Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Leases [Abstract]
Operating lease cost	$ 623	$ 635
Amortization of right-of-use assets	14	14
Interest on lease liabilities	5	6
Total finance lease cost	$ 19	$ 20