Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 14,451	$ 16,280
Accumulated depreciation	(12,035)	(12,062)
Property and equipment, net	2,416	4,218
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	1,884	2,670
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,002	2,242
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,848	8,858
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,717	$ 2,510