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Stock-Based Compensation - Restricted Stock - Service-Based - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Service Based Restricted Stock [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Grants vesting period     4 years  
Restricted shares vested grant date intrinsic value $ 57 $ 25 $ 1,400 $ 3,200
Unrecognized compensation expense $ 3,600   $ 3,600  
Weighted average period     1 year 6 months  
Service Based Restricted Stock [Member] | Martin H. Singer, Chief Executive Officer [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options awarded     200,000  
Service Based Restricted Stock [Member] | Executive Officers and Other Executives [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options awarded     117,300  
Vesting period from grant date     1 year  
Nexgen Wireless, Inc. [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Stock options awarded     100,000