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Common Stock (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Stockholders' Equity Note [Abstract] |  |
Schedule of Number of Shares of Common Stock Reserved for Future Issuance | The Company has reserved the following number of shares of common stock for future issuance upon the exercise of options, vesting of restricted stock units or grant of equity awards:
|  | March 31, 2020 |  |  | December 31, 2019 |
Options issued and outstanding |  |  | 2,302,435 |  |  |  | 2,562,800 |
Unvested restricted stock units |  |  | 753,863 |  |  |  | 828,935 |
Options available for future grants |  |  | 2,007,250 |  |  |  | 215,043 |
Shares available for issuance under the 2018 ESPP |  |  | 920,030 |  |  |  | 555,583 |
Total |  |  | 5,983,578 |  |  |  | 4,162,361 |
| As of December 31, 2019 and 2018, the Company has reserved the following number of shares of common stock for future issuance upon the exercise of options, vesting of restricted stock units or grant of equity awards:
|  | As of December 31, |
|  | 2019 |  |  | 2018 |
Options issued and outstanding |  |  | 2,562,800 |  |  |  | 1,122,677 |
Unvested restricted stock units |  |  | 828,935 |  |  |  | 24,960 |
Options available for future grants |  |  | 212,308 |  |  |  | 1,350,582 |
Shares available for issuance under the 2018 ESPP |  |  | 555,583 |  |  |  | 275,030 |
Total |  |  | 4,159,626 |  |  |  | 2,773,249 |

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