Leases - Components of Lease Expense and Supplemental Cash Flow Information (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 expense	$ 258	$ 652	$ 1,112	$ 1,958
Amortization of right-of-use assets	4	357	13	577
Interest on lease liabilities	5	3	14	6
Total finance lease expense	9	360	27	583
Short-term lease expense	57	22	145	97
Total lease expense	324	1,034	1,284	2,638
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	317	584	2,312	1,749
Operating cash flows from finance leases	5	3	13	6
Financing cash flows from finance leases	$ 51	$ 6	$ 152	$ 51