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Employee Stock Purchase Plan (Tables)
3 Months Ended
Dec. 31, 2013
Text Block [Abstract]  
Weighted Average Assumptions of Employee Stock Purchase Plan

The following are the weighted average assumptions used for each respective period:

 

     Three Months Ended
December 31,
     2012   2013

Dividend yield

   0.0%   0.0%

Risk-free interest rate

   0.1%   0.1%

Volatility

   65.9%   41.3%

Expected life

   six months   six months