Property and Equipment - Summary of Property and Equipment (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 10,755	$ 9,795
Accumulated depreciation and amortization	(6,141)	(5,387)
Property and equipment, net	4,614	4,408
Machinery and Manufacturing Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	6,357	5,846
Computer Equipment [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	2,052	1,875
Furniture [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	448	374
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property and equipment, Gross	$ 1,898	$ 1,700