Quarterly report pursuant to Section 13 or 15(d)

Stock Option Plans - Additional Information (Detail)

v3.2.0.727
Stock Option Plans - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2015
Jun. 30, 2014
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Milestone recognized total compensation cost $ 144,720 $ 226,844  
Total unrecognized compensation cost related to non-vested options $ 995,813 $ 995,813 $ 315,368
Milestone recognize cost over a weighted average period   4 years 2 months 1 day 2 years 3 months
Share based compensation arrangement by share based payment award compensation cost forfeiture rate 6.00% 6.00% 6.00%
Option Activity for Non-Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Milestone recognized total compensation cost   $ 0 $ 0
Total unrecognized compensation cost related to non-vested options $ 0 $ 0  
Share based compensation arrangement by share based payment award compensation cost forfeiture rate 6.00% 6.00%