Property, Plant & Equipment, Net - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016
Property, Plant & Equipment [Line Items]
Property, plant and equipment, net	$ 91,863		$ 91,863		$ 94,187
Property, Plant and Equipment [Member]
Property, Plant & Equipment [Line Items]
Depreciation and amortization	4,000	$ 2,800	9,100	$ 5,300
Property, Plant and Equipment Dedicated to R&D Activities [Member]
Property, Plant & Equipment [Line Items]
Property, plant and equipment, net	$ 2,000		$ 2,000