Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Finance lease cost
Amortization of ROU assets	$ 59	$ 16	$ 174	$ 48
Interest on lease liabilities	40	2	121	6
Operating lease cost	1,254	1,057	3,553	2,967
Short-term lease cost	88	102	266	330
Variable lease cost	264	236	977	657
Sublease income	(2)	(2)	(5)	(5)
Total lease expense	$ 1,703	$ 1,411	$ 5,086	$ 4,003