Intangible Assets - Schedule of Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 137,894	$ 137,894
Accumulated Amortization	18,543	16,525
Net Carrying Amount	119,351	121,369
HETLIOZ®
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	33,000	33,000
Accumulated Amortization	16,303	15,937
Net Carrying Amount	16,697	17,063
PONVORY® net product sales
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	104,894	104,894
Accumulated Amortization	2,240	588
Net Carrying Amount	$ 102,654	$ 104,306