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Shareholders' Equity - Additional Information (Detail) - USD ($)
6 Months Ended
Jun. 30, 2015
Jun. 26, 2015
Jun. 16, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Compensation cost related to stock options granted but not yet recognized, net of estimated forfeitures $ 517,752    
Amortization cost, weighted-average period 1 year    
Stock Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase number of shares available for future grant     750,000
Inducement Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Increase number of shares available for future grant   200,000  
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Term of stock options granted 10 years    
Vesting of options granted 4 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Amortization cost, weighted-average period 1 year    
Compensation cost related to restricted stock units granted but not yet recognized $ 318,008