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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
 3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Numerator:        
Net income $ 32,764 $ 10,589 $ (32,415) $ 4,876
Weighted average shares used to compute net income (loss) per share, basic (in shares) 143,112 123,842 138,756 123,135
Convertible senior notes interest expense, net of tax $ 1,212 $ 0 $ 0 $ 0
Net income (loss), diluted $ 33,976 $ 10,589 $ (32,415) $ 4,876
Denominator:        
Ned (loss) income per share, basic (in dollars per share) $ 0.23 $ 0.09 $ (0.23) $ 0.04
Shares related to convertible senior notes (in shares) 22,875 6,344 0 5,351
Weighted average shares used to compute net income (loss) per share, diluted (in shares) 168,282 133,851 138,756 132,674
Ned (loss) income per share, diluted (in dollars per share) $ 0.20 $ 0.08 $ (0.23) $ 0.04
Options to purchase common stock        
Denominator:        
Incremental common shares attributable to dilutive effect (in shares) 504 958 0 1,013
PSUs and RSUs        
Denominator:        
Incremental common shares attributable to dilutive effect (in shares) 1,791 2,707 0 3,175