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Stock based awards - Stock-based compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended			3 Months Ended
	Jul. 31, 2019	Jun. 30, 2019	Apr. 30, 2019	Mar. 31, 2021	Mar. 31, 2020
Stock-based compensation
Total stock-based compensation expense				$ 2,364	$ 1,237
Total unrecognized compensation cost related to unvested stock-based awards				$ 23,608
Weighted average period of recognition for unrecognized compensation cost				2 years 3 months 18 days
Common Stock
Stock-based compensation
Issuance of restricted common stock upon early exercise of stock options (in shares)	491,207	491,207	491,207
Exercise price of common stock purchase	$ 0.65	$ 0.65	$ 0.65
Proceeds from the early exercise of stock options in exchange for restricted common stock	$ 321	$ 321	$ 321
Research and development expense
Stock-based compensation
Total stock-based compensation expense				$ 1,645	368
General and administrative expense
Stock-based compensation
Total stock-based compensation expense				$ 719	$ 869

X

- Definition

The average exercise price of purchase of early exercised option in exchange for restricted stock.

+ References

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The cash inflow associated with the amount of early exercised of stock option in exchange for restricted stock.

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- Definition

Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

+ References

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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- Definition

Amount of cost to be recognized for option under share-based payment arrangement.

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- Definition

Number, before forfeiture, of shares issued under share-based payment arrangement. Excludes employee stock ownership plan (ESOP).

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