License and Acquired Intangibles, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Amortization of intangible assets			$ 18,688	$ 15,019
Impairment charges recognized on definite-lived intangibles	$ 0	$ 0	$ 0	0
Finite-Lived Intangible Assets, Remaining Amortization Period	6 years		6 years		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		14 years 6 months
Amortization of intangible assets	$ 600	600	$ 1,200	1,200
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	7,900	$ 15,800	13,900
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	$ 0	$ 1,700	$ 0