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Stockholders' Equity (Tables)
6 Months Ended
Mar. 31, 2013
Stockholders' Equity [Abstract]  
Stock-based compensation expense related to stock options and restricted stock unit awards
                                 
    Three Months Ended
March 31,
    Six Months Ended
March 31,
 
    2013     2012     2013     2012  

Sales and marketing

  $ 98,651     $ 111,178     $ 175,303     $ 180,741  

Research and development

    162,481       176,607       286,060       283,826  

General and administrative

    442,467       363,402       898,770       688,317  
   

 

 

   

 

 

   

 

 

   

 

 

 

Stock-based compensation expense included in operating expenses

  $ 703,599     $ 651,187     $ 1,360,133     $ 1,152,884  
   

 

 

   

 

 

   

 

 

   

 

 

 
Fair value calculations for stock-based compensation awards to employees
         
    Six Months Ended
March 31, 2013
  Six Months Ended
March 31, 2012

Risk-free interest rate

  0.18 – 0.81%   0.35 – 1.06%

Expected life (years)

  4.98   4.69

Expected volatility

  167%   90%

Expected dividends

  None   None
Stock option activity under the Company's equity plans
                         
    Number of
Shares
    Weighted Average
Exercise Price
    Weighted Average
Remaining
Contractual Term
(in Years)
 

Outstanding, September 30, 2012

    3,512,286     $     3.39       6.46  

Granted

    441,563     $ 2.68          

Exercised

    (1,091,613   $ 0.90          

Cancelled

    (189,478   $ 7.03          
   

 

 

                 

Outstanding, March 31, 2013

    2,672,758     $ 4.03       7.62  
   

 

 

                 
Significant ranges of outstanding and exercisable options
                                                 

Range of Exercise Prices

  Number of
Options
Outstanding
    Weighted
Average
Remaining
Contractual Life
(in Years)
    Weighted
Average
Exercise Price
    Number of
Exercisable
Options
    Weighted
Average
Exercise Price of
Exercisable
Options
    Number of
Unvested
Options
 

$0.09 – $ 0.79

    413,491       6.77     $ 0.74       413,491     $ 0.74       —    

$0.80 – $ 1.95

    365,014       2.98     $ 0.94       362,651     $ 0.94       2,363  

$2.34 – $ 2.60

    805,752       8.34     $ 2.51       236,430     $ 2.60       569,322  

$3.33 – $ 9.97

    760,751       8.99     $ 5.86       127,827     $ 9.07       632,924  

$11.05 – $ 11.68

    327,750       8.88     $ 11.08       102,845     $ 11.08       224,905  
   

 

 

                   

 

 

           

 

 

 
      2,672,758       7.62     $ 4.03       1,243,244     $ 2.86       1,429,514  
   

 

 

                   

 

 

           

 

 

 
Number of stock options outstanding under prior plans
         

2000 Stock Option Plan

    216,392  

2002 Stock Option Plan

    230,419  

2006 Stock Option Plan

    49,000  

2010 Stock Option Plan

    1,136,134  
   

 

 

 

Total stock options outstanding under the Prior Plans

    1,631,945  
   

 

 

 
Restricted stock units activity under Company's plan
                 
    Number of
Shares
    Weighted Average
Fair Market Value
Per Share
 

Outstanding, September 30, 2012

    515,834     $ 6.30  

Granted

    215,000     $ 2.69  

Settled

    (25,829   $     11.05  

Cancelled

    (25,001   $ 11.05  
   

 

 

         

Outstanding, March 31, 2013

    680,004     $ 4.81