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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2025
Dec. 31, 2024
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid services $ 551 $ 87
Deferred costs (Note 8) 299 436
Prepaid insurance 135 559
Total other current assets $ 985 $ 1,082