Common stock - Warrants (Details) - Warrants	Mar. 31, 2023 $ / shares shares
Class of Warrant or Right [Line Items]
Warrants outstanding | shares	1,303,112
Series A Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding | shares	803,112
Exercise price	$ 9.00
Strike price	$ 9.00
Series B Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding | shares	500,000
Exercise price	$ 10.00
Strike price	$ 10.00