Net Sales by Product (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenue from External Customer [Line Items]
Net product sales	$ 42,056	$ 36,029	$ 79,471	$ 69,291
HETLIOZ
Revenue from External Customer [Line Items]
Net product sales	22,507	17,460	42,689	33,661
Fanapt
Revenue from External Customer [Line Items]
Net product sales	$ 19,549	$ 18,569	$ 36,782	$ 35,630