Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,308	$ 15,149
Accumulated depreciation	(13,173)	(13,106)
Property and equipment, net	2,135	2,043
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,050	1,917
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,852	1,771
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	9,026	9,411
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,163	$ 2,050
Construction-in-Progress
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 217

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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Amount before accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

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