License and Acquired Intangibles, Net - Schedule of Finite Lived Intangible Assets (Detail) - USD ($) $ in Thousands	Mar. 31, 2025	Dec. 31, 2024
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	$ 227,712	$ 227,712
Accumulated Amortization	80,385	71,040
Net Carrying Value	147,327	156,672
License and Acquired Intangibles for RUZURGI [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	33,569	33,569
Accumulated Amortization	6,319	5,739
Net Carrying Value	27,250	27,830
License and Acquired Intangibles for FYCOMPA [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	158,143	158,143
Accumulated Amortization	69,209	61,301
Net Carrying Value	88,934	96,842
Licensed And Acquired Intangibles For AGAMREE [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Value	36,000	36,000
Accumulated Amortization	4,857	4,000
Net Carrying Value	$ 31,143	$ 32,000