Stock Plans (Details 1)
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3 Months Ended | 9 Months Ended | ||||||||||||
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Sep. 30, 2014
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Sep. 30, 2013
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Sep. 30, 2014
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Sep. 30, 2013
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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] | ||||||
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