Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenue from External Customer [Line Items]
Total revenues	$ 10,529	$ 8,449
Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues	9,219	6,855
Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 1,310	$ 1,594