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)	$ 0.00	$ (0.12)	$ (0.03)	$ (0.41)
Diluted net income (loss) per share attributable to common stockholders ($ per share)	$ 0.00	$ (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