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Stock-based compensation - Additional Information (Details) $ in Millions				1 Months Ended		6 Months Ended
	Apr. 01, 2023 shares	May 31, 2021 shares	Jul. 09, 2018 shares	Sep. 30, 2023 shares	Dec. 31, 2022 shares	Sep. 30, 2023 USD ($) shares	Apr. 01, 2022 shares	Jul. 31, 2017
Stock-Based Compensation
Conversion ratio								1
Granted (in shares)		125,000		125,000	82,500	2,064,526
Value of stock options exercised | $						$ 1.3
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				2,064,858		2,064,858
Additional shares authorized (in shares)	2,646,422
Share based payment award percentage of outstanding shares			4.00%
2018 Plan | Pre-funded warrants
Stock-Based Compensation
Common stock reserved for issuance (in shares)			9,484,238
ESPP
Stock-Based Compensation
Additional shares authorized (in shares)	661,605		697,224
Share based payment award percentage of outstanding shares			1.00%
Common stock reserved for issuance (in shares)	2,738,208		348,612				2,738,208
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
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)						1,216,516
Restricted stock units | Newly-Hired Executive
Stock-Based Compensation
Restricted stock unit grant (in shares)		88,333		83,330	55,000

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