Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenue from External Customer [Line Items]
Total revenues	$ 8,746	$ 11,012	$ 30,832	$ 31,297
Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues	7,243	9,601	25,989	27,016
Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues	$ 1,503	$ 1,411	$ 4,843	$ 4,281