Quarterly report pursuant to Section 13 or 15(d)

Stock Plans (Details 1)

v2.4.0.8
Stock Plans (Details 1)
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Share-based Goods and Nonemployee Services Transaction [Line Items]        
Weighted-average risk-free interest rate 1.70% 0.90% 2.00% 0.90%
Expected dividend payments 0.00% 0.00% 0.00% 0.00%
Expected holding period (years) 4 years 2 months 16 days [1] 3 years 9 months 18 days [1] 6 years 6 months [1] 4 years [1]
Weighted-average volatility factor 1.66% [2] 1.05% [2] 1.66% [2] 1.48% [2]
Estimated forfeiture rates 31.00% [3] 32.00% [3] 31.00% [3] 32.00% [3]
[1] Expected holding periods are based on the simplified method provided in Staff Accounting Bulletin No. 107 for “plain vanilla options.”
[2] Weighted average volatility is based on the historical volatility of our common stock.
[3] Estimated forfeiture rates are based on historical data.