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Share-Based Payments - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Mar. 14, 2016
Jan. 01, 2016
Jan. 01, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Feb. 06, 2014
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       $ 3,100,000   $ 3,100,000    
Total unrecognized compensation cost related to non-vested stock options and unvested restricted stock, recognition period (in years)           1 year 10 months 6 days    
Stock-based compensation expense       621,000 $ 602,000 $ 1,207,000 $ 1,266,000  
Performance Shares                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Stock-based compensation expense       14,000 $ 0 14,000 $ 0  
Unrecognized compensation expense related to performance based awards       $ 28,000   $ 28,000    
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 20,760              
Purchase price of shares authorized (in dollars per share) $ 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)       618,988   618,988