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License and Acquired Intangibles, Net - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]          
Amortization of intangible assets     $ 18,689,000 $ 18,688,000  
Impairment charges recognized on definite-lived intangibles $ 0 $ 0 $ 0 0  
Finite-Lived Intangible Assets, Remaining Amortization Period 4 years 10 months 24 days   4 years 10 months 24 days   5 years 4 months 24 days
License and Acquired Intangibles for RUZURGI [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life 14 years 6 months   14 years 6 months    
Amortization of intangible assets $ 600,000 600,000 $ 1,200,000 1,200,000  
License and Acquired Intangibles for FYCOMPA [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life 5 years   5 years    
Amortization of intangible assets $ 7,900,000 7,900,000 $ 15,800,000 15,800,000  
Licensed And Acquired Intangibles For AGAMREE [Member]          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life 10 years 6 months   10 years 6 months    
Amortization of intangible assets $ 800,000 $ 800,000 $ 1,700,000 $ 1,700,000