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Segment Information and Concentrations of Risk - Schedule of Net Revenues, Operating Loss and Identifiable Assets of Segments (Detail) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Dec. 31, 2013
Net revenues by reportable segment:          
Net revenues $ 44,330 $ 92,673 $ 129,884 $ 269,718  
Operating loss by reportable segment:          
Operating loss (3,896) (4,864) (30,221) (21,793)  
Identifiable assets by reportable segment:          
Identifiable assets 93,045   93,045   111,465
Mobile Computing Products [Member]
          
Net revenues by reportable segment:          
Net revenues 34,788 84,067 98,483 240,510  
Operating loss by reportable segment:          
Operating loss (1,704) (953) (20,076) (9,801)  
Identifiable assets by reportable segment:          
Identifiable assets 80,551   80,551   96,516
M2M Products and Solutions [Member]
          
Net revenues by reportable segment:          
Net revenues 9,542 8,606 31,401 29,208  
Operating loss by reportable segment:          
Operating loss (2,192) (3,911) (10,145) (11,992)  
Identifiable assets by reportable segment:          
Identifiable assets $ 12,494   $ 12,494   $ 14,949