Property and Equipment, Net - Additional Information (Detail) - USD ($)	6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015
Property, Plant and Equipment [Line Items]
Depreciation	$ 269,000	$ 82,000
Property and equipment disposals	2,630,000	$ 0
Gain (Loss) on sale of property and equipment	(2,278,000)
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment disposals	2,630,000
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