the acquisition occurred as of January 1, 2013, nor is it indicative of future operating results. The pro forma results presented below include interest expense on the debt financing, amortization of acquired intangible assets, compensation expense related to the post-acquisition compensation arrangements entered into with the continuing employees, and tax expense. Results for the third quarter and first nine months of 2015 , as presented in the Condensed Consolidated Statements of Operations, reflect consolidated results, including Springstone, for the full period. Three Months Ended Nine Months Ended Total net revenue $ 56,074 $ 148,317 Net loss $ (5,947 ) $ (21,403 ) Basic net loss per share attributable to common stockholders $ (0.10 ) $ (0.37 ) Diluted net loss per share attributable to common stockholders $ (0.10 ) $ (0.37 )

Subsequent Events

Subsequent Events	9 Months Ended
	Sep. 30, 2015
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events The Company has evaluated the impact of events that have occurred subsequent to September 30, 2015 , through the date the condensed consolidated financial statements were filed with the SEC. Based on this evaluation, other than as recorded or disclosed within these condensed consolidated financial statements and related notes, the Company has determined none of these events were required to be recognized or disclosed.

New Accounting Standards (Polic

New Accounting Standards (Policies)	9 Months Ended
	Sep. 30, 2015
Accounting Policies [Abstract]
Basis of Accounting, Policy	LendingClub Corporation (Lending Club) is an online marketplace connecting borrowers and investors. LC Advisors, LLC (LCA), is a registered investment advisor with the Securities and Exchange Commission (SEC) and wholly-owned subsidiary of Lending Club that acts as the general partner for certain private funds and advisor to separately managed accounts. Springstone Financial, LLC (Springstone), is a wholly-owned subsidiary of Lending Club that facilitates education and patient finance loans. LC Trust I (the Trust) is an independent Delaware business trust that acquires and holds loans from Lending Club for the sole benefit of certain investors that purchase trust certificates (Certificates) issued by the Trust and that are related to underlying loans. The accompanying unaudited condensed consolidated financial statements include Lending Club, the Trust, LCA and Springstone (collectively referred to as the Company, we, or us). All intercompany balances and transactions have been eliminated. These condensed consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (GAAP) for interim financial information necessary for the fair statement of the results and financial position for the periods presented. The Company's results of operations and cash flows for any interim period are not necessarily indicative of the results for the full year or any other interim period. The accompanying interim condensed consolidated financial statements and these related notes should be read in conjunction with the consolidated financial statements and related notes included in the Company’s Annual Report on Form 10-K for the year ended December 31, 2014 (Annual Report).
Impact of New Accounting Standards	In February 2015, the Financial Accounting Standards Board (FASB) issued new guidance amending accounting for consolidations, which will be effective January 1, 2016. The guidance changes what an investor must consider in determining whether it is required to consolidate an entity in which it holds an interest. The Company is currently evaluating the impact of this guidance on the Company’s financial position, results of operations, earnings per common share, and cash flows. In April 2015, the FASB issued new guidance amending accounting for customer's cloud based fees, which will be effective January 1, 2016. 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. The Company is currently evaluating the impact of this guidance on the Company’s financial position, results of operations, earnings per common share, and cash flows. In September 2015, the FASB amended existing guidance related to recognition of adjustments to provisional amounts recorded during purchase accounting. Changes recognized during the measurement period will be recognized prospectively as adjustments to goodwill, with corresponding changes in income or expense, such as revised depreciation or amortization, recognized in current period earnings. This amendment is effective January 1, 2016. Since we do not currently have any open measurement periods related to any business acquisition, adoption of this standard will not have an impact on the Company's financial position, results of operations, earnings per common share, or cash flows.
Marketable Securities, Available-for-sale Securities, Policy	Management evaluates whether securities available for sale are OTTI on a quarterly basis. Debt securities with unrealized losses are considered OTTI if the Company intends to sell the security or if it is more likely than not that it will be required to sell such security before any anticipated recovery. If management determines that a security is OTTI under these circumstances, the impairment recognized in earnings is measured as the entire difference between the amortized cost and then-current fair value. A security is also OTTI if management does not expect to recover all of the amortized cost of the security. In this circumstance, the impairment recognized in earnings represents estimated credit loss, and is measured by the difference between the present value of expected cash flows and the amortized cost of the security. Management utilizes cash flow models to estimate the expected future cash flow from the securities to estimate the credit loss when necessary. Expected cash flows are discounted using the security's effective interest rate. The evaluation of whether the Company expects to recover the amortized cost of a security is inherently judgmental. The evaluation includes the assessment of several security performance indicators, including the magnitude and duration of the unrealized loss and whether the Company has received all scheduled principal and interest payments.
Fair Value Measurement, Policy	For a description of the fair value hierarchy and the Company’s fair value methodologies, see " Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 - Summary of Significant Accounting Policies " in the Annual Report. The Company did not transfer any assets or liabilities in or out of level 3 during the third quarter and first nine months of 2015 or the year ended December 31, 2014 . Financial Instruments Recorded at Fair Value See " Part II - Item 8 - Financial Statements and Supplementary Data - Note 2 - Summary of Significant Accounting Policies " in the Company's Annual Report for a description of the fair value methodology for loans, notes and certificates. In the third quarter of 2015, the Company incorporated cumulative prepayments into the valuation of loans, notes and certificates to better reflect a market participant's view of valuation assumptions underlying unsecured consumer credit obligations. Prior to the third quarter, the effect of prepayments was reflected through an effective adjustment to the discount rates used in the fair value methodology. Cumulative prepayments are estimates of the cumulative amount of principal prepayments that will occur over the entire life of a loan expressed as a percentage of the original principal amount of the loan. The assumption regarding cumulative prepayments reduces the projected balances and expected terms of the loans, notes and certificates. When available, the Company uses quoted prices in active markets to measure the fair value of securities available for sale. When utilizing market data and bid-ask spreads, the Company uses the price within the bid-ask spread that best represents fair value. When quoted prices do not exist, the Company uses prices obtained from independent third-party pricing services to measure the fair value of securities available for sale. The Company'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 "to-be-issued" securities. The Company 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. The Company 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.

Net Income (Loss) Per Share a26

Net Income (Loss) Per Share and Net Income (Loss) Attributable to Common Stockholders (Tables)	9 Months Ended
	Sep. 30, 2015
Earnings Per Share [Abstract]
Basic and Diluted Net Income (Loss) per Share	The following table details the computation of the basic and diluted net income (loss) per share: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Net income (loss) (1) $ 950 $ (7,371 ) $ (9,564 ) $ (23,857 ) Weighted average common shares - Basic 375,982,120 59,844,394 373,605,274 57,958,838 Weighted average common shares - Diluted 401,934,880 59,844,394 373,605,274 57,958,838 Basic net income (loss) per share attributable to common stockholders $ 0.00 $ (0.12 ) $ (0.03 ) $ (0.41 ) Diluted net income (loss) per share attributable to common stockholders $ 0.00 $ (0.12 ) $ (0.03 ) $ (0.41 ) (1) Also represents net income (loss) available to common stockholders. In a period with net income, both earnings and dividends (if any) are allocated to participating securities. In a period with a net loss, only declared dividends (if any) are allocated to participating securities. There were no dividends declared in the first nine months of 2015 or 2014 .

