Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,888	$ 16,280
Accumulated depreciation	(12,455)	(12,062)
Property and equipment, net	3,433	4,218
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,397	2,670
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,157	2,242
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,898	8,858
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 2,436	$ 2,510