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License and Acquired Intangibles, Net - Schedule of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 227,712 $ 227,712
Accumulated Amortization 71,040 33,663
Net Carrying Value 156,672 194,049
License and Acquired Intangibles for RUZURGI [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 33,569 33,569
Accumulated Amortization 5,739 3,418
Net Carrying Value 27,830 30,151
License and Acquired Intangibles for FYCOMPA [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 158,143 158,143
Accumulated Amortization 61,301 29,673
Net Carrying Value 96,842 128,470
Licensed And Acquired Intangibles For AGAMREE [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 36,000 36,000
Accumulated Amortization 4,000 572
Net Carrying Value $ 32,000 $ 35,428