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Financing and Operating Leases - Components of Operating and Finance Lease Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Operating lease cost:    
Operating lease costs $ 2,649 $ 2,625
Variable lease costs 667 719
Short-term operating lease costs 75  
Total expense from operating leases 3,391 3,344
Finance lease cost:    
Right-of-use amortization expense 1,342 886
Interest on lease liabilities 540 290
Total financing lease cost $ 1,882 $ 1,176