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Stockholder's equity (deficit) (Tables)

3 Months Ended

Mar. 31, 2021

Stockholder’s equity (deficit)

Schedule of common stock reserved for issuance

		March 31, 2021		December 31, 2020
Options outstanding under the 2018 Stock Option and Grant Plan		2,119,349		2,148,019
Options outstanding under the 2019 Stock Option and Incentive Plan		1,758,356		1,585,293
Options available for future grant		3,344,146		2,127,544
2019 Employee Stock Purchase Plan		891,379		543,963
Total		8,113,230		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		(14,889)			0.62
Unvested restricted common stock as of March 31, 2021		18,725		$	0.62

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