Organization and Summary of Significant Accounting Policies	3 Months Ended
Mar. 31, 2018
Accounting Policies [Abstract]
Organization and Summary of Significant Accounting Policies	Organization and Summary of Significant Accounting Policies On Deck Capital, Inc.’s principal activity is providing financing to small businesses located throughout the United States, as well as Canada and Australia, through term loans and lines of credit. We use technology and analytics to aggregate data about a business and then quickly and efficiently analyze the creditworthiness of the business using our proprietary credit-scoring model. We originate most of the loans in our portfolio and also purchase loans from an issuing bank partner. We subsequently transfer most of our loan volume into one of our wholly-owned subsidiaries and also have the option to sell them through OnDeck Marketplace®. Basis of Presentation and Principles of Consolidation We prepare our condensed consolidated financial statements and footnotes in accordance with accounting principles generally accepted in the United States of America, or GAAP, as contained in the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC. All intercompany transactions and accounts have been eliminated in consolidation. Certain reclassifications have been made to the prior year amounts to conform to the current year presentation. When used in these notes to condensed consolidated financial statements, the terms "we," "us," "our" or similar terms refers to On Deck Capital, Inc. and its consolidated subsidiaries. We consolidate the financial position and results of operations of these entities. The noncontrolling interest, which is presented as a separate component of our consolidated equity, represents the minority owners' proportionate share of the equity of the jointly owned entities. The noncontrolling interest is adjusted for the minority owners' share of the earnings, losses, investments and distributions. Use of Estimates The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts in the condensed consolidated financial statements and accompanying notes. Significant estimates include allowance for loan losses, stock-based compensation expense, capitalized software development costs, the useful lives of long-lived assets, servicing assets/liabilities, loans purchased, and valuation allowance for deferred tax assets. We base our estimates on historical experience, current events and other factors we believe to be reasonable under the circumstances. These estimates and assumptions are inherently subjective in nature; actual results may differ from these estimates and assumptions. Recently Adopted Accounting Standards In May 2014, the FASB issued ASU 2014-09, Revenue Recognition, which creates ASC 606, Revenue from Contracts with Customers, and supersedes ASC 605, Revenue Recognition. ASU 2014-09 requires revenue to be recognized in an amount that reflects the consideration to which the entity expects to be entitled in exchange for goods or services and also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows from customer contracts. The FASB subsequently issued numerous amendments including ASU 2016-08 - Principal versus Agent Considerations, ASU 2016-10 - Identifying Performance Obligations and Licensing, and ASU 2016-12 - Narrow-Scope Improvements and Practical Expedients. Each amendment has the same effective date and transition requirements as the new revenue recognition standard. We adopted the new standard effective January 1, 2018 and applied the modified retrospective method of adoption. The adoption of ASC 606 did not have a material effect on our condensed consolidated financial statements and disclosures, nor did it result in a cumulative effect adjustment at the date of initial application. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. ASU 2016-18 intends to reduce diversity in practice for the classification and presentation of changes in restricted cash on the statement of cash flows. ASU 2016-18 clarifies that transfers between cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents are not part of the entity’s operating, investing, and financing activities, and details of those transfers should not be reported as cash flow activities in the statement of cash flows. It requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. We adopted the new standard effective January 1, 2018 and no longer present restricted cash as a reconciling item in our consolidated statement of cash flows. For the three months ended March 31, 2017, cash flows from investing activities increased $20.2 million and the net decrease in cash and cash equivalents of $6.6 million became a net increase in cash, cash equivalents and restricted cash of $13.6 million. Recent Accounting Pronouncements Not Yet Adopted In February 2016, the FASB issued ASU 2016-02, Leases, which creates ASC 842, Leases, and supersedes ASC 840, Leases. ASU 2016-02 requires lessees to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The new guidance will be effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period and is applied retrospectively. Early adoption is permitted. We are currently assessing the impact that the adoption of this guidance will have on our consolidated financial statements. In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. ASU 2016-13 will change the impairment model and how entities measure credit losses for most financial assets. The standard requires entities to use the new expected credit loss impairment model which will replace the incurred loss model used today. The new guidance will be effective for annual reporting periods beginning after December 15, 2019. Early adoption is permitted, but not prior to December 15, 2018. We are currently assessing the impact that the adoption of this guidance will have on our consolidated financial statements.

