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Convertible Preferred Stock and Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2019
Equity [Abstract] |
Schedule of Common Stock Reserved | The following table shows shares of common stock reserved as of:
|  | December 31 |
|  | 2019 |  |  | 2018 |
Shares subject to options to purchase common stock |  |  | 2,645,714 |  |  |  | 1,320,197 |
Unvested restricted stock units |  |  | 249,500 |  |  |  | — |
Shares subject to warrants to purchase common stock |  |  | 956 |  |  |  | 156,294 |
Shares subject to term debt optional conversion into common stock |  |  | 761,186 |  |  |  | 1,099,278 |
Total |  |  | 3,657,356 |  |  |  | 2,575,769 |

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