Unaudited Condensed Consolidated Statements of Cash Flows - USD ($)	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Cash flows from operating activities
Net income (loss)	$ 2,912,000	$ (14,417,000)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Provision for loan losses	54,865,000	47,011,000
Depreciation and amortization	4,621,000	2,848,000
Amortization of debt issuance costs	2,130,000	2,010,000
Stock-based compensation	8,065,000	1,447,000
Loss on disposal	0	774,000
Warrant liability fair value adjustment	0	9,127,000
Amortization of net deferred origination costs	26,041,000	19,366,000
Gain on sales of loans	(35,178,000)	(4,569,000)
Provision for unfunded loan commitment	1,915,000	151,000
Common stock warrant issuance	0	64,000
Gain on extinguishment of debt	(182,000)	0
Changes in operating assets and liabilities:
Other assets	(11,053,000)	(3,986,000)
Accounts payable	59,000	2,584,000
Interest payable	(124,000)	(403,000)
Accrued expenses and other liabilities	10,313,000	3,894,000
Originations of loans held for sale	(314,134,000)	(77,000,000)
Payments of net deferred origination costs of loans held for sale	(12,142,000)	(3,985,000)
Proceeds from sale of loans held for sale	342,825,000	83,536,000
Principal repayments of loans held for sale	8,757,000	788,000
Net cash provided by operating activities	89,690,000	69,240,000
Cash flows from investing activities
Change in restricted cash	(6,061,000)	(7,773,000)
Purchases of property, equipment and software	(5,115,000)	(7,411,000)
Capitalized internal-use software	(3,219,000)	(2,137,000)
Originations of term loans and lines of credit, excluding rollovers into new originations	(809,319,000)	(605,332,000)
Proceeds from sale of loans held for investment	106,007,000	0
Payments of net deferred origination costs	(20,578,000)	(24,151,000)
Principal repayments of term loans and lines of credit	639,918,000	372,550,000
Net cash used in investing activities	(98,367,000)	(274,254,000)
Cash flows from financing activities
Proceeds from exercise of stock options and warrants	227,000	4,044,000
Payments of initial public offering costs	(1,845,000)	0
Purchase of shares for treasury	(184,000)	0
Investment by noncontrolling interest	7,069,000	0
Proceeds from the issuance of redeemable convertible preferred stock	0	77,000,000
Proceeds from the issuance of funding debt	159,557,000	428,535,000
Payments of debt issuance costs	(1,185,000)	(4,964,000)
Net cash (used in) provided by financing activities	(44,479,000)	222,986,000
Effect of exchange rate changes on cash and cash equivalents	(1,564,000)	0
Net (decrease) increase in cash and cash equivalents	(54,720,000)	17,972,000
Cash and cash equivalents at beginning of period	220,433,000	4,670,000
Cash and cash equivalents at end of period	165,713,000	22,642,000
Supplemental disclosure of other cash flow information
Cash paid for interest	11,739,000	10,966,000
Supplemental disclosures of non-cash investing and financing activities
Stock-based compensation included in capitalized internal-use software	597,000	159,000
Loans transferred from loans held for sale to loans	1,348,000	0
Accrued deferred offering costs	0	1,350,000
Unpaid principal balance of term loans rolled into new originations	194,218,000	105,974,000
Accretion of dividends on redeemable convertible preferred stock	0	9,828,000
Funding debt
Cash flows from financing activities
Repayment of debt principal	(196,118,000)	(269,629,000)
Corporate debt
Cash flows from financing activities
Repayment of debt principal	$ (12,000,000)	$ (12,000,000)