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Fair Value Measurements and Financial Instruments - Financial Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  | $ 27,220 | $ 8,261
Liabilities, fair value |  | 3,224 | 10,629
Money Market Funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [1] | 26,654 | 3,300
CVR Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, fair value |  |  | 4,961
Warrant Liability, Noncurrent |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, fair value |  | 3,224 | 5,668
Short-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] | 566 |
Receivable from GCBP |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  |  | 4,961
Fair Value, Inputs, Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  | 27,220 | 3,300
Fair Value, Inputs, Level 1 | Money Market Funds |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [1] | 26,654 | 3,300
Fair Value, Inputs, Level 1 | Short-Term Investments |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value | [2] | 566 |
Fair Value, Inputs, Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  |  | 4,961
Liabilities, fair value |  | 3,224 | 10,629
Fair Value, Inputs, Level 3 | CVR Derivative Liability |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, fair value |  |  | 4,961
Fair Value, Inputs, Level 3 | Warrant Liability, Noncurrent |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Liabilities, fair value |  | $ 3,224 | 5,668
Fair Value, Inputs, Level 3 | Receivable from GCBP |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Assets, fair value |  |  | $ 4,961
[1] | Included in cash and cash equivalents on the accompanying condensed consolidated balance sheets.
[2] | Included i n prepaid assets and other current assets on the accompanying condensed consolidat ed balance sheets.

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