Segment, Customer Concentration and Geographical Information - Revenues Generated by Each Business Unit (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Revenue from External Customer [Line Items]
Total revenues	$ 11,843	$ 8,746	$ 10,484	$ 11,602	$ 12,032	$ 11,012	$ 10,171	$ 10,114	$ 42,675	$ 43,329	$ 57,767
Cost of revenues									9,707	8,448	13,761
Gross profit	9,473	6,254	8,083	9,158	9,695	8,892	8,375	7,919	32,968	34,881	44,006
Wireless [Member]
Revenue from External Customer [Line Items]
Total revenues									35,853	37,154	48,951
Productivity & Graphics [Member]
Revenue from External Customer [Line Items]
Total revenues									$ 6,822	$ 6,175	$ 8,816