Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Lease Expense
Amortization of ROU assets	$ 58	$ 16	$ 115	$ 32
Interest on lease liabilities	40	2	81	4
Operating lease cost	1,191	997	2,299	1,910
Short-term lease cost	88	119	178	228
Variable lease cost	328	222	713	421
Sublease income	(1)	(1)	(3)	(3)
Total lease expense	$ 1,704	$ 1,355	$ 3,383	$ 2,592