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Share-based Compensation - Additional Information (Detail) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Mar. 27, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares)   3,877,000 1,051,550  
Weighted-average exercise price of stock options granted   $ 1.15 $ 1.65  
Share-based compensation expense   $ 3,748 $ 4,588 $ 6,350
Shares issued under the ESPP   232,038 789,565 506,100
Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of stock options granted   10 years    
Weighted-average fair value of stock option awards granted (per share)   $ 0.89 $ 1.05 $ 1.63
Intrinsic value of stock options exercised during period   $ 100 $ 100 $ 900
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Stock Options   $ 2,600    
Expected recognition period   1 year 6 months 5 days    
Share-based compensation expense   $ 2,300 2,200 3,200
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   2 years 4 months 29 days    
Share-based compensation expense   $ 1,300 $ 2,000 $ 2,800
Number of RSUs awarded to employees   1,480,301    
Weighted-average grant-date fair value of RSUs granted (per share)   $ 1.83 $ 1.62 $ 4.55
Total vest date fair value of RSUs vested   $ 3,000 $ 900 $ 3,100
Unrecognized share-based compensation expense related to non-vested RSUs   $ 1,100    
Restricted Stock Units | Minimum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   3 years    
Restricted Stock Units | Maximum        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period   4 years    
Employee Stock Purchase Plan        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of shares authorized under the plan   5,074,000    
Share-based compensation expense   $ 100 $ 400 $ 400
Percentage of lower limit value of common stock   85.00%    
Purchase period duration   6 months    
Maximum limit of payroll deductions (percent)   10.00%    
FW        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Granted (shares) 323,000      
Weighted-average exercise price of stock options granted $ 4.65      
FW | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of stock 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   15,323,000    
Executive employee | DigiCore/Ctrack | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of stock options granted   10 years    
Vesting period   4 years    
Non-executive employee | DigiCore/Ctrack | Employee Stock Options        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Expiration period of stock options granted   10 years