Segment, Customer Concentration and Geographical Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Revenues generated by each business unit
Revenues	$ 12,032	$ 11,012	$ 10,171	$ 10,114	$ 11,239	$ 12,632	$ 16,105	$ 17,791	$ 43,329	$ 57,767	$ 130,501
Cost of revenues									8,448	13,761	15,507
Gross profit	9,695	8,892	8,375	7,919	8,513	8,933	12,545	14,015	34,881	44,006	114,994
Wireless [Member]
Revenues generated by each business unit
Revenues									36,963	48,711	118,684
Productivity & Graphics [Member]
Revenues generated by each business unit
Revenues									6,175	8,816	11,399
Corporate/Other [Member]
Revenues generated by each business unit
Revenues									$ 191	$ 240	$ 418