Quarterly report pursuant to Section 13 or 15(d)

Stock-Based Compensation (Details)

v2.4.0.8
Stock-Based Compensation (Details) (USD $)
3 Months Ended
Oct. 31, 2014
Oct. 31, 2013
Stock-based compensation    
Expected volatility (as a percent)   83.62%
Risk-free interest rate (as a percent)   0.69%
Expected forfeiture rate (as a percent) 0.00% 0.00%
Expected term   3 years
Stock-based compensation expense recognized $ 611,240 $ 70,410
Minimum
   
Stock-based compensation    
Expected volatility, minimum (as a percent) 88.82%  
Risk-free interest rate, minimum (as a percent) 0.36%  
Expected term 2 years  
Maximum
   
Stock-based compensation    
Expected volatility, maximum (as a percent) 92.83%  
Risk-free interest rate, maximum (as a percent) 2.13%  
Expected term 7 years  
Research and development expense
   
Stock-based compensation    
Stock-based compensation expense recognized 316,000 8,000
General and administrative expenses
   
Stock-based compensation    
Stock-based compensation expense recognized $ 295,000 $ 62,000
2011 Plan | Employees
   
Stock-based compensation    
Term of stock options 10 years  
Options granted to purchase shares 2,150,000  
Exercise price, low end of the range (in dollars per share) $ 0.44  
Exercise price, high end of the range (in dollars per share) $ 0.52  
2011 Plan | Employees | Minimum
   
Stock-based compensation    
Vesting period 2 years  
2011 Plan | Employees | Maximum
   
Stock-based compensation    
Vesting period 3 years  
2011 Plan | Consultant
   
Stock-based compensation    
Term of stock options   3 years
Options granted to purchase shares 500,000 500,000
Exercise price, low end of the range (in dollars per share) $ 0.39  
Exercise price, high end of the range (in dollars per share) $ 0.43  
Exercise price (in dollars per share)   $ 0.26
2011 Plan | Consultant | Minimum
   
Stock-based compensation    
Term of stock options 1 year  
2011 Plan | Consultant | Maximum
   
Stock-based compensation    
Term of stock options 3 years