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Net Income (Loss) Per Share - Computation of Basic and Diluted Net Loss Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator:        
Net income (loss) $ 6,651 $ (37,140) $ (25,764) $ (32,264)
Denominator:        
Weighted average shares used to compute net income (loss) per share, basic (in shares) 144,746 126,194 140,775 124,162
Weighted average shares used to compute net income (loss) per share, diluted (in shares) 146,699 126,194 140,775 124,162
Net income (loss) per share, basic (in dollars per share) $ 0.05 $ (0.29) $ (0.18) $ (0.26)
Net income (loss) per share, diluted (in dollars per share) $ 0.05 $ (0.29) $ (0.18) $ (0.26)
Options to purchase common stock        
Denominator:        
Incremental common shares attributable to dilutive effect (in shares) 485 0 0 0
PSUs and RSUs        
Denominator:        
Incremental common shares attributable to dilutive effect (in shares) 1,462 0 0 0
Employee stock purchase plan        
Denominator:        
Incremental common shares attributable to dilutive effect (in shares) 6 0 0 0