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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Class of Stock Disclosures [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | The following common stock is reserved for future issuance at December 31(1) (in thousands):
|  | December 31, |  |  | December 31, |
|  | 2021 |  |  | 2020 |
Warrants issued and outstanding |  |  | — |  |  |  | 51 |
Stock option awards issued and outstanding |  |  | 2,000 |  |  |  | 1,760 |
Authorized for grants under the 2016 Equity Incentive Plan(2) |  |  | 332 |  |  |  | 357 |
Authorized for grants under the Inducement Plan(3) |  |  | 81 |  |  |  | — |
Authorized for grants under the 2016 Employee Stock Purchase Plan(4) |  |  | 326 |  |  |  | 256 |
|  |  | 2,739 |  |  |  | 2,424 |
(1) Treasury stock of 541,000 and 534,000 shares as of December 31, 2021 and 2020, respectively, are excluded from the table above. (2) On January 1, 2021, the number of authorized shares in the 2016 Plan increased by 391,000 shares pursuant to the evergreen provisions of the 2016 Equity Incentive Plan. (3) On February 5, 2021, 300,000 shares were authorized pursuant to the terms of the Inducement Plan; 225,500 shares were issued under the Inducement Plan during the year ended December 31, 2021 On January 1, 2021, the number of authorized shares in the 2016 Employee Stock Purchase Plan increased by 98,000 shares pursuant to the evergreen provisions of the 2016 Employee Stock Purchase Plan.

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