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Segment Information and Concentrations of Risk (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
Net revenues : |  |  |  |  |  |  |  |  |  |  |
Net revenues | $ 70,675 | $ 71,017 | $ 102,446 | $ 100,150 | $ 109,794 | $ 113,263 | $ 118,021 | $ 61,784 | $ 344,288 | $ 402,862 | $ 338,942
Operating income (loss) : |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (88,743) | (33,727) | (25,002)
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | 161,531 |  |  |  | 249,179 |  |  |  | 161,531 | 249,179 |
Mobile Computing Products [Member] |  |  |  |  |  |  |  |  |  |  |
Net revenues : |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 312,508 | 358,106 | 332,464
Operating income (loss) : |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (22,924) | (13,764) | (23,027)
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | 141,045 |  |  |  | 181,180 |  |  |  | 141,045 | 181,180 |
M2M Products and Solutions [Member] |  |  |  |  |  |  |  |  |  |  |
Net revenues : |  |  |  |  |  |  |  |  |  |  |
Net revenues |  |  |  |  |  |  |  |  | 31,780 | 44,756 | 6,478
Operating income (loss) : |  |  |  |  |  |  |  |  |  |  |
Operating loss |  |  |  |  |  |  |  |  | (65,819) | (19,963) | (1,975)
Identifiable assets: |  |  |  |  |  |  |  |  |  |  |
Identifiable assets | $ 20,486 |  |  |  | $ 67,999 |  |  |  | $ 20,486 | $ 67,999 |

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