Securities Available for Sale (

Securities Available for Sale (Tables)	9 Months Ended
	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Schedule of Available-for-sale Securities Reconciliation	The amortized cost, gross unrealized gains and losses, and fair value of securities available for sale as of September 30, 2015 , are as follows: Amortized Cost Gross Unrealized Gains Gross Unrealized Losses Fair Value Corporate debt securities $ 251,253 $ 4 $ (1,144 ) $ 250,113 Asset-backed securities 54,990 4 (35 ) 54,959 U.S. agency securities 20,602 5 (4 ) 20,603 Municipal securities 5,840 3 — 5,843 Other securities 7,006 1 (6 ) 7,001 Total securities available for sale $ 339,691 $ 17 $ (1,189 ) $ 338,519
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value	A summary of securities available for sale with unrealized losses as of September 30, 2015 , 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 Corporate debt securities $ 241,480 $ (1,144 ) $ — $ — $ 241,480 $ (1,144 ) Asset-backed securities 49,955 (35 ) — — 49,955 (35 ) U.S. agency securities 11,600 (4 ) — — 11,600 (4 ) Other securities 4,999 (6 ) — — 4,999 (6 ) Total securities with unrealized losses (1) $ 308,034 $ (1,189 ) $ — $ — $ 308,034 $ (1,189 ) (1) The number of investment positions with unrealized losses totaled 142 .
Available-for-sale Securities	The contractual maturities of securities available for sale at September 30, 2015 , are as follows: Within 1 year After 1 year through 5 years After 5 years through 10 years After 10 years Total Corporate debt securities $ 28,120 $ 221,993 $ — $ — $ 250,113 Asset-backed securities — 54,959 — — 54,959 U.S. agency securities — 20,603 — — 20,603 Municipal securities — 5,843 — — 5,843 Other securities — 7,001 — — 7,001 Total fair value $ 28,120 $ 310,399 $ — $ — $ 338,519 Total amortized cost $ 28,151 $ 311,540 $ — $ — $ 339,691
Schedule of Realized Gain (Loss)	Proceeds and gross realized gains and losses from sales of securities available for sale are as follows: Three Months Ended September 30, Nine Months Ended September 30, 2015 2015 Proceeds $ 59,689 $ 63,198 Gross realized gains $ 58 $ 58 Gross realized losses $ — $ 1

Loans, Notes and Certificates28

Loans, Notes and Certificates, and Loan Servicing Rights (Tables)	9 Months Ended
	Sep. 30, 2015
Fair Value Disclosures [Abstract]
Loans and Notes and Certificates	At September 30, 2015 and December 31, 2014 , loans, notes and certificates measured at fair value on a recurring basis were as follows: Loans Notes and Certificates September 30, December 31, September 30, December 31, Aggregate principal balance outstanding $ 4,149,442 $ 2,836,729 $ 4,175,947 $ 2,851,837 Net fair value adjustments (80,468 ) (38,224 ) (80,466 ) (38,219 ) Fair value $ 4,068,974 $ 2,798,505 $ 4,095,481 $ 2,813,618 Original term 12 - 60 months 12 - 60 months Interest rates (fixed) 4.99% - 29.90% 5.79% - 29.90% Maturity dates ≤ September 2020 ≤ December 2019
Past Due Financing Receivables	At September 30, 2015 and December 31, 2014 , loans that were 90 days or more past due (including non-accrual loans) were as follows: September 30, 2015 December 31, 2014 > 90 days past due Non-accrual loans (1) > 90 days past due Non-accrual loans (1) Outstanding principal balance $ 28,716 $ 1,174 $ 19,790 $ 1,373 Net fair value adjustments (27,102 ) (1,091 ) (18,825 ) (1,289 ) Fair value $ 1,614 $ 83 $ 965 $ 84 # of loans (not in thousands) 2,512 94 1,797 125 (1) Includes all loans for which the Company has been notified that the borrower has filed for bankruptcy or is deceased, or that were 120 days or more past due.

