Leases - Lease Cost (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease cost	$ 882	$ 1,157
Short-term lease cost	6	6
Variable lease cost	281	290
Sublease income	(84)	(84)
Total lease cost	1,085	1,369
Cash paid for amounts included in the measurement of lease liabilities	1,099	1,310
Right-of-use assets obtained in exchange for lease obligations—operating leases	$ 1,020	$ 3,207