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Employee Stock Plans (Narrative) (Details)
9 Months Ended 9 Months Ended 1 Months Ended 9 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2012
1999 Stock Plan [Member]
Maximum [Member]
Sep. 30, 2012
1999 Stock Plan [Member]
Stock Options [Member]
Sep. 30, 2012
1999 Stock Plan [Member]
Initial Vesting [Member]
Sep. 30, 2012
1999 Stock Plan [Member]
Periodic Vesting [Member]
Apr. 28, 2011
2009 Stock Plan [Member]
Sep. 30, 2012
2009 Stock Plan [Member]
Jan. 01, 2012
2009 Stock Plan [Member]
Sep. 30, 2012
2009 Stock Plan [Member]
Maximum [Member]
Sep. 30, 2012
2009 Stock Plan [Member]
Initial Vesting [Member]
Sep. 30, 2012
2009 Stock Plan [Member]
Periodic Vesting [Member]
Sep. 30, 2012
Employee Stock Purchase Plan [Member]
Sep. 30, 2012
Employee Stock Purchase Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]                        
Equity award, term 10 years             10 years        
Equity award vesting period     1 year 1 month         1 year 1 month    
Percent of options vested     25.00% 2.08%         25.00% 2.08%    
Shares available for grant   0       3,031,000 2,969,000          
Additional shares reserved for issuance         1,500,000 0            
Shares reserved for issuance           6,500,000         2,300,000 2,300,000
Number of previously cancelled, forfeited or repurchased shares available for reissuance               7,500,000        
Maximum percent of employees total compensation allowed for purchase of shares                     20.00% 20.00%
Maximum number of shares per employee per period                     20,000  
Purchase price of shares as a percentage of fair market value                       85.00%
Duration of offering period                       6 months