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Commitments and Contingencies Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2023
Lease Costs      
Operating Lease, Expense $ 222 $ 160  
Finance Lease, Right-of-Use Asset, Amortization 7 129  
Lease, Cost 229 $ 289  
Operating Leases, Income Statement, Sublease Revenue $ 33   $ 297