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Agreements - Summary of Aggregate Amount Paid for the Assets Acquired (Detail) - U.S. Rights for FYCOMPA [Member] - USD ($)
$ in Thousands
 1 Months Ended 9 Months Ended
Jan. 31, 2023
Sep. 30, 2023
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 condensed 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.