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Stockholders' Equity (Summary of Time-Based RSUs Activity) (Details) - RSUs with time-based vesting [Member]
shares in Thousands
12 Months Ended
Dec. 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 3,744
Number of shares, Released | shares (1,798)
Number of shares, Forfeited | shares (473)
Number of shares, Outstanding at December 31, 2021 | shares 7,392
Weighted average grant date fair value, Outstanding at December 31, 2020 | $ / shares $ 5.25
Weighted average grant date fair value, per share | $ / shares 5.13
Weighted average grant date fair value, Released | $ / shares 16.68
Weighted average grant date fair value, Forfeited | $ / shares 19.78
Weighted average grant date fair value, Outstanding at December 31, 2021 | $ / shares $ 35.33