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Common Stock (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2021
Common Stock. |
Schedule of reserved common stock | ​
​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31,
​ |  | 2021
Common shares reserved for exercise of pre-funded warrants | ​ | 2,179,487
Common shares reserved for future issuance under the 2018 ESPP | ​ | 1,137,373
Common shares reserved for exercise of outstanding stock options under the 2017 and 2018 Plans | ​ | 3,743,400
Common shares reserved for future issuance under the 2018 Plan | ​ | 2,394,091
Common shares reserved for unvested restricted stock units under the 2018 Plan | ​ | 314,901
​ | ​ | 9,769,252

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