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
Leases [Abstract]
Operating lease cost	$ 1,394	$ 1,386	$ 4,141	$ 4,193
Finance lease cost
Amortization of right-of-use (“ROU”) asset	52	50	156	119
Interest expense	12	14	37	35
Short-term lease cost	105	177	322	453
Variable lease cost	363	390	1,160	1,156
Total lease cost	$ 1,926	$ 2,017	$ 5,816	$ 5,956