Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease Cost:
Operating lease cost	$ 3,724	$ 3,617
Short-term lease cost	247	204
Variable lease cost	842	948
Sublease income	(43)	(13)
Total lease cost	$ 4,770	$ 4,756