Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Revenue:
Interest income	$ 264,844	$ 195,048	$ 145,275
Gain on sales of loans	14,411	53,354	8,823
Other revenue	12,062	6,365	3,966
Gross revenue	291,317	254,767	158,064
Cost of revenue:
Provision for loan losses	149,963	74,863	67,432
Funding costs	32,448	20,244	17,200
Total cost of revenue	182,411	95,107	84,632
Net revenue	108,906	159,660	73,432
Operating expense:
Sales and marketing	67,011	60,575	33,201
Technology and analytics	58,899	42,653	17,399
Processing and servicing	19,719	13,053	8,230
General and administrative	48,345	45,304	21,680
Total operating expense	193,974	161,585	80,510
Loss from operations	(85,068)	(1,925)	(7,078)
Other expense:
Interest expense	(414)	(306)	(398)
Warrant liability fair value adjustment	0	0	(11,232)
Total other expense	(414)	(306)	(11,630)
Loss before provision for income taxes	(85,482)	(2,231)	(18,708)
Provision for income taxes	0	0	0
Net loss	(85,482)	(2,231)	(18,708)
Accretion of dividends on redeemable convertible preferred stock	0	0	(12,884)
Less: net loss attributable to noncontrolling interest	2,524	958	0
Net loss attributable to On Deck Capital, Inc. common stockholders	$ (82,958)	$ (1,273)	$ (31,592)
Net loss per share attributable to On Deck Capital, Inc. common shareholders:
Basic and diluted (in dollars per share)	$ (1.17)	$ (0.02)	$ (0.60)
Weighted-average common shares outstanding:
Basic and diluted (in shares)	70,934,937	69,545,238	52,556,998
Comprehensive loss:
Foreign currency translation adjustment	$ (20)	$ (678)	$ 0
Comprehensive loss	(85,502)	(2,909)	(18,708)
Comprehensive loss attributable to noncontrolling interests	13	306	0
Net loss attributable to noncontrolling interest	2,524	958	0
Comprehensive loss attributable to On Deck Capital, Inc. common stockholders	$ (82,965)	$ (1,645)	$ (18,708)