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License and Acquired Intangibles, Net - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 37,377,000 $ 32,565,000 $ 1,098,000
Impairment charges recognized on definite-lived intangibles $ 0 $ 0 0
Finite-Lived Intangible Assets, Remaining Amortization Period 5 years 4 months 24 days 6 years 6 months  
License and Acquired Intangibles for RUZURGI [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 14 years 6 months    
Amortization of intangible assets $ 2,300,000 $ 2,300,000 1,100,000
License and Acquired Intangibles for FYCOMPA [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 5 years    
Amortization of intangible assets $ 31,600,000 29,700,000 0
Licensed And Acquired Intangibles For AGAMREE [Member]      
Finite-Lived Intangible Assets [Line Items]      
Finite-lived intangible asset, useful life 10 years 6 months    
Amortization of intangible assets $ 3,400,000 $ 600,000 $ 0