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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Other Current Assets [Abstract] |  |
Prepaid services | $ 87 | $ 410
Deferred costs (Note 7) | 436 | 234
Prepaid insurance | 559 | 636
Total other current assets | $ 1,082 | $ 1,280

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