Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenue from External Customer [Line Items]
Total revenues	$ 10,484	$ 10,171	$ 22,086	$ 20,285
Operating Segments [Member] | Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues	8,525	8,776	18,746	17,415
Operating Segments [Member] | Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 1,959	$ 1,395	$ 3,340	$ 2,870