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Agreements - Summary of Aggregate Amount Paid for the Assets Acquired (Detail) - USD ($) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jul. 31, 2023 | Jan. 31, 2023 | Sep. 30, 2023
Asset Acquisition [Line Items] |  |  |  |  |
Total purchase consideration |  | $ 94,978 |  |  |
U.S. Rights for FYCOMPA [Member] |  |  |  |  |
Asset Acquisition [Line Items] |  |  |  |  |
Base cash payment |  |  | $ 160,000 |  |
Cash paid for pro-rated prepaid expenses |  |  | 1,576 |  |
Reimbursement on base purchase price | [1] |  | (3,238) |  |
Transaction costs |  |  | 5,870 | [2] | $ 5,900
Total purchase consideration |  |  | $ 164,208 |  |
[1] | Recorded in prepaid expenses and other current assets in the accompanying consolidated balance sheet as of the acquisition date and reimbursement was fully applied as of June 30, 2023.
[2] | As of September 30, 2023, the full $5.9 million was paid in cash.

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