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License and Acquired Intangibles, Net - Schedule of Finite Lived Intangible Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2025
Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value $ 227,712 $ 227,712
Accumulated Amortization 89,729 71,040
Net Carrying Value 137,983 156,672
License and Acquired Intangibles for RUZURGI [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 33,569 33,569
Accumulated Amortization 6,899 5,739
Net Carrying Value 26,670 27,830
License and Acquired Intangibles for FYCOMPA [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 158,143 158,143
Accumulated Amortization 77,116 61,301
Net Carrying Value 81,027 96,842
Licensed And Acquired Intangibles For AGAMREE [Member]    
Finite-Lived Intangible Assets [Line Items]    
Gross Carrying Value 36,000 36,000
Accumulated Amortization 5,714 4,000
Net Carrying Value $ 30,286 $ 32,000