Property and Equipment, Net - Components of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 13,670	$ 13,040
Less: Accumulated depreciation	(1,829)	(1,376)
Total property and equipment, net	11,841	11,664
Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	10,373	10,099
Construction-in Progress [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	1,495	1,254
Computers, Office Equipment, and Minor Computer Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	659	573
Furniture and Fixtures [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	426	402
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	283	278
Software [Member]
Property, Plant and Equipment [Line Items]
Property and equipment gross	$ 434	$ 434