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Stockholders' Equity (Tables) | 6 Months Ended
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Jun. 30, 2018
Class Of Stock Disclosures [Abstract] |
Schedule of Common Stock Reserved for Future Issuance | The following common stock is reserved for future issuance at June 30, 2018 and December 31, 2017:
|  | June 30, 2018 (1) |  |  | December 31, 2017 (1) |
Warrants issued and outstanding |  |  | 51,003 |  |  |  | 51,003 |
Stock option awards issued and outstanding |  |  | 1,955,875 |  |  |  | 1,203,627 |
Authorized for grants under the 2016 Equity Incentive Plan |  |  | 123,989 |  |  |  | 633,052 |
Authorized for grants under the 2016 Employee Stock Purchase Plan |  |  | 100,000 |  |  |  | 100,000 |
|  |  | 2,230,867 |  |  |  | 1,987,682 |
| (1) | Treasury stock in the amount of 285,528 and 135,000 as of June 30, 2018 and December 31, 2017, respectively, are excluded from the table above.

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