Leases - Operating 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 cost	$ 2,224	$ 1,460	$ 5,802	$ 4,310
Variable lease cost	385	282	1,016	631
Total operating lease costs	$ 2,609	$ 1,742	$ 6,818	$ 4,941