Fair Value of Assets and Liab29

Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Loans, Loan Servicing Rights, Related Notes and Certificates	The following tables present the fair value hierarchy for assets and liabilities measured at fair value: September 30, 2015 Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Loans $ — $ — $ 4,068,974 $ 4,068,974 Securities available for sale: Corporate debt securities — 250,113 — 250,113 Asset-backed securities — 54,959 — 54,959 U.S. agency securities — 20,603 — 20,603 Municipal securities — 5,843 — 5,843 Other securities — 7,001 — 7,001 Total securities available for sale — 338,519 — 338,519 Servicing assets — — 7,249 7,249 Total assets $ — $ 338,519 $ 4,076,223 $ 4,414,742 Liabilities: Notes and certificates $ — $ — $ 4,095,481 $ 4,095,481 Servicing liabilities — — 4,394 4,394 Total liabilities $ — $ — $ 4,099,875 $ 4,099,875 December 31, 2014 Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Loans $ — $ — $ 2,798,505 $ 2,798,505 Servicing assets — — 2,181 2,181 Total assets $ — $ — $ 2,800,686 $ 2,800,686 Liabilities: Notes and certificates $ — $ — $ 2,813,618 $ 2,813,618 Servicing liabilities — — 3,973 3,973 Total liabilities $ — $ — $ 2,817,591 $ 2,817,591
Quantitative Information about Significant Unobservable Inputs Used for Fair Value Measurements	The following tables present quantitative information about the significant unobservable inputs used for our level 3 fair value measurements at September 30, 2015 and December 31, 2014 : September 30, 2015 Range of Inputs Financial Instrument Unobservable Input Minimum Maximum Weighted- Average Loans, notes and certificates Discount rates 3.5 % 17.5 % 8.9 % Net cumulative expected loss rates 0.3 % 22.0 % 9.7 % Cumulative prepayment rates 21.9 % 38.5 % 27.7 % Servicing asset/liability Discount rates 3.5 % 20.5 % 9.6 % Net cumulative expected loss rates 0.3 % 21.5 % 8.7 % Cumulative prepayment rates 8.4 % 48.7 % 29.0 % Base market servicing rates (% per annum on unpaid principal balance) (1) 0.50 % 0.75 % 0.50 % December 31, 2014 Range of Inputs Financial Instrument Unobservable Input Minimum Maximum Weighted- Average Loans, notes and certificates Discount rates 5.2 % 17.4 % 10.1 % Net cumulative expected loss rates 0.3 % 22.0 % 10.0 % Servicing asset/liability Discount rates 5.3 % 23.7 % 10.7 % Net cumulative expected loss rates 0.3 % 22.0 % 10.2 % Cumulative prepayment rates 16.5 % 26.7 % 20.0 % Base market servicing rates (% per annum on unpaid principal balance) (1) 0.50 % 0.70 % 0.50 % (1) Excludes ancillary fees charged to investors that would be passed on to a third-party servicer.
Fair Value Disclosure And Measurement	The table below shows the estimated impact on the estimated fair value of servicing assets and liabilities, calculated using different base market servicing rate assumptions as of September 30, 2015 and December 31, 2014 : September 30, 2015 December 31, 2014 Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Weighted-average base market servicing rate assumptions 0.50 % 0.50 % 0.50 % 0.50 % Change in fair value from: Servicing rate increase to 0.60% $ (2,566 ) $ 1,764 $ (915 ) $ 1,416 Servicing rate decrease to 0.40% $ 2,682 $ (1,649 ) $ 965 $ (1,366 )
Fair Value, by Balance Sheet Grouping	The following tables present the fair value hierarchy for financial instruments not recorded at fair value: September 30, 2015 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and cash equivalents $ 579,206 $ — $ 579,206 $ — $ 579,206 Restricted cash 159,216 — 159,216 — 159,216 Deposits 763 — 763 — 763 Total assets $ 739,185 $ — $ 739,185 $ — $ 739,185 Liabilities: Accounts payable $ 3,756 $ — $ 3,756 $ — $ 3,756 Payables to investors 150,880 — 150,880 — 150,880 Total liabilities $ 154,636 $ — $ 154,636 $ — $ 154,636 December 31, 2014 Carrying Amount Level 1 Inputs Level 2 Inputs Level 3 Inputs Balance at Fair Value Assets: Cash and cash equivalents $ 869,780 $ — $ 869,780 $ — $ 869,780 Restricted cash 46,763 — 46,763 — 46,763 Deposits 657 — 657 — 657 Total assets $ 917,200 $ — $ 917,200 $ — $ 917,200 Liabilities: Accounts payable $ 5,892 $ — $ 5,892 $ — $ 5,892 Payables to investors 38,741 — 38,741 — 38,741 Total liabilities $ 44,633 $ — $ 44,633 $ — $ 44,633
Loans, Notes and Certificates
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Table	The following tables present additional information about level 3 loans, notes and certificates, each measured at fair value on a recurring basis, for the third quarters and first nine months of 2015 and 2014 : Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at June 30, 2015 $ 3,694,823 $ (57,440 ) $ 3,637,383 $ 3,717,556 $ (57,432 ) $ 3,660,124 Purchases of loans 1,946,455 — 1,946,455 — — — Issuances of notes and certificates — — — 991,926 — 991,926 Whole loan sales (954,770 ) — (954,770 ) — — — Principal payments (481,701 ) — (481,701 ) (478,189 ) — (478,189 ) Charge-offs (55,365 ) 55,365 — (55,346 ) 55,346 — Recoveries — (5,919 ) (5,919 ) — (5,867 ) (5,867 ) Change in fair value recorded in earnings — (72,474 ) (72,474 ) — (72,513 ) (72,513 ) Ending balance at September 30, 2015 $ 4,149,442 $ (80,468 ) $ 4,068,974 $ 4,175,947 $ (80,466 ) $ 4,095,481 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at June 30, 2014 $ 2,351,515 $ (25,313 ) $ 2,326,202 $ 2,361,902 $ (25,307 ) $ 2,336,595 Purchases of loans 994,497 — 994,497 — — — Issuances of notes and certificates — — — 532,034 — 532,034 Whole loan sales (462,523 ) — (462,523 ) — — — Principal payments (288,102 ) — (288,102 ) (280,643 ) — (280,643 ) Charge-offs (28,910 ) 28,910 — (28,852 ) 28,852 — Recoveries — (2,594 ) (2,594 ) — (2,589 ) (2,589 ) Change in fair value recorded in earnings — (33,809 ) (33,809 ) — (33,757 ) (33,757 ) Ending balance at September 30, 2014 $ 2,566,477 $ (32,806 ) $ 2,533,671 $ 2,584,441 $ (32,801 ) $ 2,551,640 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at December 31, 2014 $ 2,836,729 $ (38,224 ) $ 2,798,505 $ 2,851,837 $ (38,219 ) $ 2,813,618 Purchases of loans 5,075,044 — 5,075,044 — — — Issuances of notes and certificates — — — 2,736,667 — 2,736,667 Whole loan sales (2,338,346 ) — (2,338,346 ) — — — Principal payments (1,280,005 ) — (1,280,005 ) (1,268,622 ) — (1,268,622 ) Charge-offs (143,980 ) 143,980 — (143,935 ) 143,935 — Recoveries — (13,729 ) (13,729 ) — (13,653 ) (13,653 ) Change in fair value recorded in earnings — (172,495 ) (172,495 ) — (172,529 ) (172,529 ) Ending balance at September 30, 2015 $ 4,149,442 $ (80,468 ) $ 4,068,974 $ 4,175,947 $ (80,466 ) $ 4,095,481 Loans Notes and Certificates Outstanding Principal Balance Valuation Adjustment Fair Value Outstanding Principal Balance Valuation Adjustment Fair Value Beginning balance at December 31, 2013 $ 1,849,042 $ (20,000 ) $ 1,829,042 $ 1,859,982 $ (19,992 ) $ 1,839,990 Purchases of loans 2,628,758 — 2,628,758 — — — Issuances of notes and certificates — — — 1,534,011 — 1,534,011 Whole loan sales (1,094,482 ) — (1,094,482 ) — — — Principal payments (739,506 ) — (739,506 ) (732,343 ) — (732,343 ) Charge-offs (77,335 ) 77,335 — (77,209 ) 77,209 — Recoveries — (5,178 ) (5,178 ) — (5,153 ) (5,153 ) Change in fair value recorded in earnings — (84,963 ) (84,963 ) — (84,865 ) (84,865 ) Ending balance at September 30, 2014 $ 2,566,477 $ (32,806 ) $ 2,533,671 $ 2,584,441 $ (32,801 ) $ 2,551,640
Servicing asset/liability
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Table	The following table presents additional information about level 3 servicing assets and liabilities measured at fair value on a recurring basis for the third quarters and first nine months of 2015 and 2014 : Three Months Ended September 30, 2015 Three Months Ended September 30, 2014 Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Fair value at beginning of period $ 5,225 $ 4,831 $ 1,034 $ 2,736 Issuances (1) 3,092 1,402 481 1,809 Changes in fair value, included in servicing fees (1,436 ) (1,839 ) (182 ) (833 ) Additions, included in deferred revenue 368 — 187 — Fair value at end of period $ 7,249 $ 4,394 $ 1,520 $ 3,712 Nine Months Ended Nine Months Ended Servicing Assets Servicing Liabilities Servicing Assets Servicing Liabilities Fair value at beginning of period $ 2,181 $ 3,973 $ 534 $ 936 Issuances (1) 6,476 4,340 1,355 3,464 Changes in fair value, included in servicing fees (2,467 ) (3,919 ) (841 ) (688 ) Additions, included in deferred revenue 1,059 — 472 — Fair value at end of period $ 7,249 $ 4,394 $ 1,520 $ 3,712 (1) Represents the offsets to the gains or losses on sales of the related loans, recorded in other revenue (expense).

Property, Equipment and Softw30

Property, Equipment and Software, Net (Tables)	9 Months Ended
	Sep. 30, 2015
Property, Plant and Equipment [Abstract]
Property, Equipment and Software	Property, equipment and software, net, consist of the following: September 30, December 31, Internally developed software $ 34,107 $ 16,023 Computer equipment 12,169 7,929 Leasehold improvements 8,868 4,802 Purchased software 4,843 3,326 Furniture and fixtures 4,232 2,405 Construction in progress 2,165 549 Total property, equipment and software 66,384 35,034 Accumulated depreciation and amortization (19,288 ) (7,983 ) Total property, equipment and software, net $ 47,096 $ 27,051

Other Assets (Tables)

Other Assets (Tables)	9 Months Ended
	Sep. 30, 2015
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]
Other Assets	assets consist of the following: September 30, December 31, Prepaid expenses $ 8,829 $ 6,807 Loan servicing assets at fair value 7,249 2,181 Accounts receivable 3,322 1,744 Deferred acquisition compensation 1,815 2,695 Deposits 763 657 Receivable from investors 568 155 Other 2,133 93 Total other assets $ 24,679 $ 14,332

Accrued Expenses and Other Li32

Accrued Expenses and Other Liabilities (Tables)	9 Months Ended
	Sep. 30, 2015
Payables and Accruals [Abstract]
Accrued Expenses and Other Liabilities	Accrued expenses and other liabilities consist of the following: September 30, December 31, Accrued compensation $ 23,142 $ 13,659 Accrued expenses 12,818 6,220 Loan servicing liabilities at fair value 4,394 3,973 Deferred rent 4,150 1,377 Deferred tax liability 3,587 1,332 Deferred revenue 1,817 759 Loan funding payables 831 — Contingent liabilities 810 1,995 Payable to issuing bank 703 267 Transaction fee refund reserve 672 828 Early stock option exercise and other equity-related liabilities 333 392 Other 880 818 Total accrued expenses and other liabilities $ 54,137 $ 31,620

