Leases - Components of Lease Expense and Supplemental Cash Flow Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Leases [Abstract]
Operating lease expense	$ 238	$ 570
Finance lease expense:
Amortization of right-of-use assets	4	5
Interest on lease liabilities	3	4
Total finance lease expense	7	9
Short-term lease expense	69	32
Total lease expense	314	611
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	372	584
Operating cash flows from finance leases	(3)	3
Financing cash flows from finance leases	$ (14)	$ (51)