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Stock-based compensation - Additional Information (Details) $ in Millions					3 Months Ended	6 Months Ended
	Apr. 01, 2022 shares	May 31, 2021 shares	Apr. 01, 2021 shares	Jul. 09, 2018 shares	Sep. 30, 2022 USD ($) shares	Sep. 30, 2022 shares	Mar. 31, 2022 shares	Oct. 31, 2020 shares	Jun. 30, 2020 shares	Nov. 30, 2019 shares	Jul. 31, 2017
Stock-Based Compensation
Conversion ratio											1
Number of stock warrants issued (in shares)				5,284,238				2,200,000	3,084,238	5,284,238
Granted (in shares)		125,000,000				1,325,894
Value of stock options exercised | $					$ 1.2
2017 Plan
Stock-Based Compensation
Shares authorized (in shares)					2,659,885	2,659,885
Number of shares available for grant				2,520,247	0	0
2018 Plan
Stock-Based Compensation
Shares authorized (in shares)				3,617,968
Number of shares available for grant					2,327,646	2,327,646
Additional shares authorized (in shares)	2,104,915		2,074,028
Share based payment award percentage of outstanding shares				4.00%
ESPP
Stock-Based Compensation
Additional shares authorized (in shares)	526,228		518,507	697,224
Share based payment award percentage of outstanding shares				1.00%
Common stock reserved for issuance (in shares)	2,076,603		2,076,603	348,612
Stock options
Stock-Based Compensation
Exercise price for persons holding ten percent of voting power (as a percent)					100.00%	100.00%
Exercise price for persons holding more than ten percent of voting power (as a percent)					110.00%	110.00%
Share based payment award expiration period						10 years
Share based payment award vesting period						4 years
Common stock reserved for issuance (in shares)					18,862,638	18,862,638	16,605,804
Stock options | Maximum
Stock-Based Compensation
Expiration period for persons holding ten percent of voting power						5 years
Stock options | Minimum
Stock-Based Compensation
Expiration period for persons holding more than ten percent of voting power						10 years
Restricted stock units
Stock-Based Compensation
Share based payment award vesting period						4 years
Restricted stock unit grant (in shares)						657,142
Restricted stock units | Newly-Hired Executive
Stock-Based Compensation
Restricted stock unit grant (in shares)		88,333,000
Restricted stock units | Share-based Payment Arrangement, Tranche One
Stock-Based Compensation
Share based payment award vesting period						1 year

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Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

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