Property and Equipment, Net (Detail) - USD ($) $ in Thousands	Sep. 30, 2016	Dec. 31, 2015
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 15,384	$ 16,280
Accumulated depreciation	(12,712)	(12,062)
Property and equipment, net	2,672	4,218
Building and Leasehold Improvements
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,252	2,670
Furniture, Fixtures and Office Equipment
Property Plant And Equipment [Line Items]
Property and equipment, gross	2,290	2,242
Plant and Machinery
Property Plant And Equipment [Line Items]
Property and equipment, gross	8,901	8,858
Purchased Software
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 1,941	$ 2,510