Quarterly report pursuant to Section 13 or 15(d)

Stock Option and Incentive Plans - Additional Information (Detail)

v3.7.0.1
Stock Option and Incentive Plans - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2015
Feb. 26, 2013
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Jul. 28, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved pursuant to the plan     26,309,857   26,309,857   31,906,521  
Weighted average period of unvested stock options         2 years 8 months 5 days      
Weighted average grant date fair value of options     $ 1.60 $ 1.73 $ 3.23 $ 3.37    
Unrecognized compensation cost related to unvested stock options     $ 2,677,487   $ 2,677,487      
Employee Stock Options [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Compensation expense recognized     $ 346,892 $ 727,803 $ 474,944 $ 1,555,750    
Amended and Restated 2008 Equity Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved pursuant to the plan   1,571,428            
Termination of service, Period   2 years            
2008 Equity Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Termination of service, Period   10 years            
2014 Omnibus Incentive Plan [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Number of shares of common stock reserved pursuant to the plan               571,429
Number of additional shares increases of common stock reserved pursuant to the plan             3,574,237  
2014 Omnibus Incentive Plan [Member] | Maximum [Member]                
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                
Annual increase of plan, percentage of common stock shares outstanding 4.00%