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Investments and Fair Value Instruments - Summary of Amortized Cost and Fair Value of Investment Securities Portfolio (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | $ 2,757
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Estimated Fair Value | $ 4,800 | 2,757
Cash Equivalents [Member] | Money Market Funds [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Amortized Cost |  | 2,757
Unrealized Gains |  | 0
Unrealized Losses |  | 0
Estimated Fair Value |  | $ 2,757

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