Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 18,073	$ 16,413
Accumulated depreciation	(13,942)	(13,586)
Property and equipment, net	4,131	2,827
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,361	1,498
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,354	1,295
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	13,076	11,429
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,282	$ 2,191

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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