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Stockholder's equity (deficit) (Tables)

9 Months Ended

Sep. 30, 2021

Stockholder's equity (deficit)

Schedule of common stock reserved for issuance

The following shares of common stock were reserved for issuance as follows:

​

​	​	​	​	​
​	​	September 30, 2021	​	December 31, 2020
Options outstanding under the 2018 Stock Option and Grant Plan		2,028,496		2,148,019
Options outstanding under the 2019 Stock Option and Incentive Plan		2,003,556		1,585,293
Options available for future grant		3,094,946		2,127,544
Common stock available for ATM program	​	5,000,000	​	—
2019 Employee Stock Purchase Plan		881,249		543,963
Total		13,008,247		6,404,819

Summary of restricted stock activity

​

​	​	​	​	​	​
​	​	​	​	Grant-Date Fair
​		Number of Shares		Value
Unvested restricted common stock as of December 31, 2020	​	33,614	​	$	0.62
Shares vesting	​	(33,614)	​	​	0.62
Unvested restricted common stock as of September 30, 2021		—	​	​	-

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Tabular disclosure of reserved shares of common stock, on an as-if converted basis.

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Tabular disclosure of the change in restricted stock units (RSUs).

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