Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,012	$ 14,707
Accumulated depreciation	(12,810)	(12,083)
Property and equipment, net	2,202	2,624
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,156	1,250
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,256	1,806
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	10,441	9,484
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,159	$ 2,167

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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