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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 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Net revenues by reportable segment:          
Net revenues $ 37,270 $ 91,124 $ 85,554 $ 177,045  
Operating loss by reportable segment:          
Operating loss (17,398) (7,744) (26,325) (16,929)  
Identifiable assets by reportable segment:          
Identifiable assets 86,863   86,863   111,465
Mobile Computing Products [Member]
          
Net revenues by reportable segment:          
Net revenues 27,497 80,823 63,695 156,443  
Operating loss by reportable segment:          
Operating loss (12,246) (3,348) (18,372) (8,848)  
Identifiable assets by reportable segment:          
Identifiable assets 73,853   73,853   96,516
M2M Products and Solutions [Member]
          
Net revenues by reportable segment:          
Net revenues 9,773 10,301 21,859 20,602  
Operating loss by reportable segment:          
Operating loss (5,152) (4,396) (7,953) (8,081)  
Identifiable assets by reportable segment:          
Identifiable assets $ 13,010   $ 13,010   $ 14,949