Quarterly report pursuant to Section 13 or 15(d)

Stock Options - Additional Information (Detail)

v3.2.0.727
Stock Options - Additional Information (Detail) - USD ($)
 3 Months Ended 6 Months Ended
Jan. 01, 2015
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense       $ 602,863 $ 26,412
Weighted average grant-date fair value, Options granted       $ 2.91  
Total unrecognized compensation expense   $ 1,787,899   $ 1,787,899  
Share based compensation expense, not yet recognized period of recognition       3 years 2 months 19 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   4,829,135   4,829,135  
Stock Options [Member]          
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]          
Stock-based compensation expense   $ 300,905 $ 21,040 $ 602,863 $ 26,412
Expected term in years       8 years 7 months 2 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