Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 9,586	$ 9,448	$ 29,501	$ 26,425
Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues	8,302	8,355	25,408	22,205
Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 1,284	$ 1,093	$ 4,093	$ 4,220