Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities:
Net loss	$ (6,374)	$ (7,299)
Adjustments to reconcile net loss to net cash provided by operating activities:
Net fair value adjustments of loans, notes and certificates	5	32
Change in loan servicing liabilities	424	285
Change in loan servicing assets	(1,315)	(330)
Stock-based compensation, net	11,593	7,033
Depreciation and amortization	4,693	1,007
Loss (gain) on sales of loans	(95)	71
Other, net	18	5
Purchase of whole loans to be sold	(622,050)	(265,653)
Proceeds from sales of whole loans	622,145	265,582
Net change in operating assets and liabilities:
Accrued interest receivable	(2,315)	(1,453)
Other assets	(2,074)	18,070
Due from related parties	(57)	(24)
Accounts payable	(1,812)	(131)
Accrued interest payable	2,719	1,667
Accrued expenses and other liabilities	990	1,232
Net cash provided by operating activities	6,495	20,094
Cash flows from investing activities:
Purchase of loans	(852,827)	(511,219)
Principal payments received from loans	369,379	204,950
Proceeds from recoveries and sales of charged-off loans	3,472	744
Net change in restricted cash	7,516	(3,759)
Purchase of property, equipment and software	(6,240)	(5,005)
Net cash used in investing activities	(478,700)	(314,289)
Cash flows from financing activities:
Change in payable to investors	(7,924)	3,672
Proceeds from issuances of notes and certificates	852,715	510,962
Principal payments on notes and certificates	(365,711)	(205,274)
Payments on notes and certificates from recoveries/sales of related charged-off loans	(3,461)	(734)
Change in equity offering costs	65	0
Proceeds from stock option exercises	863	780
Proceeds from exercise of warrants to acquire common stock	3	89
Net cash provided by financing activities	476,550	309,495
Net increase in cash and cash equivalents	4,345	15,300
Cash and cash equivalents, beginning of period	869,780	49,299
Cash and cash equivalents, end of period	874,125	64,599
Supplemental disclosure of cash flow information:
Cash paid for interest	110,562	71,296
Non-cash investing activity - Accruals for property, equipment and software	1,184	385
Non-cash financing activity - Accruals for prepaid offering costs	296	0
Non-cash financing activity - Reclassification of early-exercise liability relating to stock options	$ 108	$ 174