Annual report pursuant to Section 13 and 15(d)

Stock Option and Purchase Plans (Details 5)

v2.4.0.6
Stock Option and Purchase Plans (Details 5)
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Fair value for the options granted under the Employee Stock Purchase Plan      
Dividend Yield 0.00% 0.00% 0.00%
Employee Stock [Member]
     
Fair value for the options granted under the Employee Stock Purchase Plan      
Risk-free Interest Rate 0.17% 0.10% 0.25%
Dividend Yield 0.00% 0.00% 0.00%
Volatility Factor 0.37% 0.52% 0.40%
Expected Life in Years 1 year 1 year 1 year