Long-term debt - Debt (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Long-term debt
Term loan payable	$ 30,000	$ 30,000
End of term charge	1,018	946
Unamortized debt issuance costs	(216)	(248)
Carrying value of term loan	$ 30,802	$ 30,698