Co-Promotion Arrangement With Eagle Pharmaceuticals (Detail) $ in Thousands		3 Months Ended		9 Months Ended
	Nov. 04, 2015 USD ($) product	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees and service revenue		$ 5,161	$ 3,121	$ 11,562	$ 14,807
Collaborative Arrangement, Co-promotion [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
Number of products | product	6
Fixed payment	$ 12,800
Term of contract	18 months
Reimbursable expense		0	2,200	4,200	5,700
Co-Promotion With Eagle [Member]
Collaborative Arrangements and Non-collaborative Arrangement Transactions [Line Items]
License fees and service revenue		$ 0	$ 2,406	$ 4,747	$ 6,737