Stockholders' Equity - Shares Available for Future Issuance (Details) - shares |
Dec. 31, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Stockholders' Equity | ||
| Employee stock purchase plan (in shares) | 225,806 | |
| Warrants outstanding (in shares) | 295,591 | |
| Total shares of common stock reserved for future issuance (in shares) | 18,163,259 | |
| 2013 plan | ||
| Stockholders' Equity | ||
| Stock options outstanding (in shares) | 9,317,019 | |
| Shares available for future grant (in shares) | 4,053,501 | 4,394,301 |
| 2013 plan | Restricted Stock Units | ||
| Stockholders' Equity | ||
| Stock options outstanding (in shares) | 3,771,342 | |
| Inducement Plan | ||
| Stockholders' Equity | ||
| Stock options outstanding (in shares) | 247,500 | |
| Shares available for future grant (in shares) | 252,500 | 205,000 |
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- Definition Represents the number of common shares reserved for issuance in the employee stock purchase plan. No definition available.
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Number of warrants or rights outstanding. No definition available.
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- Definition Aggregate number of common shares reserved for future issuance. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Number of options outstanding, including both vested and non-vested options. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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