Common stock - Warrants (Details) - USD ($) $ / shares in Units, $ in Thousands		24 Months Ended
	Sep. 02, 2022	Dec. 31, 2023	Sep. 01, 2022
Class of Warrant or Right [Line Items]
Impact of deemed dividend in stockholder' equity	$ 0
Series B Warrants
Class of Warrant or Right [Line Items]
Exercise price	$ 10.00		$ 45.00
Warrants
Class of Warrant or Right [Line Items]
Warrants exercised, numbers		0
Warrants | Series B Warrants
Class of Warrant or Right [Line Items]
Warrants outstanding		500,000
Exercise price		$ 10.00