Common stock (Details) $ / shares in Units, $ in Millions	1 Months Ended	9 Months Ended
	Feb. 28, 2022 USD ($) $ / shares shares	Jun. 30, 2023 vote $ / shares	Sep. 30, 2022 $ / shares
Class of Stock [Line Items]
Common stock, par value (in usd per share) | $ / shares		$ 0.00001	$ 0.00001
Common stock, number of votes per share | vote		1
Subsequent Public Offering
Class of Stock [Line Items]
Sale of stock, shares issued (in shares) | shares	5,227,272
Sale of stock, share price (in usd per share) | $ / shares	$ 55.00
Over-Allotment Option
Class of Stock [Line Items]
Sale of stock, shares issued (in shares) | shares	681,818
Sale of stock, consideration received | $	$ 269.8