Unaudited Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014
Cash flows from operating activities
Net loss	$ (5,343)us-gaap_NetIncomeLoss	$ (13,717)us-gaap_NetIncomeLoss
Adjustments to reconcile net loss to net cash provided by operating activities:
Provision for loan losses	23,101us-gaap_ProvisionForLoanAndLeaseLosses	16,579us-gaap_ProvisionForLoanAndLeaseLosses
Depreciation and amortization	1,378	878
Amortization of debt issuance costs	688us-gaap_AmortizationOfFinancingCosts	667us-gaap_AmortizationOfFinancingCosts
Stock-based compensation	2,042us-gaap_ShareBasedCompensation	233us-gaap_ShareBasedCompensation
Warrant liability fair value adjustment	0us-gaap_FairValueAdjustmentOfWarrants	6,632us-gaap_FairValueAdjustmentOfWarrants
Amortization of net deferred origination costs	9,275	5,572
Provision for unfunded loan commitment	438ondk_ProvisionforUnfundedLoanCommitment	32ondk_ProvisionforUnfundedLoanCommitment
Common stock warrant issuance	0	64
Changes in operating assets and liabilities:
Other assets	(4,483)	(565)
Accounts payable	2,172	(336)
Interest payable	(38)	(163)
Accrued expenses and other liabilities	117	183
Originations of loans held for sale	(93,926)	(31,011)
Sales of loans held for sale	92,059	29,351
Repayments of term loans held for sale	693	338
Net cash provided by operating activities	28,173	14,737
Cash flows from investing activities
Change in restricted cash	3,396	(2,025)
Purchases of property, equipment and software	(1,606)	(1,509)
Capitalized internal-use software	(1,069)us-gaap_PaymentsToDevelopSoftware	(519)us-gaap_PaymentsToDevelopSoftware
Originations of term loans and lines of credit, excluding rollovers into new originations	(262,563)	(167,627)
Capitalized net deferred origination costs	(9,246)	(8,465)
Principal repayments of term loans and lines of credit	194,108	95,175
Net cash used in investing activities	(76,980)	(84,970)
Cash flows from financing activities
Proceeds from exercise of stock options	150	179
Payments of initial public offering costs	(1,845)us-gaap_PaymentsOfStockIssuanceCosts	0us-gaap_PaymentsOfStockIssuanceCosts
Redemption of common stock	(184)	0
Proceeds from the issuance of redeemable convertible preferred stock	0	77,000
Proceeds from the issuance of funding debt	36,865us-gaap_ProceedsFromIssuanceOfDebt	79,298us-gaap_ProceedsFromIssuanceOfDebt
Payments of debt issuance costs	(7)us-gaap_PaymentsOfDebtIssuanceCosts	(4)us-gaap_PaymentsOfDebtIssuanceCosts
Net cash (used in) provided by financing activities	(3,424)	87,671
Net increase (decrease) in cash and cash equivalents	(52,231)	17,438
Cash and cash equivalents at beginning of period	220,433	4,670
Cash and cash equivalents at end of period	168,202	22,108
Supplemental disclosure of other cash flow information
Cash paid for interest	4,234us-gaap_InterestPaid	4,067us-gaap_InterestPaid
Supplemental disclosures of non-cash investing and financing activities
Stock-based compensation included in capitalized internal-use software	160	20
Unpaid principal balance of term loans rolled into new originations	59,488	28,712
Accretion of dividends on redeemable convertible preferred stock	0	2,605
Funding Debt [Member]
Cash flows from financing activities
Repayment of debt	(26,403)	(56,802)
Corporate Debt [Member]
Cash flows from financing activities
Repayment of debt	$ (12,000)	$ (12,000)

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-Publisher FASB

-Name Accounting Standards Codification

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The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt.

+ References

No definition available.

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The cash inflow from issuance of callable preferred stock which is identified as being convertible to another type of financial security at the option of the issuer or the holder.

+ References

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The cash inflow from repayments of the balance excluding interest (principal) on loans receivable and leases held for investment purposes.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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- Definition

The cash inflow resulting from the sale of loans classified as held-for-sale, including proceeds from loans sold through mortgage securitization.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

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The cash inflow associated with the amount received from holders exercising their stock options. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

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-Publisher FASB

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Amount of expense related to estimated loss from loan and lease transactions.

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The cash outflow during the period from the repayment of aggregate short-term and long-term debt. Excludes payment of capital lease obligations.

+ References

No definition available.

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

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Accretion of temporary equity during the period due to cash, stock, and in-kind dividends. This item is an adjustment to net income necessary to derive net income apportioned to common stockholders and is to be distinguished from Temporary Equity, Accretion of Dividends (Temporary Equity, Accretion of Dividends).

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No definition available.

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