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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

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