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Stock-Based Compensation - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Mar. 31, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Value of common stock and restricted stock granted     $ 2,100,000    
Common stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock purchase plan (ESPP), shares purchased/granted       11,000  
Minimum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized cost recognition period     12 months    
Maximum [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Unamortized cost recognition period     48 months    
Employee Stock Purchase Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock purchase plan, grant date fair value     $ 0.43    
Employee Stock Purchase Plan [Member] | September 30,2015 offering period end [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Employee stock purchase plan, grant date fair value     $ 0.60    
Stock options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock options granted     65,000    
Restricted stock [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Restricted stock, granted     1,400,000    
Cash payments of income taxes related to grants included in share-based compensation $ 22,000 $ 37,000 $ 54,000   $ 118,000
2015 Omnibus Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Number of shares available for future grants 8,500,000   8,500,000