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Summary of Significant Accounting Policies (Computation of Basic and Diluted Net Income (Loss) per Share) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Summary of Significant Accounting Policies [Abstract]
Net lincome (loss)	$ 1,262	$ (30,324)
Basic
Weighted average number of shares used in computing basic net income (loss) per share	153,453	151,274
Basic net income (loss) per share	$ 0.01	$ (0.20)
Diluted
Weighted average number of shares used in computing basic net income (loss) per share	153,453	151,274
Add: weighted average stock options	1,926
Add: weighted average restricted stock units	476
Weighted average number of shares used in computing diluted net income (loss) per share	155,855	151,274
Diluted net income (loss) per share	$ 0.01	$ (0.20)

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