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Stockholders' Equity (Summary of Time-Based RSUs Activity) (Details) - Time-Based Restricted Stock Units (RSUs) [Member]
shares in Thousands
3 Months Ended
Mar. 31, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, outstanding at December 31, 2020 | shares 5,919
Number of shares, granted | shares 2,123
Number of shares, released | shares (1,412)
Number of shares, forfeited | shares (103)
Number of shares, Unvested outstanding at March 31, 2021 | shares 6,527
Weighted average grant date fair value, outstanding at December 31, 2020 | $ / shares $ 5.25
Weighted average grant date fair value, granted | $ / shares 42.39
Weighted average grant date fair value, released | $ / shares 4.45
Weighted average grant date fair value, forfeited | $ / shares 12.10
Weighted average grant date fair value, Unvested outstanding at March 31, 2021 | $ / shares $ 17.40