Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Finance lease cost
Amortization of ROU assets	$ 62	$ 58	$ 123	$ 115
Interest on lease liabilities	38	40	75	81
Operating lease cost	1,302	1,191	2,581	2,299
Short-term lease cost	82	88	168	178
Variable lease cost	234	328	495	713
Sublease income	(10)	(1)	(21)	(3)
Total lease expense	$ 1,708	$ 1,704	$ 3,421	$ 3,383