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 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Apr. 30, 2014
Apr. 30, 2014
Apr. 30, 2013
Apr. 30, 2014
Minimum
Apr. 30, 2013
Minimum
Apr. 30, 2014
Maximum
Apr. 30, 2013
Maximum
Apr. 30, 2014
Research and development expense
Apr. 30, 2014
Research and development expense
Apr. 30, 2014
General and administrative expense
Apr. 30, 2014
General and administrative expense
Jan. 31, 2014
Officer
Jan. 31, 2014
Officer
Minimum
Jan. 31, 2014
Officer
Maximum
Apr. 30, 2014
Certain Key Employees and Consultants
Apr. 30, 2014
Certain Key Employees and Consultants
Minimum
Apr. 30, 2014
Certain Key Employees and Consultants
Maximum
Oct. 31, 2013
2011 Plan
Consultant
Jan. 31, 2014
2011 Plan
Certain Employees
Jan. 31, 2014
2011 Plan
Certain Employees
Minimum
Jan. 31, 2014
2011 Plan
Certain Employees
Maximum
Apr. 30, 2014
2011 Plan
Employees and directors
Apr. 30, 2014
2011 Plan
Employees and directors
Minimum
Apr. 30, 2014
2011 Plan
Employees and directors
Maximum
Stock-based compensation                                                
Options granted to purchase shares                           1,700,000     4,000,000 500,000 75,000     2,220,000    
Term of stock options                       10 years     10 years     3 years 10 years     10 years    
Vesting period                         2 years 3 years   2 years 3 years     2 years 3 years   2 years 3 years
Exercise price, low end of the range (in dollars per share)                       $ 0.31     $ 0.45       $ 0.31     $ 0.45    
Exercise price, high end of the range (in dollars per share)                       $ 0.54     $ 0.805       $ 0.54     $ 0.805    
Exercise price (in dollars per share)                                   $ 0.26            
Expected volatility, minimum (as a percent)   83.62% 81.92%                                          
Expected volatility, maximum (as a percent)   92.52% 97.85%                                          
Risk-free interest rate, minimum (as a percent)   0.69% 0.31%                                          
Risk-free interest rate, maximum (as a percent)   2.10% 1.97%                                          
Expected forfeiture rate (as a percent)   0.00% 0.00%                                          
Expected term       3 years 3 years 10 years 10 years                                  
Stock-based compensation expense recognized $ 1,105,000 $ 1,397,000           $ 374,000 $ 536,000 $ 731,000 $ 861,000                          
Additional disclosures                                                
Weighted-average grant date fair value (in dollars per share) $ 0.79 $ 0.66