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Preferred Stock and Common Stock (Tables) | 3 Months Ended
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Mar. 31, 2019
Temporary Equity Disclosure [Abstract] |
Schedule of Number of Shares of Common Stock Reserved for Future Issuance Text Block | 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, 2019 |  |  | December 31, 2018 |
Options issued and outstanding |  |  | 1,706,317 |  |  |  | 1,122,677 |
Unvested restricted stock units |  |  | 24,960 |  |  |  | 24,960 |
Options available for future grants |  |  | 1,889,155 |  |  |  | 1,350,582 |
Shares available for issuance under the 2018 ESPP |  |  | 555,583 |  |  |  | 275,030 |
Total |  |  | 4,176,015 |  |  |  | 2,773,249 |

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