Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Leases [Abstract]
Operating lease cost	$ 182	$ 182	$ 364	$ 360
Short-term lease cost	4	30	8	57
Finance lease cost
Amortization of right-of-use assets	305	305	610	610
Interest on lease liabilities	192	208	387	419
Total finance lease cost	497	513	997	1,029
Total lease costs	$ 683	$ 725	$ 1,369	$ 1,446