Property and Equipment, Net - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 11,816	$ 7,932
Less: Accumulated depreciation	(530)	(490)
Total property and equipment, net	11,286	7,442
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	9,796	2,534
Construction-in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	697	4,134
Computers, Office Equipment, and Minor Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	549	393
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	258	290
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	193	239
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 323	$ 342