Property and Equipment, Net - Additional Information (Detail) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 186,000	$ 40,000
Property and equipment disposals	2,508,000	0
Gain (Loss) on sale of property and equipment	(2,278,000)	$ 0
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment disposals	2,508,000
Gain (Loss) on sale of property and equipment	(2,180,000)
Manufacturing Equipment [Member] | Evonik [Member]
Property, Plant and Equipment [Line Items]
Property and equipment disposals	$ 2,265,000