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Net (Loss) Income Per Share (Computation Of Basic And Diluted Net Loss Per Share) (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Numerator      
Net (loss) income $ (181,223) $ 29,403 $ (84,134)
Basic      
Weighted average shares used in computing basic net income (loss) per share 204,136 165,187 152,527
Basic net (loss) income per share $ (0.89) $ 0.18 $ (0.55)
Diluted      
Weighted average shares used in computing basic net income (loss) per share 204,136 165,187 152,527
Weighted average shares used in computing diluted net income (loss) per share 204,136 174,970 152,527
Diluted net (loss) income per share $ (0.89) $ 0.17 $ (0.55)
Options to purchase common stock [Member]      
Diluted      
Add: weighted average   6,092  
Restricted Stock Units (RSUs) [Member]      
Diluted      
Add: weighted average   2,324  
ESPP [Member]      
Diluted      
Add: weighted average   1,367