Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 9,386	$ 8,528	$ 19,915	$ 16,977
Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues	7,887	6,995	17,106	13,850
Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 1,499	$ 1,533	$ 2,809	$ 3,127