Leases - Components of Lease Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Leases [Abstract]
Operating lease cost	$ 182	$ 182	$ 546	$ 542
Short-term lease cost	4	26	13	83
Finance lease cost
Amortization of right-of-use assets	305	305	915	915
Interest on lease liabilities	187	205	574	622
Total finance lease cost	492	510	1,489	1,537
Total lease costs	$ 678	$ 718	$ 2,048	$ 2,162