Accumulated Other Comprehensi33

Accumulated Other Comprehensive Loss (Tables)	9 Months Ended
	Sep. 30, 2015
Equity [Abstract]
Comprehensive Income (Loss)	The components of other comprehensive loss are as follows: Three Months Ended September 30, 2015 2014 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Change in net unrealized loss on securities available for sale $ (341 ) $ — $ (341 ) $ — $ — $ — Other comprehensive loss $ (341 ) $ — $ (341 ) $ — $ — $ — Nine Months Ended September 30, 2015 2014 Before Tax Tax Effect Net of Tax Before Tax Tax Effect Net of Tax Change in net unrealized loss on securities available for sale $ (1,172 ) $ — $ (1,172 ) $ — $ — $ — Other comprehensive loss $ (1,172 ) $ — $ (1,172 ) $ — $ — $ —
Schedule of Accumulated Other Comprehensive Income (Loss)	Accumulated other comprehensive loss balances are as follows: Total Accumulated Other Comprehensive Loss Balance at December 31, 2014 $ — Change in net unrealized loss on securities available for sale (1,172 ) Balance at September 30, 2015 $ (1,172 )

Employee Incentive and Retire34

Employee Incentive and Retirement Plans (Tables)	9 Months Ended
	Sep. 30, 2015
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan	Stock-based compensation expense was as follows for the periods presented: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Stock options $ 8,101 $ 6,996 $ 23,314 $ 19,484 ESPP 491 — 1,416 — RSUs 3,037 — 5,262 — Stock issued related to acquisition 1,850 3,541 7,566 6,405 Total stock-based compensation expense $ 13,479 $ 10,537 $ 37,558 $ 25,889
Schedule of Stock-Based Compensation Expense Recorded for Stock Options, Warrants and Series F Convertible Preferred Stock	The following table presents the Company's stock-based compensation expense recorded in the condensed consolidated statements of operations: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Sales and marketing $ 2,048 $ 912 $ 5,373 $ 5,029 Origination and servicing 817 599 2,405 1,427 General and administrative: Engineering and product development 2,554 1,492 6,392 3,487 Other 8,060 7,534 23,388 15,946 Total stock-based compensation expense $ 13,479 $ 10,537 $ 37,558 $ 25,889
Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted	The Company used the following assumptions in the Black-Scholes option pricing model to estimate the fair value of stock options granted during the periods presented: Three Months Ended Nine Months Ended 2015 2014 2015 2014 Expected dividend yield — — — — Weighted-average assumed stock price volatility 48.7 % 50.5 % 49.4 % 54.0 % Weighted-average risk-free rate 1.67 % 1.87 % 1.61 % 1.91 % Weighted-average expected life (in years) 6.25 6.25 6.25 6.38
Options Activity Under Option Plan	The following table summarizes the activities for the Company's stock options during the first nine months of 2015 : Number of Options Weighted- Weighted-Average Remaining Contractual Life (in years) Aggregate Intrinsic Value Outstanding at December 31, 2014 57,386,829 $ 3.15 Options granted 1,164,929 $ 20.00 Options exercised (5,407,540 ) $ 1.46 Options forfeited/expired (1,844,875 ) $ 6.45 Outstanding at September 30, 2015 51,299,343 $ 3.59 7.3 $ 503,203 Vested and expected to vest at September 30, 2015 50,807,451 $ 3.54 7.3 $ 500,401 Exercisable at September 30, 2015 26,216,233 $ 1.58 6.5 $ 306,781
Schedule of Share-based Compensation, Restricted Stock and Restricted Stock Units Activity	The following table summarizes the activities for the Company's RSUs during the first nine months of 2015 : Number of RSUs Weighted- Unvested at December 31, 2014 — $ — RSUs granted 3,518,967 $ 16.60 RSUs vested (99,300 ) $ 20.29 RSUs forfeited/expired (106,694 ) $ 19.53 Unvested at September 30, 2015 3,312,973 $ 16.39 Expected to vest after September 30, 2015 3,177,419 $ 16.42
Available for ESPP
Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted	We used the following assumptions in estimating the fair value of the grant under the ESPP on June 11, 2015, which are derived using the same methodology applied to stock option assumptions: Expected dividend yield — Weighted-average assumed stock price volatility 38.8 % Weighted-average risk-free rate 0.10 % Weighted-average expected life (in years) 0.42

Commitments and Contingencies (

Commitments and Contingencies (Tables)	9 Months Ended
	Sep. 30, 2015
Commitments and Contingencies Disclosure [Abstract]
Schedule of Future Minimum Rental Payments for Operating Leases	Expected annual minimum rental payments under these leases at September 30, 2015 , are as follows: (in millions) Minimum Rental Payments 2015 $ 1.9 2016 11.4 2017 14.1 2018 15.1 2019 14.6 Thereafter 71.1 Total $ 128.2

Springstone Acquisition (Tables

Springstone Acquisition (Tables)	9 Months Ended
	Sep. 30, 2015
Business Combinations [Abstract]
Summary of Pro Forma Financial Information	Results for the third quarter and first nine months of 2015 , as presented in the Condensed Consolidated Statements of Operations, reflect consolidated results, including Springstone, for the full period. Three Months Ended Nine Months Ended Total net revenue $ 56,074 $ 148,317 Net loss $ (5,947 ) $ (21,403 ) Basic net loss per share attributable to common stockholders $ (0.10 ) $ (0.37 ) Diluted net loss per share attributable to common stockholders $ (0.10 ) $ (0.37 )

Net Income (Loss) Per Share a37

Net Income (Loss) Per Share and Net Income (Loss) Attributable to Common Stockholders - Basic and Diluted Net Income (Loss) per Share (Detail) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income (loss) (1)	$ 950	$ (7,371)	$ (9,564)	$ (23,857)
Basic weighted average common shares outstanding (shares)	375,982,120	59,844,394	373,605,274	57,958,838
Diluted weighted average common shares outstanding (shares)	401,934,880	59,844,394	373,605,274	57,958,838
Net income (loss) per common share:
Basic ($ per share)	$ 0	$ (0.12)	$ (0.03)	$ (0.41)
Diluted ($ per share)	$ 0	$ (0.12)	$ (0.03)	$ (0.41)

Securities Available for Sale -

Securities Available for Sale - Amortized cost/fair value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	$ 339,691
Gross Unrealized Gains	17
Gross Unrealized Losses	(1,189)
Securities available for sale:	338,519	$ 0
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	251,253
Gross Unrealized Gains	4
Gross Unrealized Losses	(1,144)
Securities available for sale:	250,113
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	54,990
Gross Unrealized Gains	4
Gross Unrealized Losses	(35)
Securities available for sale:	54,959
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	20,602
Gross Unrealized Gains	5
Gross Unrealized Losses	(4)
Securities available for sale:	20,603
Municipal securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	5,840
Gross Unrealized Gains	3
Gross Unrealized Losses	0
Securities available for sale:	5,843
Other securities
Schedule of Available-for-sale Securities [Line Items]
Amortized Cost	7,006
Gross Unrealized Gains	1
Gross Unrealized Losses	(6)
Securities available for sale:	$ 7,001

