Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Finance lease cost
Amortization of ROU assets	$ 61	$ 57
Interest on lease liabilities	37	41
Operating lease cost	1,279	1,108
Short-term lease cost	86	90
Variable lease cost	261	385
Sublease income	(11)	(2)
Total lease expense	$ 1,713	$ 1,679