Leases - 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
Leases [Abstract]
Operating lease cost	$ 1,368	$ 1,406	$ 2,747	$ 2,807
Finance lease cost
Amortization of right-of-use (“ROU”) asset	52	45	104	69
Interest expense	12	14	25	21
Short-term lease cost	108	133	217	276
Variable lease cost	374	311	797	766
Total lease cost	$ 1,914	$ 1,909	$ 3,890	$ 3,939