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Stock Based Compensation - Additional Information (Detail) - shares
12 Months Ended
Dec. 31, 2015
Jun. 19, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expiring period of equity options to employees (in years) 10 years  
Vesting period (in years) 4 years  
Year One    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (as a percent) 10.00%  
Year Two    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (as a percent) 20.00%  
Year Three    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (as a percent) 30.00%  
Year Four    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Award vesting rights (as a percent) 40.00%  
2015 Stock Options Plan    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Increase in number of shares available for grant (in shares)   1,700,000
Number of shares available for grant (in shares) 2,430,147