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Earnings Per Share - Narrative (Detail)
3 Months Ended 9 Months Ended
Mar. 27, 2015
employee
$ / shares
shares
Sep. 30, 2015
shares
Sep. 30, 2014
shares
Sep. 30, 2015
shares
Sep. 30, 2014
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Issued (shares)   3,702,470   5,774,170  
Weighted-average options, RSUs, and ESPP shares outstanding (shares)   7,757,889 4,761,066 6,262,129 5,313,009
Feeney Wireless          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of grant recipients (employees) | employee 91        
Issued (shares) 323,000        
Exercise price ($ per share) | $ / shares $ 4.65        
Employee Stock Option | Feeney Wireless          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Expected term 10 years        
Vesting on First Anniversary | Employee Stock Option | Feeney Wireless          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 25.00%        
Monthly Vesting After First Anniversary | Employee Stock Option | Feeney Wireless          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Vesting percentage 75.00%