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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Other Current Assets [Abstract]      
Prepaid services   $ 644 $ 2,999
Prepaid insurance   636 698
Total other current assets $ 989 $ 1,280 $ 3,697