Securities Available for Sale39

Securities Available for Sale - Continuous loss (Details) $ in Thousands	Sep. 30, 2015USD ($)position
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	$ 308,034
Unrealized Losses, Less than 12 months	(1,189)
Fair Value, 12 months or longer	0
Unrealized Losses, 12 months or longer	0
Fair Value	308,034
Unrealized Losses	$ (1,189)
Number of positions with unrealized losses | position	142
Corporate debt securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	$ 241,480
Unrealized Losses, Less than 12 months	(1,144)
Fair Value, 12 months or longer	0
Unrealized Losses, 12 months or longer	0
Fair Value	241,480
Unrealized Losses	(1,144)
Asset-backed securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	49,955
Unrealized Losses, Less than 12 months	(35)
Fair Value, 12 months or longer	0
Unrealized Losses, 12 months or longer	0
Fair Value	49,955
Unrealized Losses	(35)
U.S. agency securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	11,600
Unrealized Losses, Less than 12 months	(4)
Fair Value, 12 months or longer	0
Unrealized Losses, 12 months or longer	0
Fair Value	11,600
Unrealized Losses	(4)
Other securities
Schedule of Available-for-sale Securities [Line Items]
Fair Value, Less than 12 months	4,999
Unrealized Losses, Less than 12 months	(6)
Fair Value, 12 months or longer	0
Unrealized Losses, 12 months or longer	0
Fair Value	4,999
Unrealized Losses	$ (6)

Securities Available for Sale40

Securities Available for Sale - Maturities (Details) $ in Thousands	Sep. 30, 2015USD ($)
Fair value
Within 1 year	$ 28,120
After 1 year through 5 years	310,399
After 5 years through 10 years	0
After 10 years	0
Total	338,519
Amortized cost
Within 1 year	28,151
After 1 year through 5 years	311,540
After 5 years through 10 years	0
After 10 years	0
Total	339,691
Corporate debt securities
Fair value
Within 1 year	28,120
After 1 year through 5 years	221,993
After 5 years through 10 years	0
After 10 years	0
Total	250,113
Asset-backed securities
Fair value
Within 1 year	0
After 1 year through 5 years	54,959
After 5 years through 10 years	0
After 10 years	0
Total	54,959
U.S. agency securities
Fair value
Within 1 year	0
After 1 year through 5 years	20,603
After 5 years through 10 years	0
After 10 years	0
Total	20,603
Municipal securities
Fair value
Within 1 year	0
After 1 year through 5 years	5,843
After 5 years through 10 years	0
After 10 years	0
Total	5,843
Other securities
Fair value
Within 1 year	0
After 1 year through 5 years	7,001
After 5 years through 10 years	0
After 10 years	0
Total	$ 7,001

Securities Available for Sale41

Securities Available for Sale - Gross realized losses (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2015
Investments, Debt and Equity Securities [Abstract]
Proceeds	$ 59,689	$ 63,198
Gross realized gains	58	58
Gross realized losses	$ 0	$ 1

Loans, Notes and Certificates42

Loans, Notes and Certificates, and Loan Servicing Rights (Detail) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair Value	$ 4,068,974	$ 2,798,505
Fair Value	$ 4,095,481	$ 2,813,618
Interest rate, minimum	4.99%	5.79%
Interest rate, maximum	29.90%	29.90%
Fair Value, Measurements, Recurring | Loans at Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	$ 4,149,442	$ 2,836,729
Fair value adjustments	(80,468)	(38,224)
Fair Value	4,068,974	2,798,505
Fair Value, Measurements, Recurring | Notes And Certificates At Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Aggregate principal balance outstanding	4,175,947	2,851,837
Fair value adjustments	(80,466)	(38,219)
Fair Value	$ 4,095,481	$ 2,813,618
Minimum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and certificates term	12 months	12 months
Maximum
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Notes and certificates term	60 months	60 months

Loans, Notes and Certificates43

Loans, Notes and Certificates, and Loan Servicing Rights - Past Due Table (Details) - Loans at Fair Value $ in Thousands	Sep. 30, 2015USD ($)Loan	Dec. 31, 2014USD ($)Loan
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Outstanding principal balance, past 90 days due	$ 28,716	$ 19,790
Outstanding principal balance, non-accrual loans	1,174	1,373
Net fair value adjustments, past 90 days due	(27,102)	(18,825)
Net fair value adjustments, non-accrual loans	(1,091)	(1,289)
Fair value, past 90 days due	1,614	965
Fair value, non-accrual loans	$ 83	$ 84
Number of loans, 90 days past due | Loan	2,512	1,797
Number of loans, non-accrual loans | Loan	94	125

Loans, Notes and Certificates44

Loans, Notes and Certificates, and Loan Servicing Rights - Additional Information (Detail) - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Number of days overdue to be considered a non-accrual loan	120 days
Debt instrument, interest rate, effective percentage rate range, minimum	4.99%	5.79%
Debt instrument, interest rate, effective percentage rate range, maximum	29.90%	29.90%
Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	12 months	12 months
Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	60 months	60 months
Loan Servicing Rights
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Payment frequency for the debt instrument	monthly	monthly
Debt instrument, interest rate, effective percentage rate range, minimum	2.99%	5.90%
Debt instrument, interest rate, effective percentage rate range, maximum	33.15%	33.15%
Debt instrument, maturity date, description	September 2,022	December 2,019
Principal balance of underlying loan servicing rights	$ 3,548	$ 1,872
Loan Servicing Rights | Minimum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	3 months	12 months
Loan Servicing Rights | Maximum
Loans, Notes and Certificates, and Loan Servicing Rights [Line Items]
Notes and certificates term	84 months	60 months

Fair Value of Assets and Liab45

Fair Value of Assets and Liabilities - Loans, Loan Servicing Rights, Related Notes and Certificates (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	$ 4,068,974	$ 2,798,505
Securities available for sale:	338,519	0
Servicing assets	7,249	2,181
Total assets	4,414,742	2,800,686
Notes and certificates	4,095,481	2,813,618
Servicing liabilities	4,394	3,973
Total liabilities	4,099,875	2,817,591
Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	250,113
Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	54,959
U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	20,603
Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	5,843
Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	7,001
Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Securities available for sale:	0
Servicing assets	0	0
Total assets	0	0
Notes and certificates	0	0
Servicing liabilities	0	0
Total liabilities	0	0
Level 1 Inputs | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 1 Inputs | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 1 Inputs | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 1 Inputs | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 1 Inputs | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	0	0
Securities available for sale:	338,519
Servicing assets	0	0
Total assets	338,519	0
Notes and certificates	0	0
Servicing liabilities	0	0
Total liabilities	0	0
Level 2 Inputs | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	250,113
Level 2 Inputs | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	54,959
Level 2 Inputs | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	20,603
Level 2 Inputs | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	5,843
Level 2 Inputs | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	7,001
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Loans	4,068,974	2,798,505
Securities available for sale:	0
Servicing assets	7,249	2,181
Total assets	4,076,223	2,800,686
Notes and certificates	4,095,481	2,813,618
Servicing liabilities	4,394	3,973
Total liabilities	4,099,875	$ 2,817,591
Level 3 Inputs | Corporate debt securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 3 Inputs | Asset-backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 3 Inputs | U.S. agency securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 3 Inputs | Municipal securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	0
Level 3 Inputs | Other securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Securities available for sale:	$ 0

