Leases - Components of operating lease expense (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2022
Components of operating lease expense
Finance lease amortization of right-of-use asset	$ 92	$ 92
Finance lease interest on lease liability	46	46
Operating lease expense	603	1,329
Variable lease expense	345	558
Short-term lease expense	5	10
Total lease expense	$ 1,091	$ 2,035