Right of use of assets - Summary of costs included in operating expenses related to right of use assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Lease cost
Operating lease cost	$ 2,331	$ 2,263	$ 1,844
Short-term lease cost	279	256	86
Total lease cost	2,610	2,519	1,930
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows used in operating leases	2,264	2,219	1,971
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 4,184	$ 783	$ 4,513
Weighted average remaining lease term (in years)	1 year 11 months 15 days	1 year 6 months 29 days	1 year 7 months 20 days
Weighted average discount rate	8.49%	5.70%	4.99%