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Consolidated Statements of Comprehensive Loss (Parenthetical) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Stock based compensation $ 17,437 $ 21,603 $ 25,575
Cost of revenue [Member]
     
Stock based compensation 1,433 1,503 1,745
Research and development [Member]
     
Stock based compensation 4,227 4,828 5,966
Sales and marketing [Member]
     
Stock based compensation 5,160 4,500 4,555
General and administrative [Member]
     
Stock based compensation 6,617 9,538 13,309
Acquisition-related expenses [Member]
     
Stock based compensation $ 0 $ 1,234 $ 0