Amortizable Intangible Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Goodwill And Intangible Assets Disclosure [Abstract]
Alliance and product supply agreement	$ 68,200	$ 68,200
Less accumulated amortization	(68,200)	(64,203)
Net Alliance and product supply agreement		3,997
Lease agreements (net of accumulated amortization of $6,936 and $4,785)	8,969	10,407
Finite Lived Intangible Liabilities Net, Total	$ 8,969	$ 14,404