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Commitments and Contingencies Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Lease Costs        
Operating Lease, Expense $ 161 $ 174 $ 492 $ 469
Finance Lease, Right-of-Use Asset, Amortization 207 184 598 511
Finance Lease, Interest Expense 0 0 1 1
Lease, Cost $ 368 $ 358 $ 1,091 $ 981