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Leases - Components of Lease Cost (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Leases    
Amortization of right-of-use assets $ 1,357 $ 1,424
Interest on lease liabilities 46 177
Total finance lease cost 1,403 1,601
Operating lease cost 1,511 1,586
Total lease cost $ 2,914 $ 3,187