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Composition of Certain Financial Statement Captions - Other Current Assets (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Prepaid Expense and Other Assets, Current [Abstract] |  |
Prepaid services | $ 614 | $ 87
Deferred costs (Note 7) | 446 | 436
Prepaid insurance | 254 | 559
Total other current assets | $ 1,314 | $ 1,082

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