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