Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 10,454	$ 9,795
Accumulated depreciation and amortization	(5,711)	(5,387)
Property and equipment, net	4,743	4,408
Machinery and Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	6,367	5,846
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	1,986	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	$ 1,717	$ 1,700