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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 27, 2015
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted   6,657,000 1,658,000  
Granted   $ 3.02 $ 2.92  
Share-based compensation expense   $ 6,350 $ 3,588 $ 3,443
Shares issued under the ESPP   506,100 114,791  
Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Duration of the options granted   10 years    
Weighted-average fair value of option awards granted per share   $ 1.63 $ 1.48 $ 1.20
Intrinsic value of stock options exercised during period   $ 900 $ 100 $ 44
Unrecognized share-based compensation cost   $ 6,600    
Expected recognition period   3 years 3 months 29 days    
Share-based compensation expense   $ 3,200 800 800
Employee Stock Options | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Employee Stock Options | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Restricted Stock Units        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expected recognition period   1 year 8 months 22 days    
Share-based compensation expense   $ 2,800 $ 2,900 $ 2,600
Number of RSUs awarded to employees   1,042,659 2,658,956 447,703
Aggregate fair value of awards   $ 4,700 $ 5,700 $ 900
Unrecognized compensation expense related to non-vested RSUs   $ 2,100    
Restricted Stock Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Range of RSUs price per unit at fair value   $ 1.70 $ 1.60 $ 1.74
Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Range of RSUs price per unit at fair value   $ 6.24 $ 3.55 $ 4.17
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under the plan   4,074,000    
Share-based compensation expense   $ 400 $ 100  
Percentage of lower limit value of common stock   85.00%    
Purchase period duration   6 months    
Maximum limit of payroll deductions (percent)   10.00%    
Feeney Wireless        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted 323,000      
Granted $ 4.65      
Feeney Wireless | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Duration of the options granted   10 years    
Vesting period   4 years    
2015 Incentive Compensation Plan | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under the plan   4,000,000    
2009 Omnibus Incentive Compensation Plan | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under the plan   12,323,000    
Executive employee | DigiCore | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Duration of the options granted   10 years    
Vesting period   4 years    
Non-executive employee | DigiCore | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Duration of the options granted   10 years