Organization and Summary of Significant Accounting Policies

On Deck Capital, Inc.’s principal activity is providing financing to small businesses located throughout the United States, as well as Canada and Australia, through term loans and lines of credit. We use technology and analytics to aggregate data about a business and then quickly and efficiently analyze the creditworthiness of the business using our proprietary credit-scoring model. We originate most of the loans in our portfolio and also purchase loans from an issuing bank partner. We subsequently transfer most of our loan volume into one of our wholly-owned subsidiaries and also have the option to sell them through OnDeck Marketplace®.

Basis of Presentation and Principles of Consolidation

We prepare our condensed consolidated financial statements and footnotes in accordance with accounting principles generally accepted in the United States of America, or GAAP, as contained in the Financial Accounting Standards Board, or FASB, Accounting Standards Codification, or ASC. All intercompany transactions and accounts have been eliminated in consolidation. Certain reclassifications have been made to the prior year amounts to conform to the current year presentation. When used in these notes to condensed consolidated financial statements, the terms "we," "us," "our" or similar terms refers to On Deck Capital, Inc. and its consolidated subsidiaries.

We consolidate the financial position and results of operations of these entities. The noncontrolling interest, which is presented as a separate component of our consolidated equity, represents the minority owners' proportionate share of the equity of the jointly owned entities. The noncontrolling interest is adjusted for the minority owners' share of the earnings, losses, investments and distributions.

Use of Estimates

The preparation of financial statements in conformity with GAAP requires us to make estimates and assumptions that affect the reported amounts in the condensed consolidated financial statements and accompanying notes. Significant estimates include allowance for loan losses, stock-based compensation expense, capitalized software development costs, the useful lives of long-lived assets, servicing assets/liabilities, loans purchased, and valuation allowance for deferred tax assets. We base our estimates on historical experience, current events and other factors we believe to be reasonable under the circumstances. These estimates and assumptions are inherently subjective in nature; actual results may differ from these estimates and assumptions.

Recently Adopted Accounting Standards

In May 2014, the FASB issued ASU 2014-09, Revenue Recognition, which creates ASC 606, Revenue from Contracts with Customers, and supersedes ASC 605, Revenue Recognition. ASU 2014-09 requires revenue to be recognized in an amount that reflects the consideration to which the entity expects to be entitled in exchange for goods or services and also requires additional disclosure about the nature, amount, timing, and uncertainty of revenue and cash flows from customer contracts. The FASB subsequently issued numerous amendments including ASU 2016-08 - Principal versus Agent Considerations, ASU 2016-10 - Identifying Performance Obligations and Licensing, and ASU 2016-12 - Narrow-Scope Improvements and Practical Expedients. Each amendment has the same effective date and transition requirements as the new revenue recognition standard. We adopted the new standard effective January 1, 2018 and applied the modified retrospective method of adoption. The adoption of ASC 606 did not have a material effect on our condensed consolidated financial statements and disclosures, nor did it result in a cumulative effect adjustment at the date of initial application.

In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash. ASU 2016-18 intends to reduce diversity in practice for the classification and presentation of changes in restricted cash on the statement of cash flows. ASU 2016-18 clarifies that transfers between cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents are not part of the entity’s operating, investing, and financing activities, and details of those transfers should not be reported as cash flow activities in the statement of cash flows. It requires that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. We adopted the new standard effective January 1, 2018 and no longer present restricted cash as a reconciling item in our consolidated statement of cash flows. For the three months ended March 31, 2017, cash flows from investing activities increased $20.2 million and the net decrease in cash and cash equivalents of $6.6 million became a net increase in cash, cash equivalents and restricted cash of $13.6 million.

Recent Accounting Pronouncements Not Yet Adopted

In February 2016, the FASB issued ASU 2016-02, Leases, which creates ASC 842, Leases, and supersedes ASC 840, Leases. ASU 2016-02 requires lessees to recognize a right-of-use asset and lease liability for all leases with terms of more than 12 months. Recognition, measurement and presentation of expenses will depend on classification as a finance or operating lease. The new guidance will be effective for annual reporting periods beginning after December 15, 2018, including interim periods within that reporting period and is applied retrospectively. Early adoption is permitted. We are currently assessing the impact that the adoption of this guidance will have on our consolidated financial statements.

In June 2016, the FASB issued ASU 2016-13, Measurement of Credit Losses on Financial Instruments. ASU 2016-13 will change the impairment model and how entities measure credit losses for most financial assets. The standard requires entities to use the new expected credit loss impairment model which will replace the incurred loss model used today. The new guidance will be effective for annual reporting periods beginning after December 15, 2019. Early adoption is permitted, but not prior to December 15, 2018. We are currently assessing the impact that the adoption of this guidance will have on our consolidated financial statements.