Consolidated Statements of Operations - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Operating revenue:
Transaction fees		$ 373,508	$ 197,124	$ 85,830
Servicing fees		32,811	11,534	3,951
Management fees		10,976	5,957	3,083
Other revenue (expense)		9,402	(1,203)	5,111
Total operating revenue		426,697	213,412	97,975
Net interest income (expense):
Total interest income		552,972	354,453	187,507
Total interest expense		(549,740)	(356,615)	(187,447)
Net interest income (expense)		3,232	(2,162)	60
Fair value adjustments, loans, notes and certificates		14	(122)	(33)
Net interest income (expense) and fair value adjustments		3,246	(2,284)	27
Total net revenue		429,943	211,128	98,002
Operating expenses:
Sales and marketing	[1]	171,526	85,652	37,431
Origination and servicing	[1]	61,335	37,326	17,978
Engineering and product development	[1]	77,062	38,518	15,528
Other general and administrative	[1]	122,182	81,136	19,757
Total operating expenses	[1]	432,105	242,632	90,694
Income (loss) before income tax expense		(2,162)	(31,504)	7,308
Income tax expense		2,833	1,390	0
Net income (loss)		$ (4,995)	$ (32,894)	$ 7,308
Basic net loss per share attributable to common stockholders ($ per share)		$ (0.01)	$ (0.44)	$ 0.00
Diluted net loss per share attributable to common stockholders ($ per share)		$ (0.01)	$ (0.44)	$ 0.00
Weighted-average common shares - Basic (shares)		374,872,118	75,573,742	51,557,136
Weighted-average common shares - Diluted (shares)		374,872,118	75,573,742	81,426,976

[1] Prior period amounts have been reclassified to conform to the current period presentation. See “Note 1. Basis of Presentation” for additional information.