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Basis of Presentation and Significant Accounting Policies - Additional Information (Detail) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2024 | Sep. 30, 2023 | Dec. 31, 2023
Other Commitments [Line Items] |  |  |  |  |
Impairment of intangible assets | $ 0 | $ 0 | $ 0 | $ 0 |
Intangible assets, net | 105,515 |  | 105,515 |  | $ 65,490
Amortization of intangible assets |  |  | 9,975 | 2,728 |
Neuren Pharmaceuticals Limited [Member] | License Agreements [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Remainder of 2024 | 2,300 |  | 2,300 |  |
Amortization of intangible assets | 2,300 | $ 1,400 | 10,000 | $ 2,700 |
Finite-Lived Intangible Assets, Amortization Expense, Subsequent year | 9,400 |  | 9,400 |  |
FDA Approval Of DAYBUE [Member] | Neuren Pharmaceuticals Limited [Member] | License Agreements [Member] |  |  |  |  |
Other Commitments [Line Items] |  |  |  |  |
Intangible assets, net | $ 119,600 |  | $ 119,600 |  |

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