Property and Equipment, Net - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 9,529	$ 7,932
Less: Accumulated depreciation	(446)	(490)
Total property and equipment, net	9,083	7,442
Computer and Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	392	393
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross		2,534
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	194	239
Construction-in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	8,362	4,134
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 323	$ 342