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Stockholders' equity (Details) - $ / shares	Mar. 31, 2021	Mar. 31, 2020
Stockholders' Equity
Shares authorized (in shares)	150,000,000	150,000,000
Par value (in dollars per share)	$ 0.001	$ 0.001
Common stock
Stockholders' Equity
Common stock reserved for issuance	14,572,115	10,449,033
Undesignated preferred stock | Initial public offering
Stockholders' Equity
Undesignated preferred stock, authorized	10,000,000
Preferred stock, Par Value (in dollars per share)	$ 0.001
Undesignated preferred shares issued	0
Undesignated preferred shares outstanding	0

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