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Stock-based Compensation Plans and Awards (Details) (USD $)
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3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 1 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | 3 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
Employee Stock [Member]
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Jun. 30, 2014
Employee Stock [Member]
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Jun. 30, 2014
Employee Stock [Member]
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Jun. 30, 2014
Employee Stock [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2014
Employee Stock [Member]
Black Scholes Options Pricing Model [Member]
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Dec. 31, 2013
Employee Stock [Member]
Maximum [Member]
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Jun. 30, 2014
Employee and Non Employee Stock Options [Member]
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Jun. 30, 2013
Employee and Non Employee Stock Options [Member]
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Jun. 30, 2014
Employee and Non Employee Stock Options [Member]
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Jun. 30, 2013
Employee and Non Employee Stock Options [Member]
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Jun. 30, 2014
Employee and Non Employee Stock Options [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2013
Employee and Non Employee Stock Options [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2014
Employee and Non Employee Stock Options [Member]
Minimum [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2013
Employee and Non Employee Stock Options [Member]
Minimum [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2014
Employee and Non Employee Stock Options [Member]
Maximum [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2013
Employee and Non Employee Stock Options [Member]
Maximum [Member]
Black Scholes Options Pricing Model [Member]
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Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
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Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
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Jun. 30, 2014
Restricted Stock Units (RSUs) [Member]
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Jun. 30, 2013
Restricted Stock Units (RSUs) [Member]
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| Stock-based Compensation Plans and Awards | ||||||||||||||||||||||||
| Percentage of eligible compensation to purchase common stock through payroll deductions (as a percent) | 15.00% | |||||||||||||||||||||||
| Shares of common stock reserved for issuance | 4,000,000 | |||||||||||||||||||||||
| Amount of eligible compensation per calendar year to purchase common stock | $ 25,000 | |||||||||||||||||||||||
| Offering period | 6 months | |||||||||||||||||||||||
| Exercise price as a percentage of the fair market value of the common stock | 85.00% | |||||||||||||||||||||||
| Assumptions used to calculate per-share fair value of award | ||||||||||||||||||||||||
| Expected life | 6 months | 6 months | 6 years 29 days | 5 years 11 months 27 days | 6 years 29 days | 6 years 3 months 26 days | ||||||||||||||||||
| Risk-free interest rate, maximum (as a percent) | 1.08% | |||||||||||||||||||||||
| Risk-free interest rate (as a percent) | 0.08% | 0.08% | 1.71% | 0.99% | 1.82% | 1.19% | ||||||||||||||||||
| Expected volatility, maximum (as a percent) | 59.00% | |||||||||||||||||||||||
| Expected volatility (as a percent) | 42.00% | 42.00% | 57.00% | 59.00% | 59.00% | |||||||||||||||||||
| Expected dividend yield (as a percent) | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | ||||||||||||||||||
| Vesting term | 4 years | |||||||||||||||||||||||
| Contributions from employees withheld | 1,600,000 | 2,500,000 | ||||||||||||||||||||||
| Stock-based compensation expense | $ 20,613,000 | $ 10,138,000 | $ 38,005,000 | $ 16,662,000 | $ 600,000 | $ 900,000 | $ 3,700,000 | $ 3,300,000 | $ 7,200,000 | $ 5,000,000 | $ 16,300,000 | $ 6,800,000 | $ 29,900,000 | $ 11,700,000 | ||||||||||
| Common stock issued (in shares) | 0 | 0 | ||||||||||||||||||||||
| Shares Available for Grant | ||||||||||||||||||||||||
| Granted (in shares) | 0 | |||||||||||||||||||||||