Leases - Components of operating lease expense (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Components of operating lease expense
Finance lease amortization of right-of-use asset	$ 69	$ 161
Finance lease interest on lease liability	69	115
Operating lease expense	603	1,932
Variable lease expense	297	855
Short-term lease expense	5	15
Total lease expense	$ 1,043	$ 3,078