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Convertible Preferred Stock and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2020
Equity [Abstract] |
Schedule of Common Stock Reserved | The following table shows shares of common stock reserved as of:
|  | December 31 |
|  | 2020 |  |  | 2019 |
Shares subject to options to purchase common stock |  |  | 1,443,940 |  |  |  | 2,645,714 |
Unvested restricted stock units |  |  | 2,691,375 |  |  |  | 249,500 |
Shares subject to warrants to purchase common stock |  |  | 29 |  |  |  | 956 |
Shares subject to term debt optional conversion into common stock |  |  | — |  |  |  | 761,186 |
Total |  |  | 4,135,344 |  |  |  | 3,657,356 |

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