Leases - Components of lease expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 5,935	$ 5,000	$ 4,300
Short-term lease cost	272
Variable lease cost	1,943
Total lease expense	$ 8,150