Quarterly report pursuant to sections 13 or 15(d)

Stock-Based Compensation (Details)

v2.4.0.6
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 1 Months Ended 3 Months Ended
Jan. 31, 2013
Jan. 31, 2013
Jan. 31, 2012
Jan. 31, 2013
Maximum
Jan. 31, 2012
Maximum
Jan. 31, 2013
Minimum
Jan. 31, 2012
Minimum
Jan. 31, 2013
Research and development expense
Jan. 31, 2013
Research and development expense
Jan. 31, 2013
General and administrative expense
Jan. 31, 2013
General and administrative expense
Oct. 31, 2012
Employees
Oct. 31, 2012
Employees
Maximum
Oct. 31, 2012
Employees
Minimum
Jan. 31, 2013
Consultant
Oct. 31, 2012
Consultant
May 31, 2011
2011 Plan
May 31, 2011
2011 Plan
Maximum
May 31, 2011
2011 Plan
Minimum
Jan. 31, 2013
2011 Plan
Consultant
Stock-based compensation                                        
Number of shares authorized                                 5,200,000      
Purchase price of incentive stock options as a percentage of its fair value                                     100.00%  
Term of stock options                       10 years       3 years   10 years   10 years
Provisional percentage of outstanding stock owned by stockholders                                     10.00%  
Exercise price as a percentage of fair value of common stock for stockholders who own more than 10% of outstanding stock                                     110.00%  
Options granted to purchase shares   1,385,000                   155,000       1,200,000       30,000
Vesting period                         3 years 2 years           1 year
Exercise price, high end of the range (in dollars per share)                       $ 0.42                
Exercise price, low end of the range (in dollars per share)                       $ 0.20                
Exercise price (in dollars per share)                             $ 0.35 $ 0.18        
Expected volatility, minimum (as a percent)   79.25% 85.96%                                  
Expected volatility, maximum (as a percent)   97.85% 91.65%                                  
Risk-free interest rate (as a percent)       1.97% 2.08% 0.36% 0.96%                          
Expected forfeiture rate (as a percent)   0.00% 0.00%                                  
Expected term       10 years 10 years 3 years 5 years                          
Stock-based compensation expense recognized $ 87,000 $ 267,000           $ 10,000 $ 30,000 $ 77,000 $ 237,000                  
Option Shares Outstanding                                        
Balance at the beginning of the period (in shares)   3,175,000                                    
Granted (in shares)   1,385,000                   155,000       1,200,000       30,000
Exercised (in shares)   (750,000)                                    
Forfeited/Cancelled (in shares)   (124,500)                                    
Balance at the end of the period (in shares) 3,685,500 3,685,500                                    
Weighted-Average Exercise Price                                        
Balance at the beginning of the period (in dollars per share)   $ 0.24                                    
Granted (in dollars per share)   $ 0.19                                    
Exercised (in dollars per share)   $ 0.18                                    
Forfeited/Cancelled (in dollars per share)   $ 0.33                                    
Balance at the end of the period (in dollars per share) $ 0.23 $ 0.23                                    
Aggregate Intrinsic Value                                        
Balance at the beginning of the period (in dollars)   24,000                                    
Granted (in dollars)   51,000                                    
Exercised (in dollars)   50,000                                    
Balance at the end of the period (in dollars) $ 69,000 $ 69,000