Operating Leases - Components of Lease Costs (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease costs	$ 843	$ 892	$ 2,511	$ 2,690
Short-term lease costs	464	480	1,411	1,332
Variable lease costs	199	205	663	654
Lease costs	$ 1,506	$ 1,577	$ 4,585	$ 4,676