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Stockholders' Equity (Tables) | 3 Months Ended
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Mar. 31, 2022
Class of Stock Disclosures [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | The following table presents common stock reserved for future issuance(1) (in thousands):
| March 31, 2022 |  | December 31, 2021 |
Stock option awards issued and outstanding |  | 2,175 |  |  | 2,000 |
Authorized for grants under the 2016 Equity Incentive Plan(2) |  | 491 |  |  | 332 |
Authorized for grants under the Inducement Plan(3) |  | 47 |  |  | 81 |
Authorized for grants under the 2016 Employee Stock Purchase Plan(4) |  | 395 |  |  | 326 |
|  | 3,108 |  |  | 2,739 |

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