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Agreements - Summary of Aggregate Amount Paid for the Assets Acquired (Parenthetical) (Detail) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
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Jan. 31, 2023 | Sep. 30, 2023
U.S. Rights for FYCOMPA [Member] |  |  |
Asset Acquisition [Line Items] |  |  |
Transaction expenses | $ 5,870 | [1] | $ 5,900
[1] | As of September 30, 2023, the full $5.9 million was paid in cash.

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