Quarterly report pursuant to sections 13 or 15(d)

Stock-Based Compensation (Details)

v2.4.0.8
Stock-Based Compensation (Details) (USD $)
3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended 6 Months Ended 3 Months Ended
Jan. 31, 2014
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Minimum
Jan. 31, 2013
Minimum
Jan. 31, 2014
Maximum
Jan. 31, 2013
Maximum
Jan. 31, 2014
Research and development expense
Jan. 31, 2014
Research and development expense
Jan. 31, 2014
General and administrative expense
Jan. 31, 2014
General and administrative expense
Jan. 31, 2014
Officer
Maximum
Jan. 31, 2014
2011 Plan
Employees
Oct. 31, 2013
2011 Plan
Consultant
Jan. 31, 2014
2011 Plan
Employees and officer
Jan. 31, 2014
2011 Plan
Employees and officer
Minimum
Jan. 31, 2014
2011 Plan
Employees and officer
Maximum
Stock-based compensation                                  
Options granted to purchase shares                       1,700,000 75,000 500,000      
Term of stock options                           3 years 10 years    
Vesting period                               2 years 3 years
Exercise price, low end of the range (in dollars per share)                             $ 0.31    
Exercise price, high end of the range (in dollars per share)                             $ 0.54    
Exercise price (in dollars per share)                           $ 0.26      
Expected volatility, minimum (as a percent)   83.62% 79.25%                            
Expected volatility, maximum (as a percent)   92.52% 97.85%                            
Risk-free interest rate, minimum (as a percent)   0.69% 0.36%                            
Risk-free interest rate, maximum (as a percent)   1.87% 1.97%                            
Expected forfeiture rate (as a percent)   0.00% 0.00%                            
Expected term       3 years 3 years 6 years 10 years                    
Stock-based compensation expense recognized $ 222,000 $ 292,000           $ 156,000 $ 163,000 $ 66,000 $ 129,000            
Additional disclosures                                  
Weighted-average grant date fair value (in dollars per share) $ 0.23 $ 0.21