Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended				12 Months Ended
	Mar. 31, 2022	Feb. 28, 2022	Jan. 31, 2021	Aug. 31, 2019	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Intangible Assets
Amortization expense					$ 23,845	$ 22,966	$ 18,424
Net product revenue					$ 582,022	$ 437,855	$ 305,440
WAKIX
Intangible Assets
Final payment paid	$ 40,000
Useful life of intangible asset					7 years 7 months 6 days
Remaining useful life					5 years 9 months 18 days
WAKIX | United States
Intangible Assets
Net product revenue		$ 500,000
WAKIX | Daytime Sleepiness
Intangible Assets
License agreement milestone payments paid				$ 75,000
Useful life of intangible asset					10 years
Remaining useful life					5 years 9 months 18 days
NDA for WAKIX. | Cataplexy
Intangible Assets
License agreement milestone payments paid			$ 100,000
Useful life of intangible asset					9 years
Remaining useful life					5 years 9 months 18 days