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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	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Numerator
Net income (loss)	$ 29,403	$ (84,134)	$ (102,562)
Basic
Weighted average shares used in computing basic net income (loss) per share	165,187	152,527	135,094
Basic net income (loss) per share	$ 0.18	$ (0.55)	$ (0.76)
Diluted
Weighted average shares used in computing basic net income (loss) per share	165,187	152,527	135,094
Weighted average shares used in computing diluted net income (loss) per share	174,970	152,527	135,094
Diluted net income (loss) per share	$ 0.17	$ (0.55)	$ (0.76)
Stock Options [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

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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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