Leases - Lease Cost (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Lease cost
Finance lease cost: Amortization of right-of-use assets	$ 57	$ 40
Finance lease cost: Interest on lease liability	11	9
Operating lease cost	289	238
Short-term lease cost	1,016	721
Total lease cost	$ 1,373	$ 1,008