Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 11,880	$ 9,795
Accumulated depreciation and amortization	(5,959)	(5,387)
Property and equipment, net	5,921	4,408
Machinery and Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	7,868	5,846
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	1,915	1,875
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	384	374
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,713	$ 1,700