Accrued Liabilities (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Payables and Accruals [Abstract]
Accrued employee compensation and related costs	$ 7,869	$ 10,315
Accrued professional fees	8,235	3,206
Accrued sales allowances	12,763	10,837
Accrued royalties	3,150	4,137
Accrued research and development costs	2,821	1,561
Accrued interest	2,500	2,502
Other accrued liabilities	11,643	6,545
Total	$ 48,981	$ 39,103