Equipment and Leasehold Improvements - Components of Equipment and Leasehold Improvements (Detail) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 20,250	$ 19,801
Less: Accumulated depreciation and amortization	(18,389)	(17,663)
Property, Plant and Equipment, Net, Total	1,861	2,138
Machinery and Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	14,562	14,095
Office Equipment [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	778	766
Office Furniture [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	110	110
Leasehold Improvements [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	4,789	4,760
Construction in Progress [Member]
Property, Plant and Equipment [Line Items]
Property, Plant and Equipment, Gross	$ 11	$ 70