Organization, Basis of Presentation and Summary of Significant Policies - Additional Information (Detail)	3 Months Ended
	Mar. 31, 2016 USD ($) Customer $ / shares	Dec. 31, 2015 USD ($) $ / shares
Basis Of Presentation [Line Items]
Common Stock, par value | $ / shares	$ 0.001	$ 0.001
Inventory allowances recorded	$ 0
Deferred revenue related to sales	$ 1,600,000	$ 1,900,000
Sales return maximum duration	18 months
Offered period for sales return prior to expiration	6 months
Offered period for sales return subsequent to expiration	12 months
Discount for prompt payment	2.00%
Number of large wholesalers | Customer	3
Percentage of accruals accounted by three large wholesalers	90.00%
BUNAVAIL [Member]
Basis Of Presentation [Line Items]
Deferred cost of sales	$ 1,600,000	$ 1,700,000
Minimum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers	30 days
Accrual to payment cycle period	1 month
Maximum [Member]
Basis Of Presentation [Line Items]
Period of payments from customers	37 days
Accrual to payment cycle period	3 months