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Notes Payable - Interest expense (Details) - Notes Payable - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Notes Payable        
Interest expense $ 1 $ 1 $ 3 $ 3
Amortization of debt discount   10   30
Total interest expense $ 1 $ 11 $ 3 $ 33