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Consolidated Statements Of Operations (USD $)
In Thousands, except Per Share data, unless otherwise specified
 12 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Consolidated Statements Of Operations [Abstract]      
Revenue $ 344,669 $ 287,043 $ 232,947
Cost of revenue:      
Products and services 195,698 [1] 168,873 [1] 150,863 [1]
Merger-related expenses 19,966    
Amortization of intangible assets 9,552 5,440 5,440
Total cost of revenue 225,216 174,313 156,303
Gross profit 119,453 112,730 76,644
Operating expenses:      
Research and development 67,725 [1] 55,412 [1] 46,132 [1]
Sales and marketing 55,551 [1] 42,121 [1] 33,486 [1]
General and administrative 27,002 [1] 27,998 [1] 15,613 [1]
Merger-related and other expenses 12,927 [1] 3,942 [1]  
Amortization of intangible assets 8,569 740 740
Total operating expenses 171,774 130,213 95,971
Loss from operations (52,321) (17,483) (19,327)
Other income (expense):      
Interest income 87 384 245
Interest expense (184) (1,188) (3,867)
Change in fair value of preferred stock warrants   (173) 37
Other income (expense) 92 (12) 119
Loss before provision for income taxes (52,326) (18,472) (22,793)
Provision for (benefit from) income taxes 224 81 (352)
Net loss (52,550) (18,553) (22,441)
Preferred stock dividends   900 3,747
Net loss attributable to common stockholders $ (52,550) $ (19,453) $ (26,188)
Net loss per common share:      
Basic and diluted $ (1.15) $ (0.65) $ (6.48)
Weighted average number of shares used to compute net loss per common share:      
Basic and diluted 45,546 29,778 4,040
[1] Includes stock-based compensation as follows: Years Ended December 31, 2011 2010 2009 Cost of revenue $ 1,503 $ 1,745 $ 682 Research and development 4,828 5,966 2,657 Sales and marketing 4,500 4,555 1,739 General and administrative 9,538 13,309 4,118 Merger-related and other expenses 1,234 — — $ 21,603 $ 25,575 $ 9,196