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Stockholders' Equity (Tables)
12 Months Ended
Sep. 30, 2014
Equity [Abstract]  
Fair Value Calculations for Stock-Based Compensation Awards

The fair value calculations for stock-based compensation awards to employees for the fiscal years ended September 30, 2013 and 2012 were based on the following assumptions:

 

     2013    2012

Risk-free interest rate

   0.18% - 1.20%    0.35% - 1.06%

Expected life (years)

   5.3    5.0

Expected volatility

   175%    110%

Expected dividends

   None    None
Stock-Based Compensation Expense Related to Stock Options and RSUs

The following table summarizes stock-based compensation expense related to stock options and RSUs under ASC 718 for the fiscal years ended September 30, 2014, 2013 and 2012, which were allocated as follows:

 

     2014      2013      2012  

Sales and marketing

   $ 823,876       $ 433,130       $ 471,716   

Research and development

     675,033         617,377         592,249   

General and administrative

     1,945,571         1,741,355         1,535,893   
  

 

 

    

 

 

    

 

 

 

Stock-based compensation expense related to employee stock options included in operating expenses

   $ 3,444,480       $ 2,791,862       $ 2,599,858   
  

 

 

    

 

 

    

 

 

 
Summary of Vested and Unvested Options, Weighted Average Exercise Price per Share, Weighted Average Remaining Term and Aggregate Intrinsic Value

The following table summarizes vested and unvested options, weighted average exercise price per share, weighted average remaining term and aggregate intrinsic value at September 30, 2014:

 

     Number of Shares      Weighted Average
Exercise Price Per
Share
     Weighted Average
Remaining
Contractual Life
(in Years)
     Aggregate Intrinsic
Value
 

Vested

     1,878,695       $ 3.94         5.00       $ 1,090,096   

Unvested

     455,631       $ 4.80         7.33         8,084   
  

 

 

          

 

 

 

Total

     2,334,326       $ 4.11         5.46       $ 1,098,180   
  

 

 

          

 

 

 
Stock Option Activity

The following table summarizes stock option activity under the Company’s stock option plans during the fiscal years ended September 30, 2014, 2013 and 2012:

 

     Number of
Shares
    Weighted Average
Exercise Price Per
Share
     Weighted Average
Remaining
Contractual Term
(in Years)
 

Outstanding, September 30, 2011

     4,553,904      $ 1.34         6.15   

Granted

     1,095,750      $ 8.54      

Exercised

     (1,812,215   $ 0.81      

Cancelled

     (325,153   $ 6.41      
  

 

 

      

Outstanding, September 30, 2012

     3,512,286      $ 3.39         6.46   

Granted

     651,563      $ 3.63      

Exercised

     (1,103,582   $ 0.90      

Cancelled

     (235,303   $ 7.26      
  

 

 

      

Outstanding, September 30, 2013

     2,824,964      $ 4.09         7.29   

Granted

     —        $ —        

Exercised

     (108,135   $ 1.27      

Cancelled

     (382,503   $ 4.77      
  

 

 

      

Outstanding, September 30, 2014

     2,334,326      $ 4.11         5.46   
  

 

 

      
Significant Ranges of Outstanding and Exercisable Options

The following table summarizes significant ranges of outstanding and exercisable options as of September 30, 2014:

 

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 to $0.79      336,762         5.24       $ 0.73         336,762       $ 0.73         —     
$0.80 to $1.10      350,000         1.39       $ 0.93         350,000       $ 0.93         —     
$2.34 to $2.60      726,421         6.60       $ 2.52         491,671       $ 2.54         234,750   
$3.33 to $9.97      635,000         5.74       $ 6.33         501,023       $ 6.74         133,977   
$11.05 to $11.68      286,143         7.15       $ 11.08         199,239       $ 11.08         86,904   
  

 

 

          

 

 

       

 

 

 
     2,334,326         5.46       $ 4.11         1,878,695       $ 3.94         455,631   
  

 

 

          

 

 

       

 

 

 
Number of Stock Options Outstanding under Prior Plans

The following table summarizes the number of stock options outstanding under the Prior Plans as of September 30, 2014:

 

2000 Stock Option Plan

     206,262   

2002 Stock Option Plan

     191,000   

2006 Stock Option Plan

     43,000   

2010 Stock Option Plan

     1,050,321   
  

 

 

 

Total stock options outstanding under the Prior Plans

     1,490,583   
  

 

 

 
RSU Activity

The following table summarizes RSU activity in the fiscal years ended September 30, 2014, 2013 and 2012:

 

     Number of
shares
    Weighted-average
fair value per share
 

Outstanding at September 30, 2011

     300,000      $ 5.12   

Granted

     255,835      $ 8.44   

Settled

     —          —     

Cancelled

     (40,001     11.05   
  

 

 

   

Outstanding at September 30, 2012

     515,834      $ 6.30   

Granted

     255,000      $ 3.15   

Settled

     (50,829     7.76   

Cancelled

     (27,501   $ 11.05   
  

 

 

   

Outstanding at September 30, 2013

     692,504      $ 4.85   

Granted

     625,139      $ 4.83   

Settled

     (63,334   $ 4.66   

Cancelled

     (153,006   $ 5.03   
  

 

 

   

Outstanding at September 30, 2014

     1,101,303      $ 4.71