Leases - Lease Costs (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	$ 1,389	$ 1,421	$ 2,678	$ 2,533
Short-term lease cost	30	260	166	484
Variable lease cost	160	99	298	199
Total lease cost	$ 1,579	$ 1,780	$ 3,142	$ 3,216