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Stock Awards (Details Textual) (USD $)
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6 Months Ended | 3 Months Ended | 6 Months Ended | 6 Months Ended | ||||||||||
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Jun. 30, 2012
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Jun. 30, 2011
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Jun. 29, 2012
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Sep. 09, 2011
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Jun. 30, 2012
Stock Options [Member]
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Jun. 30, 2012
Stock Options [Member]
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Jun. 30, 2012
2005 Stock Option Plan [Member]
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Jun. 30, 2012
2012 Equity Incentive Plan [Member]
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Jun. 30, 2012
2012 Employee Stock Purchase Plan [Member]
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Jun. 30, 2012
2005 Stock Plan and 2012 Plan [Member]
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Jun. 30, 2012
June 2012 [Member]
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Jun. 30, 2012
RSUs [Member]
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Jun. 30, 2012
RSUs [Member]
2005 Stock Plan and 2012 Plan [Member]
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Jun. 30, 2012
2012 ESPP [Member]
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| Stock Awards (Textual) [Abstract] | ||||||||||||||
| Total shares of common stock reserved for issuance | 146,216,915 | 11,213,927 | 5,000,000 | |||||||||||
| Number of shares of common stock reserved for issuance, increase, description | January 1 of each year, staring on January 1, 2013 and continuing through January 1, 2022, by up to 5% of the total number of shares of the Company’s common stock outstanding on December 31 of the preceding calendar year as determined by the Company’s board of directors. | January 1 of each calendar year, from January 1, 2013 through January 1, 2022, by up to 1% of the total number of shares of the Company’s common stock outstanding on December 31 of the preceding calendar year. | ||||||||||||
| Total number of shares of common stock outstanding, increase, percentage | 5.00% | 1.00% | ||||||||||||
| Stock options vesting period | 4 years | |||||||||||||
| Stock options granted to new employees vest, percentage per annum | 25.00% | |||||||||||||
| Stock options granted from the date the requisite service period begins and continue to vest, continued employment term period (years) | 3 years | |||||||||||||
| Options granted, exercisable period (years) | 10 years | |||||||||||||
| Stock options subject to performance-based | 275,808 | |||||||||||||
| Term of certain board-approved financial performance targets | 1 year | |||||||||||||
| Target achieved by executive officer | 98.00% | |||||||||||||
| Stock options eligible to vest | 243,744 | |||||||||||||
| Stock-based compensation expense | $ 10,375,000 | $ 1,833,000 | $ 700,000 | $ 800,000 | ||||||||||
| Common Stock Market Price | $ 24.60 | |||||||||||||
| Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options | 74,400,000 | |||||||||||||
| Total unrecognized compensation cost, weighted-average remaining vesting period (years) | 3 years | |||||||||||||
| Restricted stock, shares issued | 263,970 | 453,243 | ||||||||||||
| Unvested shares repurchased | 2,084 | 0 | ||||||||||||
| Compensation expense recognized, vesting term | 48 months | 36 months | 3 years 8 months 5 days | 6 months | ||||||||||
| Purchase price of common stock, percent | 85.00% | |||||||||||||
| Shares issued under the 2012 ESPP | 0 | |||||||||||||
| Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested RSU's | $ 9,700,000 | |||||||||||||
| Weighted-average grant date fair value of the RSUs granted | $ 10.53 | |||||||||||||
| Granted RSU | 1,032,304 | |||||||||||||