Fair Value of Assets and Liab46

Fair Value of Assets and Liabilities - Quantitative Information about Significant Unobservable Inputs Used for Fair Value Measurements (Detail)	9 Months Ended	12 Months Ended
	Sep. 30, 2015	Dec. 31, 2014
Fair Value Inputs [Abstract]
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.50%	0.50%
Minimum
Fair Value Inputs [Abstract]
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.40%
Maximum
Fair Value Inputs [Abstract]
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.75%
Level 3 Inputs | Minimum | Loans, notes and certificates
Fair Value Inputs [Abstract]
Discount rates	3.50%	5.20%
Net cumulative expected loss rates	0.30%	0.30%
Cumulative prepayment rates	21.90%
Level 3 Inputs | Minimum | Servicing asset/liability
Fair Value Inputs [Abstract]
Discount rates	3.50%	5.30%
Net cumulative expected loss rates	0.30%	0.30%
Cumulative prepayment rates	8.40%	16.50%
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.50%	0.50%
Level 3 Inputs | Maximum | Loans, notes and certificates
Fair Value Inputs [Abstract]
Discount rates	17.50%	17.40%
Net cumulative expected loss rates	22.00%	22.00%
Cumulative prepayment rates	38.50%
Level 3 Inputs | Maximum | Servicing asset/liability
Fair Value Inputs [Abstract]
Discount rates	20.50%	23.70%
Net cumulative expected loss rates	21.50%	22.00%
Cumulative prepayment rates	48.70%	26.70%
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.75%	0.70%
Level 3 Inputs | Weighted- Average | Loans, notes and certificates
Fair Value Inputs [Abstract]
Discount rates	8.90%	10.10%
Net cumulative expected loss rates	9.70%	10.00%
Cumulative prepayment rates	27.70%
Level 3 Inputs | Weighted- Average | Servicing asset/liability
Fair Value Inputs [Abstract]
Discount rates	9.60%	10.70%
Net cumulative expected loss rates	8.70%	10.20%
Cumulative prepayment rates	29.00%	20.00%
Base market servicing rates (% per annum on unpaid principal balance)(1)	0.50%	0.50%

Fair Value of Assets and Liab47

Fair Value of Assets and Liabilities - Additional Information about Loans, Notes and Certificates Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Loans
Outstanding Principal Balance, Beginning	$ 3,694,823	$ 2,351,515	$ 2,836,729	$ 1,849,042
Valuation Adjustment, Beginning	(57,440)	(25,313)	(38,224)	(20,000)
Fair Value, Beginning	3,637,383	2,326,202	2,798,505	1,829,042
Outstanding Principal Balance, Purchases of loans	1,946,455	994,497	5,075,044	2,628,758
Valuation Adjustment, Purchases of loans	0	0	0	0
Fair Value, Purchases of loans	1,946,455	994,497	5,075,044	2,628,758
Outstanding Principal Balance, Issuances of notes and certificates	0	0	0	0
Valuation Adjustment, Issuances of notes and certificates	0	0	0	0
Fair Value, Issuances of notes and certificates	0	0	0	0
Outstanding Principal Balance, Whole loan sales	(954,770)	(462,523)	(2,338,346)	(1,094,482)
Valuation Adjustment, Whole loan sales	0	0	0	0
Fair Value, Whole loan sales	(954,770)	(462,523)	(2,338,346)	(1,094,482)
Outstanding Principal Balance, Principal payments	(481,701)	(288,102)	(1,280,005)	(739,506)
Valuation Adjustment, Principal payments	0	0	0	0
Fair Value, Principal payments	(481,701)	(288,102)	(1,280,005)	(739,506)
Outstanding Principal Balance, Charge-offs	(55,365)	(28,910)	(143,980)	(77,335)
Asset Valuation Adjustment, Charge-offs	55,365	28,910	143,980	77,335
Fair Value, Charge-offs	0	0	0	0
Outstanding Principal Balance, Recoveries	0	0	0	0
Valuation Adjustment, Recoveries	(5,919)	(2,594)	(13,729)	(5,178)
Fair Value, Recoveries	(5,919)	(2,594)	(13,729)	(5,178)
Outstanding Principal Balance, Change in fair value recorded in earnings	0	0	0	0
Valuation Adjustment, Change in fair value recorded in earnings	(72,474)	(33,809)	(172,495)	(84,963)
Fair Value, Change in fair value recorded in earnings	(72,474)	(33,809)	(172,495)	(84,963)
Outstanding Principal Balance, Ending	4,149,442	2,566,477	4,149,442	2,566,477
Valuation Adjustment, Ending	(80,468)	(32,806)	(80,468)	(32,806)
Fair Value, Ending	4,068,974	2,533,671	4,068,974	2,533,671
Notes and Certificates
Outstanding Principal Balance, Beginning	3,717,556	2,361,902	2,851,837	1,859,982
Valuation Adjustment, Beginning	(57,432)	(25,307)	(38,219)	(19,992)
Fair Value, Beginning	3,660,124	2,336,595	2,813,618	1,839,990
Outstanding Principal Balance, Purchases of loans	0	0	0	0
Valuation Adjustment, Purchases of loans	0	0	0	0
Fair Value, Purchases of loans	0	0	0	0
Outstanding Principal Balance, Issuances of notes and certificates	991,926	532,034	2,736,667	1,534,011
Valuation Adjustment, Issuances of notes and certificates	0	0	0	0
Fair Value, Issuances of notes and certificates	991,926	532,034	2,736,667	1,534,011
Outstanding Principal Balance, Whole loan sales	0	0	0	0
Valuation Adjustment, Whole loan sales	0	0	0	0
Fair Value, Whole loan sales	0	0	0	0
Outstanding Principal Balance, Principal payments	(478,189)	(280,643)	(1,268,622)	(732,343)
Valuation Adjustment, Principal payments	0	0	0	0
Fair Value, Principal payments	(478,189)	(280,643)	(1,268,622)	(732,343)
Outstanding Principal Balance, Recovers	0	0	0	0
Valuation Adjustment, Recoveries	(5,867)	(2,589)	(13,653)	(5,153)
Fair Value, Recoveries	(5,867)	(2,589)	(13,653)	(5,153)
Outstanding Principal Balance, Charge-offs	(55,346)	(28,852)	(143,935)	(77,209)
Valuation Adjustment, Charge-offs	55,346	28,852	143,935	77,209
Fair Value, Charge-offs	0	0	0	0
Outstanding Principal Balance, Change in fair value recorded in earnings	0	0	0	0
Valuation Adjustment, Change in fair value recorded in earnings	(72,513)	(33,757)	(172,529)	(84,865)
Fair Value, Change in fair value recorded in earnings	(72,513)	(33,757)	(172,529)	(84,865)
Outstanding Principal Balance, Ending	4,175,947	2,584,441	4,175,947	2,584,441
Valuation Adjustment, Ending	(80,466)	(32,801)	(80,466)	(32,801)
Fair Value, Ending	$ 4,095,481	$ 2,551,640	$ 4,095,481	$ 2,551,640

Fair Value of Assets and Liab48

Fair Value of Assets and Liabilities - Additional Information about Servicing Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Servicing Assets, Changes in fair value due to:
Fair value at beginning of period			$ 2,181
Fair value at end of period	$ 7,249		7,249		$ 2,181
Servicing Liabilities, Changes in fair value due to:
Fair value at beginning of period			3,973
Fair value at end of period	4,394		4,394		3,973
Fair Value, Measurements, Recurring
Servicing Assets, Changes in fair value due to:
Fair value at beginning of period	5,225	$ 1,034	2,181	$ 534	534
Additions, included in other/deferred revenue	3,092	481	6,476	1,355
Changes in fair value, included in servicing fees	(1,436)	(182)	(2,467)	(841)
Fair value at end of period	7,249	1,520	7,249	1,520	2,181
Servicing Liabilities, Changes in fair value due to:
Fair value at beginning of period	4,831	2,736	3,973	936	936
Additions, included in other/deferred revenue	1,402	1,809	4,340	3,464
Changes in fair value, included in servicing fees	(1,839)	(833)	(3,919)	(688)
Fair value at end of period	4,394	3,712	4,394	3,712	$ 3,973
Deferred Revenue | Fair Value, Measurements, Recurring
Servicing Assets, Changes in fair value due to:
Additions, included in other/deferred revenue	368	187	1,059	472
Servicing Liabilities, Changes in fair value due to:
Additions, included in other/deferred revenue	$ 0	$ 0	$ 0	$ 0

