Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Additional Information (Detail)

v3.3.0.814
Stock Options - Additional Information (Detail) - USD ($)
3 Months Ended 9 Months Ended
Jan. 02, 2015
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 843,527 $ 71,957
Weighted average grant-date fair value, Options granted       $ 1.56  
Total unrecognized compensation expense   $ 1,395,021   $ 1,395,021  
Share based compensation expense, not yet recognized period of recognition       3 years 4 months 10 days  
Two Thousand Fourteen Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Increase in shares reserved for future grants 1,815,683        
Shares available for grant   4,699,135   4,699,135  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 240,664 $ 45,545 $ 843,527 $ 71,857
Expected term in years       7 years 2 months 23 days 6 years 3 months
Stock Options [Member] | Two Thousand Fourteen Equity Incentive Plan [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Aggregate Common stock available for stock options granted, shares   8,666,017   8,666,017  
Stock option, Expiration period       10 years