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Stockholders' Equity (Details) (USD $)
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12 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||||||||||||||||||||
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Dec. 31, 2013
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Dec. 31, 2013
Stock Options [Member]
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Dec. 31, 2012
Stock Options [Member]
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Dec. 31, 2011
Stock Options [Member]
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Dec. 31, 2013
Employee Stock [Member]
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Dec. 31, 2012
Employee Stock [Member]
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Dec. 31, 2013
Stock Options and Restricted Stock Units, Outstanding [Member]
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Dec. 31, 2013
Reserved for Future Option, Restricted Stock Unit and Other Equity Award Grants [Member]
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Dec. 31, 2013
Reserved for Future ESPP Issuances [Member]
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Dec. 31, 2013
Stock Plans 2000, 2008 and 2009 [Member]
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Dec. 31, 2000
Stock Plan, 2000 [Member]
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Dec. 31, 2000
Stock Plan, 2000 [Member]
Stock Options, Nonqualifying [Member]
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Jan. 28, 2008
Stock Plan, 2008 [Member]
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Nov. 17, 2009
Stock Plan, 2009 [Member]
Stock Options [Member]
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Dec. 31, 2000
Individual Owning 10 Percent or More of Stock [Member]
Stock Plan, 2000 [Member]
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Dec. 31, 2011
Individual Owning 10 Percent or More of Stock [Member]
Stock Plan, 2000 [Member]
Stock Options, Nonqualifying [Member]
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Jan. 28, 2008
Individual Owning 10 Percent or More of Stock [Member]
Stock Plan, 2008 [Member]
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Nov. 17, 2009
Individual Owning 10 Percent or More of Stock [Member]
Stock Plan, 2009 [Member]
Stock Options [Member]
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Jan. 28, 2008
Employee [Member]
Stock Plan, 2008 [Member]
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Nov. 17, 2009
Employee [Member]
Stock Plan, 2009 [Member]
Stock Options [Member]
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Jan. 28, 2008
Directors and Other Service Providers [Member]
Stock Plan, 2008 [Member]
Stock Options, Nonqualifying [Member]
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Nov. 17, 2009
Directors and Other Service Providers [Member]
Stock Plan, 2009 [Member]
Stock Options, Nonqualifying [Member]
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Dec. 31, 2000
Individual Owning 10 Percent or Less of Stock [Member]
Stock Plan, 2000 [Member]
Stock Options, Nonqualifying [Member]
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Nov. 17, 2009
Individual Owning 10 Percent or Less of Stock [Member]
Stock Plan, 2009 [Member]
Stock Options [Member]
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Jan. 02, 2011
Share-based Compensation Award Authorized Number Changes, Lesser of Fixed Amount of Shares [Member]
Stock Plan, 2009 [Member]
Stock Options [Member]
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Jan. 02, 2011
Share-based Compensation Award Authorized Number Changes, Lesser of Outstanding Shares on Last Day of Preceeding Year [Member]
Stock Plan, 2009 [Member]
Stock Options [Member]
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Dec. 31, 2011
Minimum [Member]
Stock Options [Member]
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Dec. 31, 2011
Maximum [Member]
Stock Options [Member]
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | ||||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value | ||||||||||||||||||||||||||||
| Number of shares authorized | 6,750,770 | 21,500,000 | 5,000,000 | 21,000,000 | ||||||||||||||||||||||||
| Percent of market price for non-statutory options | 85.00% | 110.00% | 110.00% | 110.00% | 100.00% | 100.00% | 100.00% | 100.00% | ||||||||||||||||||||
