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Share-Based Payments - Additional Information (Detail) - USD ($)
9 Months Ended
Sep. 20, 2016
Sep. 14, 2016
Mar. 14, 2016
Jan. 01, 2016
Jan. 01, 2015
Sep. 30, 2016
Feb. 06, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Exercised (in USD per share)           $ 0.49  
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock           $ 2,400,000  
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period (in years)           2 years 9 months 22 days  
Stock-based compensation expense $ 1,700,000            
Performance Shares              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock           $ 0  
2014 Employee Stock Purchase Plan              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Shares authorized upon initial issuance (in shares)             157,480
Employee stock purchase plan issued during period (in shares)   68,111 20,760        
Purchase price of shares authorized (in USD per share)   $ 0.42 $ 0.31        
Stock Incentive Plan 2014              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Increase in number of shares reserved for future issuance (in shares)       786,431 722,331    
Shares available for issuance (in shares)           713,021  
Shares authorized in period 650,000            
Exercised (in USD per share) $ 3.37            
Expiration period (in years) 10 years            
Award vesting period (in years) 4 years            
Award vesting rights (in percentage) 25.00%            
Period of date of grant (in years) 1 year            
Additional award vesting rights (in percentage) 6.25%            
Period of option vesting (in years) 3 months            
Incentive Plan 2009              
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]              
Stock-based compensation expense $ 100,000