Fair Value of Assets and Liab49

Fair Value of Assets and Liabilities - Additional Information about Servicing Assets and Liabilities Measured Using Different Market Servicing Rates and Different Prepayment (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Base market servicing rates (% per annum on unpaid principal balance)(1)			0.50%		0.50%
Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Base market servicing rates (% per annum on unpaid principal balance)(1)			0.50%		0.50%
Changes in fair value, included in servicing fees	$ (1,436)	$ (182)	$ (2,467)	$ (841)
Changes in fair value, included in servicing fees	$ (1,839)	$ (833)	(3,919)	$ (688)
Servicing rate increase to 0.60%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value, included in servicing fees			(2,566)		$ (915)
Servicing rate increase to 0.60% | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value, included in servicing fees			1,764		1,416
Servicing rate decrease to 0.40%
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value, included in servicing fees			2,682		965
Servicing rate decrease to 0.40% | Fair Value, Measurements, Recurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Changes in fair value, included in servicing fees			$ (1,649)		$ (1,366)
Minimum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Base market servicing rates (% per annum on unpaid principal balance)(1)			0.40%
Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Base market servicing rates (% per annum on unpaid principal balance)(1)			0.75%

Fair Value of Assets and Liab50

Fair Value of Assets and Liabilities - Not Measured at Fair Value (Details) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	$ 4,414,742	$ 2,800,686
Total liabilities	4,099,875	2,817,591
Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	0	0
Total liabilities	0	0
Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	338,519	0
Total liabilities	0	0
Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total assets	4,076,223	2,800,686
Total liabilities	4,099,875	2,817,591
Carrying Amount
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	579,206	869,780
Restricted cash	159,216	46,763
Deposits	763	657
Total assets	739,185	917,200
Accounts payable	3,756	5,892
Payables to investors	150,880	38,741
Total liabilities	154,636	44,633
Portion at Other than Fair Value Measurement | Level 1 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Restricted cash	0	0
Deposits	0	0
Total assets	0	0
Accounts payable	0	0
Payables to investors	0	0
Total liabilities	0	0
Portion at Other than Fair Value Measurement | Level 2 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	579,206	869,780
Restricted cash	159,216	46,763
Deposits	763	657
Total assets	739,185	917,200
Accounts payable	3,756	5,892
Payables to investors	150,880	38,741
Total liabilities	154,636	44,633
Portion at Other than Fair Value Measurement | Level 3 Inputs
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	0	0
Restricted cash	0	0
Deposits	0	0
Total assets	0	0
Accounts payable	0	0
Payables to investors	0	0
Total liabilities	0	0
Balance at Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	579,206	869,780
Restricted cash	159,216	46,763
Deposits	763	657
Total assets	739,185	917,200
Accounts payable	3,756	5,892
Payables to investors	150,880	38,741
Total liabilities	$ 154,636	$ 44,633

Property, Equipment and Softw51

Property, Equipment and Software, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Property, Plant and Equipment [Abstract]
Internally developed software	$ 34,107	$ 16,023
Computer equipment	12,169	7,929
Leasehold improvements	8,868	4,802
Purchased software	4,843	3,326
Furniture and fixtures	4,232	2,405
Construction in progress	2,165	549
Total property, equipment and software	66,384	35,034
Accumulated depreciation and amortization	(19,288)	(7,983)
Total property, equipment and software, net	$ 47,096	$ 27,051

Property, Equipment and Softw52

Property, Equipment and Software, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense			$ 15,525	$ 6,620
Property, Equipment and Software
Property, Plant and Equipment [Line Items]
Depreciation and amortization expense	$ 4,500	$ 1,800	$ 11,400	$ 4,100

Other Assets (Detail)

Other Assets (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Other Assets [Abstract]
Other assets	$ 24,679	$ 14,332
Prepaid expenses
Other Assets [Abstract]
Other assets	8,829	6,807
Loan servicing assets at fair value
Other Assets [Abstract]
Other assets	7,249	2,181
Accounts receivable
Other Assets [Abstract]
Other assets	3,322	1,744
Deferred acquisition compensation
Other Assets [Abstract]
Other assets	1,815	2,695
Deposits
Other Assets [Abstract]
Other assets	763	657
Receivable from investors
Other Assets [Abstract]
Other assets	568	155
Other
Other Assets [Abstract]
Other assets	$ 2,133	$ 93

Intangible Assets and Goodwill

Intangible Assets and Goodwill - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Goodwill and Intangible Assets Disclosure [Abstract]
Intangible assets, net	$ 32,227		$ 32,227		$ 36,302
Amortization expense	1,300	$ 1,400	4,100	$ 2,500
Goodwill	$ 72,683		$ 72,683		$ 72,592

Accrued Expenses and Other Li55

Accrued Expenses and Other Liabilities (Detail) - USD ($) $ in Thousands	Sep. 30, 2015	Dec. 31, 2014
Payables and Accruals [Abstract]
Accrued compensation	$ 23,142	$ 13,659
Accrued expenses	12,818	6,220
Loan servicing liabilities at fair value	4,394	3,973
Deferred rent	4,150	1,377
Deferred tax liability	3,587	1,332
Deferred revenue	1,817	759
Loan funding payables	831	0
Contingent liabilities	810	1,995
Payable to issuing bank	703	267
Transaction fee refund reserve	672	828
Early stock option exercise and other equity-related liabilities	333	392
Other	880	818
Total accrued expenses and other liabilities	$ 54,137	$ 31,620

Accumulated Other Comprehensi56

Accumulated Other Comprehensive Loss - Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Equity [Abstract]
Change in net unrealized loss on securities available for sale	$ (341)	$ 0	$ (1,172)	$ 0
Tax Effect, Change in net unrealized loss on securities available for sale	0	0	0	0
Net of Tax, Change in net unrealized loss on securities available for sale	(341)	0	(1,172)	0
Other comprehensive loss, before tax	(341)	0	(1,172)	0
Income tax effect	0	0	0	0
Other comprehensive loss, net of tax	$ (341)	$ 0	$ (1,172)	$ 0

Accumulated Other Comprehensi57

Accumulated Other Comprehensive Loss - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at December 31, 2014			$ 0
Change in net unrealized loss on securities available for sale	$ (341)	$ 0	(1,172)	$ 0
Balance at September 30, 2015	$ (1,172)		$ (1,172)

Employee Incentive and Retire58

Employee Incentive and Retirement Plans - Schedule of Stock-Based Compensation Expense Recorded for Stock Options, Warrants and Series F Convertible Preferred Stock (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation, net	$ 13,479	$ 10,537	$ 37,558	$ 25,889
Sales and marketing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,048	912	5,373	5,029
Origination and servicing
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	817	599	2,405	1,427
General and administrative: | Engineering and product development
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	2,554	1,492	6,392	3,487
General and administrative: | Other
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8,060	7,534	23,388	15,946
Stock options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	8,101	6,996	23,314	19,484
ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	491	0	1,416	0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	3,037	0	5,262	0
Stock issued related to acquisition
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 1,850	$ 3,541	$ 7,566	$ 6,405

