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Stockholders Equity (Details 5) (USD $)
 6 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Restricted stock units activity under Company's plan    
Number of Shares, beginning balance 3,512,286 3,907,535
Weighted Average Exercise Price Per Share, beginning balance $ 3.39  
Number of Shares, Granted 441,563  
Weighted Average Exercise Price Per Share, Granted $ 2.68  
Number of Shares, Exercised (1,091,613)  
Weighted Average Exercise Price Per Share, Exercised $ 0.90  
Number of Shares, Cancelled (189,478)  
Weighted Average Exercise Price Per Share, Cancelled $ 7.03  
Number of Shares, ending balance 2,672,758 3,907,535
Weighted Average Exercise Price Per Share, ending balance $ 4.03  
Restricted Stock Units (RSUs) [Member]
    
Restricted stock units activity under Company's plan    
Number of Shares, beginning balance 515,834  
Weighted Average Exercise Price Per Share, beginning balance $ 6.30  
Number of Shares, Granted 215,000  
Weighted Average Exercise Price Per Share, Granted $ 2.69  
Number of Shares, Exercised (25,829)  
Weighted Average Exercise Price Per Share, Exercised $ 11.05  
Number of Shares, Cancelled (25,001)  
Weighted Average Exercise Price Per Share, Cancelled $ 11.05  
Number of Shares, ending balance 680,004  
Weighted Average Exercise Price Per Share, ending balance $ 4.81