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Segment, Customer Concentration and Geographical Information (Details Textual) | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Segment and Geographical Information (Additional Textual) [Abstract] |  |  |
Number of primary business units | 2 | 2 |
Sprint [Member] |  |  |
Segment and Geographical Information (Textual) [Abstract] |  |  |
Percentage contribution to total revenue | 40.70% | 24.80% | 13.90%
Verizon Wireless [Member] |  |  |
Segment and Geographical Information (Textual) [Abstract] |  |  |
Percentage contribution to total revenue | 20.50% | 18.40% | 40.10%
AT&T [Member] |  |  |
Segment and Geographical Information (Textual) [Abstract] |  |  |
Percentage contribution to total revenue |  | 11.70% | 12.30%

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- Details
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- Definition Percentage of revenue generated from a single external customer that accounts for 10 percent or more of an entity's revenues. + References No definition available. + Details
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- Definition Number of operating segments. An operating segment is a component of an enterprise: (a) that engages in business activities from which it may earn revenues and incur expenses (including revenues and expenses relating to transactions with other components of the same enterprise), (b) whose operating results are regularly reviewed by the enterprise's chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance, and (c) for which discrete financial information is available. An operating segment may engage in business activities for which it has yet to earn revenues, for example, start-up operations may be operating segments before earning revenues. + References No definition available. + Details
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