Summary of Intangible Assets (Detail) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 60,941	$ 60,941
Accumulated Amortization	34,008	33,122
Net Carrying Amount	$ 26,933	$ 27,819
HETLIOZ
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	2033-01	2033-01
Gross Carrying Amount	$ 33,000	$ 33,000
Accumulated Amortization	6,067	5,181
Net Carrying Amount	$ 26,933	$ 27,819
Fanapt
Finite-Lived Intangible Assets [Line Items]
Intangible assets, estimated useful life	2016-11	2016-11
Gross Carrying Amount	$ 27,941	$ 27,941
Accumulated Amortization	$ 27,941	$ 27,941