Employee Incentive and Retire59

Employee Incentive and Retirement Plans - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option granted to purchase of common stock (shares)			1,164,929
Options granted, weighted average exercise price ($ per share)			$ 20
Options exercised (shares)			5,407,540	5,638,830
Total intrinsic values of options exercised			$ 75.3	$ 40.4
Total fair value of shares vested			$ 26	14.7
Expense related to accelerated vesting of stock options				3
Purchased by employees (number of shares)			211,256
Internally Developed Software
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense, capitalized amount	$ 1.3	$ 0.6	$ 3.1	$ 1.2
Stock Options
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option granted to purchase of common stock (shares)				18,511,572
Options granted, weighted average exercise price ($ per share)				$ 5.91
Common stock, weighted average grant date fair value per share ($ per share)			$ 9.80	$ 4.37
Options granted, total estimated fair value			$ 11.4	$ 81
Unrecognized compensation cost	100.8		$ 100.8
Unrecognized compensation cost expected period for recognition			2 years 7 months 6 days
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Unrecognized compensation cost expected period for recognition			3 years 7 months 6 days
RSUs granted (shares)			3,518,967
Aggregate fair value			$ 58.4
Unrecognized compensation cost	$ 54.3		$ 54.3
Available for ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Purchase period			6 months
Purchase price of common stock			85.00%
Total common stock authorized and reserved for future issuance (shares)	2,788,744		2,788,744
Requisite service period			6 months

Employee Incentive and Retire60

Employee Incentive and Retirement Plans - Black-Scholes Option Pricing Model to Estimate Fair Value of Stock Options Granted (Detail)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Weighted-average assumed stock price volatility	48.70%	50.50%	49.40%	54.00%
Weighted-average risk-free rate	1.67%	1.87%	1.61%	1.91%
Weighted-average expected life (in years)	6 years 3 months 1 day	6 years 3 months 1 day	6 years 3 months 1 day	6 years 4 months 18 days

Employee Incentive and Retire61

Employee Incentive and Retirement Plans - Options Activity Under Option Plan (Detail) - USD ($) $ / shares in Units, $ in Thousands	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Share Based Compensation Arrangement By Share Based Payment Award Options Outstanding Roll Forward
Balances, beginning balance, Number of Shares	57,386,829
Options Granted, Number of Shares	1,164,929
Options Exercised, Number of Shares	(5,407,540)	(5,638,830)
Options Forfeited/Expired, Number of Shares	(1,844,875)
Balances, ending balance, Number of Shares	51,299,343
Vested and expected to vest, Number of Shares	50,807,451
Exercisable, Number of Shares	26,216,233
Balances, beginning balance, Weighted Average Exercise Price Per Share	$ 3.15
Options Granted, Weighted Average Exercise Price Per Share	20
Options Exercised, Weighted Average Exercise Price Per Share	1.46
Options Forfeited/Expired, Weighted Average Exercise Price Per Share	6.45
Balances, ending balance, Weighted Average Exercise Price Per Share	3.59
Vested and expected to vest, Weighted Average Exercise Price Per Share	3.54
Exercisable, Weighted Average Exercise Per Share	$ 1.58
Outstanding, Weighted Average Remaining Contractual Life	7 years 3 months 18 days
Vested and expected to vest, Weighted Average Remaining Contractual Life	7 years 3 months 18 days
Exercisable, Weighted Average Remaining Contractual Life	6 years 6 months
Outstanding, Aggregate Intrinsic Value	$ 503,203
Vested and expected to vest, Aggregate Intrinsic Value	500,401
Exercisable, Aggregate Intrinsic Value	$ 306,781

Employee Incentive and Retire62

Employee Incentive and Retirement Plans - Restricted Stock Unit Activity and Weighted Average Grant Date Fair Value table (Details) - RSUs	9 Months Ended
	Sep. 30, 2015$ / sharesshares
Number of Shares (shares)
Unvested at December 31, 2014	0
RSUs granted	3,518,967
RSUs vested	(99,300)
RSUs forfeited/expired	(106,694)
Unvested at September 30, 2015	3,312,973
Expected to vest after September 30, 2015	3,177,419
Weighted- Average Grant Date Fair Value ($ per share)
Unvested at December 31, 2014 | $ / shares	$ 0
RSUs granted | $ / shares	16.60
RSUs vested | $ / shares	20.29
RSUs forfeited/expired | $ / shares	19.53
Unvested at September 30, 2015 | $ / shares	16.39
Expected to vest after September 30, 2015 | $ / shares	$ 16.42

Employee Incentive and Retire63

Employee Incentive and Retirement Plans - Black-Scholes Inputs for Employee Stock Purchase Plan (Details)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield	0.00%	0.00%	0.00%	0.00%
Weighted-average assumed stock price volatility	48.70%	50.50%	49.40%	54.00%
Weighted-average risk-free rate	1.67%	1.87%	1.61%	1.91%
Weighted-average expected life (in years)	6 years 3 months 1 day	6 years 3 months 1 day	6 years 3 months 1 day	6 years 4 months 18 days
Available for ESPP
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected dividend yield			0.00%
Weighted-average assumed stock price volatility			38.80%
Weighted-average risk-free rate			0.10%
Weighted-average expected life (in years)			5 months 2 days

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Tax Disclosure [Abstract]
Income tax expense	$ 1,233	$ 419	$ 2,249	$ 1,059
Valuation allowance	$ 41,300		$ 41,300

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) ft² in Thousands	Aug. 19, 2015USD ($)	Apr. 16, 2015renewal_option	Jun. 30, 2014	Sep. 30, 2015USD ($)ft²	Sep. 30, 2014USD ($)	Sep. 30, 2015USD ($)ft²	Sep. 30, 2014USD ($)	Dec. 31, 2014USD ($)
Commitments and Contingencies [Line Items]
Lease agreement renewal term		5 years
Number of renewal terms | renewal_option		2
Rental expense				$ 2,000,000	$ 1,000,000	$ 5,000,000	$ 2,500,000
Annual lease payments				1,500,000	$ 900,000	4,100,000	$ 2,200,000
Security deposit made under lease agreement				700,000		700,000
Payments due in 2015				1,900,000		1,900,000
Payments due in 2016				11,400,000		11,400,000
Payments due in 2017				14,100,000		14,100,000
Payments due in 2018				15,100,000		15,100,000
Payments due in 2019				14,600,000		14,600,000
Payments due thereafter				71,100,000		71,100,000
Total payments due				128,200,000		128,200,000
Participation interests to be purchased			100.00%
Remaining limit of contingent loan purchase commitment				32,200,000		32,200,000
Maximum cash pledged				5,000,000		5,000,000
Pledged and restricted to support contingent obligation				3,400,000		$ 3,400,000		$ 3,400,000
Loan purchase obligation period						2 days
Contingent loan purchase commitment limit				$ 14,000,000		$ 14,000,000		$ 4,100,000
Springstone Financial, Llc
Commitments and Contingencies [Line Items]
Restitution	$ 700,000
San Francisco
Commitments and Contingencies [Line Items]
Area of property (square feet) | ft²				155		155
Lease agreement expiration date						Jun. 1, 2022
Lease agreement renewal term						5 years
Westborough
Commitments and Contingencies [Line Items]
Area of property (square feet) | ft²				26		26

Segment Reporting (Details)

Segment Reporting (Details)	9 Months Ended
	Sep. 30, 2015segment
Segment Reporting [Abstract]
Number of reportable segments	1

Related Party Transactions - Su

Related Party Transactions - Summary of Deposits and Withdrawals Made by Related Parties (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Deposits and Withdrawals $120000 or More
Related Party Transaction [Line Items]
Deposits	$ 0	$ 500,000	$ 750,000	$ 1,650,000
Withdrawals	$ 99,000	$ 22,000	553,000	$ 132,000
Minimum
Related Party Transaction [Line Items]
Related party transaction threshold			$ 120,000

Springstone Acquisition - Summa

Springstone Acquisition - Summary of Pro Forma Financial Information (Detail) - Springstone Financial, Llc - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2014
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items]
Total net revenue	$ 56,074	$ 148,317
Net loss	$ (5,947)	$ (21,403)
Basic net loss per share attributable to common stockholders ($ per share)	$ (0.10)	$ (0.37)
Diluted net loss per share attributable to common stockholders ($ per share)	$ (0.10)	$ (0.37)