Intangible Assets - Additional Information (Details) - USD ($) $ in Thousands	1 Months Ended		3 Months Ended			12 Months Ended	218 Months Ended
	Apr. 30, 2018	Jan. 31, 2014	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2015	Dec. 31, 2018	Mar. 31, 2022	Dec. 31, 2021
Finite-Lived Intangible Assets [Line Items]
Intangible asset amortization			$ 379	$ 370
HETLIOZ®
Finite-Lived Intangible Assets [Line Items]
Acquisition of intangible assets		$ 8,000				$ 25,000
Cumulative worldwide sales milestone	$ 250,000
Intangible assets capitalized					$ 25,000		$ 33,000
Gross Carrying Amount			33,000				33,000	$ 33,000
Accumulated Amortization			13,298				13,298	12,919
Fanapt®
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount			27,900				27,900	27,900
Accumulated Amortization			$ 27,900				$ 27,900	$ 27,900