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Stockholders' Equity (Tables) | 12 Months Ended
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Dec. 31, 2018
Class Of Stock Disclosures [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | The following common stock is reserved for future issuance at December 31, 2018 and 2017 :
|  | As of December 31, |
|  | 2018 |  |  | 2017 |
Warrants issued and outstanding |  |  | 51,003 |  |  |  | 51,003 |
Stock option awards issued and outstanding |  |  | 1,407,049 |  |  |  | 1,203,627 |
Authorized for grants under the 2016 Equity Incentive Plan |  |  | 463,491 |  |  |  | 633,052 |
Authorized for grants under the 2016 Employee Stock Purchase Plan |  |  | 100,000 |  |  |  | 100,000 |
|  |  | 2,021,543 |  |  |  | 1,987,682 |
(1) | Treasury stock in the amount of 357,314 and 135,000 as of December 31, 2018 and 2017, respectively, are excluded from the table above.

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