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Summary of Significant Accounting Policies (Calculation of Basic and Dilutive Net Income (Loss) per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Earnings Per Share, Basic [Abstract] |  |  |  |
Net income (loss) | $ 16,542 | $ (23,708) | $ (111,894) | $ (45,532)
Weighted average shares used in computing net income (loss) per share, basic | 202,194,000 | 166,862,000 | 198,545,000 | 158,195,000
Net income (loss) per share, basic | $ 0.08 | $ (0.14) | $ (0.56) | $ (0.29)
Earnings Per Share, Diluted [Abstract] |  |  |  |
Weighted Average Number of Shares Outstanding, Basic | 202,194,000 | 166,862,000 | 198,545,000 | 158,195,000
Add: Weighted average stock options | 7,754,000 |  |  |
Add: Weighted average restricted stock units | 3,598,000 |  |  |
Add: Weighted average shares issuable pursuant to ESPP | 1,581,000 |  |  |
Weighted average shares used in computing net income (loss) per share, diluted | 215,127,000 | 166,862,000 | 198,545,000 | 158,195,000
Earnings Per Share, Diluted | $ 0.08 | $ (0.14) | $ (0.56) | $ (0.29)

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