Stock Awards (Details Textual) (USD $)	9 Months Ended					3 Months Ended	9 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 28, 2012	Jun. 30, 2012	Sep. 09, 2011	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member]	Sep. 30, 2012 Stock Options [Member] Executive Officer [Member]	Sep. 30, 2012 2005 Stock Option Plan [Member]	Sep. 30, 2012 2012 Equity Incentive Plan [Member]	Sep. 30, 2012 2012 Employee Stock Purchase Plan [Member]	Sep. 30, 2012 2005 Stock Plan and 2012 Plan [Member]	Sep. 30, 2012 June 2012 [Member]	Sep. 30, 2012 RSUs [Member]	Sep. 30, 2012 RSUs [Member] 2005 Stock Plan and 2012 Plan [Member]	Sep. 30, 2012 2012 ESPP [Member]
Stock Awards (Textual) [Abstract]
Total shares of common stock reserved for issuance	55,049,594								56,231,262	11,635,301	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 granted to new employees vest, percentage per annum								25.00%				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	$ 18,588,000	$ 4,224,000				$ 300,000	$ 1,100,000
Common stock closing price			$ 38.68
Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested stock options	75,300,000
Total unrecognized compensation cost, weighted-average remaining vesting period (years)	2 years 9 months 26 days
Granted RSU	7,085,680													1,135,611
Weighted-average grant date fair value of the RSUs granted														$ 12.71
Aggregate grant date fair value expected to be recognized														14,400,000
Compensation expense														1,400,000
Total unrecognized compensation cost, adjusted for estimated forfeitures, related to unvested RSU's														$ 9,700,000
Compensation expense recognized, vesting term	48 months							4 years					36 months	4 years	3 years 5 months 27 days	6 months
Purchase price of common stock, percent																85.00%
Shares issued under the 2012 ESPP																0