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Commitments and Contingencies Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease Costs        
Operating Lease, Expense $ 166 $ 168 $ 331 $ 295
Finance Lease, Right-of-Use Asset, Amortization 196 176 391 327
Finance Lease, Interest Expense 0 1 0 1
Lease, Cost $ 362 $ 345 $ 722 $ 623