Operating Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease expense	$ 4,773	$ 5,295
Short term lease expense	59	59
Variable lease expense	1,295	1,795
Sublease income	(36)	(32)
Total lease expense	$ 6,091	$ 7,117