| Minimum stock ownership percent triggering early award expiration | 10.00% | 10.00% | 10.00% | |||||||||||||||||||||||||
| Award expiration period | 5 years | 5 years | 10 years | 7 years | ||||||||||||||||||||||||
| Award vesting period | 4 years | 4 years | ||||||||||||||||||||||||||
| Number of shares authorized before adjustments | 9,000,000 | |||||||||||||||||||||||||||
| Number of shares authorized, maximum | 7,000,000 | |||||||||||||||||||||||||||
| Increase to number of shares authorized, maximum, percent | 5.00% | |||||||||||||||||||||||||||
| Maximum stock ownership percent triggering early award expiration | 10.00% | |||||||||||||||||||||||||||
| Common stock reserved for future issuances | 53,883,000 | 19,720,000 | 27,412,000 | 6,751,000 | 47,131,910 | |||||||||||||||||||||||
| Maximum employee subscription rate | 15.00% | |||||||||||||||||||||||||||
| Purchase price of common stock as percentage of lower of fair market value of common stock on first day of offering period or last day of purchase period | 85.00% | |||||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions and Methodology [Abstract] | ||||||||||||||||||||||||||||
| Expected term in years | 4 years 7 months 6 days | 4 years 7 months 6 days | 4 years 1 month 6 days | 4 years 7 months 6 days | ||||||||||||||||||||||||
| Volatility, minimum | 45.00% | 46.00% | 40.00% | |||||||||||||||||||||||||
| Volatility, maximum | 48.00% | 52.00% | 47.00% | |||||||||||||||||||||||||
| Risk-free interest rate (%) | 1.20% | |||||||||||||||||||||||||||
| Risk-free interest rate, minimum | 0.70% | 0.60% | ||||||||||||||||||||||||||
| Risk-free interest rate, maximum | 0.90% | 2.00% | ||||||||||||||||||||||||||
| Dividend rate (%) | 0.00% | 0.00% | 0.00% | |||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward] | ||||||||||||||||||||||||||||
| Balance - Beginning (in shares) | 18,571,000 | 21,389,000 | 22,489,000 | |||||||||||||||||||||||||
| Granted (in shares) | (258,000) | (3,401,000) | (6,526,000) | |||||||||||||||||||||||||
| Forfeited (in shares) | (820,000) | (1,441,000) | (1,397,000) | |||||||||||||||||||||||||
| Exercised (in shares) | (2,488,000) | (4,778,000) | (6,229,000) | |||||||||||||||||||||||||
| Balance - Ending (in shares) | 15,521,000 | 18,571,000 | 21,389,000 | |||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Roll Forward] | ||||||||||||||||||||||||||||
| Balance - Beginning (in dollars per share) | $ 12.40 | $ 9.14 | $ 4.21 | |||||||||||||||||||||||||
| Granted (in dollars per share) | $ 20.89 | $ 26.38 | $ 21.05 | |||||||||||||||||||||||||
| Forfeited (in dollars per share) | $ 22.14 | $ 19.31 | $ 11.79 | |||||||||||||||||||||||||
| Exercised (in dollars per share) | $ 5.18 | $ 5.69 | $ 3.21 | |||||||||||||||||||||||||
| Balance - Ending (in dollars per share) | $ 13.18 | $ 12.40 | $ 9.14 | |||||||||||||||||||||||||
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract] | ||||||||||||||||||||||||||||
| Options vested and expected to vest, Outstanding (in shares) | 15,496,000 | |||||||||||||||||||||||||||
| Options vested and expected to vest, Weighted average exercise price (in dollars per share) | $ 13.17 | |||||||||||||||||||||||||||
| Options vested and expected to vest, Weighted average remaining contractual life (in years) | 3 years 2 months 28 days | |||||||||||||||||||||||||||
| Options vested and expected to vest, Aggregate intrinsic value | 120,178,000 | |||||||||||||||||||||||||||
| Options exercisable, Outstanding (in shares) | 12,084,000 | |||||||||||||||||||||||||||
| Options exercisable, Weighted average exercise price (in dollars per share) | $ 10.52 | |||||||||||||||||||||||||||
| Options exercisable, Weighted average remaining contractual life (in years) | 2 years 9 months 24 days | |||||||||||||||||||||||||||
| Options exercisable, Aggregate intrinsic value | 118,226,000 | |||||||||||||||||||||||||||
| Compensation cost not yet recognized | 39,500,000 | |||||||||||||||||||||||||||
| Compensation cost not yet recognized period of recognition | 1 year 9 months 18 days | |||||||||||||||||||||||||||
| Weighted-average fair value per share granted | $ 8.42 | $ 11.13 | $ 8.10 | |||||||||||||||||||||||||
| Intrinsic value of options exercised | 41,484,000 | 92,323,000 | 113,590,000 | |||||||||||||||||||||||||
| Total fair value of awards vested | $ 26,411,000 | $ 25,350,000 | $ 11,800,000 | |||||||||||||||||||||||||