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Common Stock (Tables) | 12 Months Ended
--- | ---
Dec. 31, 2020
Common Stock. |
Schedule of reserved common stock | ​
​ | ​ | ​
​ | ​ | As of
​ | ​ | December 31,
​ |  | 2020
Common shares reserved for exercise of pre-funded warrants | ​ | 2,179,487
Common shares reserved for future issuance under the 2018 ESPP | ​ | 795,849
Common shares reserved for exercise of outstanding stock options under the 2017 and 2018 Plans | ​ | 3,679,931
Common shares reserved for future issuance under the 2018 Plan | ​ | 1,962,992
​ | ​ | 8,618,259

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