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Preferred Stock | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
Temporary Equity Disclosure [Abstract] |  |
Preferred Stock | 8. Preferred Stock and Common Stock As of March 31, 2020, the Company had 10,000,000 shares of preferred stock authorized and none issued and outstanding. Reserve 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 |
| 8. Preferred Stock As of December 31, 2019 and 2018, the Company had 10,000,000 shares of preferred stock authorized and none was issued and outstanding.

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