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Commitments and Contingencies - Maturities of operating lease liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Commitments and Contingencies.    
2023 $ 74  
Total undiscounted lease payments 74  
Less: imputed interest 1  
Total operating lease liability 73  
Operating lease liabilities, current portion $ 73 $ 260