Unaudited Condensed Consolidated Statements of Operations and Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue:
Interest income	$ 92,371	$ 83,721	$ 178,740	$ 170,832
Gain on sales of loans	0	260	0	1,744
Other revenue	3,247	2,670	7,158	6,967
Gross revenue	95,618	86,651	185,898	179,543
Cost of revenue:
Provision for loan losses	33,293	32,733	69,586	78,913
Funding costs	12,202	11,616	24,023	22,893
Total cost of revenue	45,495	44,349	93,609	101,806
Net revenue	50,123	42,302	92,289	77,737
Operating expense:
Sales and marketing	11,432	15,368	22,030	30,187
Technology and analytics	12,799	14,769	23,806	30,212
Processing and servicing	5,041	4,826	10,262	9,361
General and administrative	16,034	9,590	33,759	21,477
Total operating expense	45,306	44,553	89,857	91,237
Income (loss) from operations	4,817	(2,251)	2,432	(13,500)
Other expense:
Interest expense	43	318	94	671
Total other expense	43	318	94	671
Income (loss) before provision for income taxes	4,774	(2,569)	2,338	(14,171)
Provision for income taxes	0	0	0	0
Net income (loss)	4,774	(2,569)	2,338	(14,171)
Less: Net income (loss) attributable to noncontrolling interest	(1,016)	(1,071)	(1,535)	(1,615)
Net income (loss) attributable to On Deck Capital, Inc. common stockholders	$ 5,790	$ (1,498)	$ 3,873	$ (12,556)
Net income (loss) per share attributable to On Deck Capital, Inc. common shareholders:
Basic (in dollars per share)	$ 0.08	$ (0.02)	$ 0.05	$ (0.17)
Diluted (in dollars per share)	$ 0.07	$ (0.02)	$ 0.05	$ (0.17)
Weighted-average common shares outstanding:
Basic (in shares)	74,385,446	72,688,815	74,182,929	72,276,734
Diluted (in shares)	78,288,267	72,688,815	77,786,748	72,276,734
Comprehensive income (loss):
Net income (loss)	$ 4,774	$ (2,569)	$ 2,338	$ (14,171)
Foreign currency translation adjustment	(396)	36	(509)	436
Comprehensive income (loss)	4,378	(2,533)	1,829	(13,735)
Less: Comprehensive income (loss) attributable to noncontrolling interests	(178)	16	(229)	196
Less: Net income (loss) attributable to noncontrolling interest	(1,016)	(1,071)	(1,535)	(1,615)
Comprehensive income (loss) attributable to On Deck Capital, Inc. common stockholders	$ 5,572	$ (1,478)	$ 3,593	$ (12,316)