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Agreements - Summary of Total Purchase Price Allocated to Acquired Assets (Detail) - USD ($) $ in Thousands | 1 Months Ended
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Jul. 31, 2023 | Jan. 31, 2023
Asset Acquisition [Line Items] |  |
Total purchase consideration | $ 94,978 |
U.S. Rights for FYCOMPA [Member] |  |
Asset Acquisition [Line Items] |  |
Inventory |  | $ 4,100
Prepaid expenses and other current assets (samples) |  | 130
Prepaid commercialization expenses |  | 1,576
Property and equipment, net |  | 433
License and acquired intangibles for FYCOMPA® |  | 158,143
Accrued preclinical and clinical trial expenses |  | (174)
Total purchase consideration |  | $ 164,208

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