Leases - Components of Lease Expense (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	$ 158	$ 158	$ 316	$ 317
Amortization of right-of-use assets	4	3	7	6
Interest on lease liabilities	1	2	3	4
Total finance lease cost	$ 5	$ 5	$ 10	$ 10