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Common Stock (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Common Stock |
Schedule of shares reserved for future issuance | ​
​ | ​ | ​ | ​ | ​
​ |  | As of December 31,
​ |  | 2020 |  | 2019
Shares reserved for outstanding stock option awards under the 2013 Stock Incentive Plan, as amended |  | 174,362 |  | 312,342
Shares reserved for outstanding stock option awards and restricted stock units under the 2015 Stock Incentive Plan |  | 3,839,345 |  | 4,254,357
Shares reserved for outstanding inducement stock option award |  | 280,000 |  | 175,000
Remaining shares reserved, but unissued, for future awards under the 2015 Stock Incentive Plan |  | 5,599,450 |  | 4,061,357
Remaining shares reserved, but unissued, for future awards under the 2015 Employee Stock Purchase Plan |  | 2,137,127 | ​ | 1,630,199
​ | ​ | 12,030,284 |  | 10,433,255

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