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Stockholders' Equity (Summary of Time-Based RSUs Activity) (Details) - Time-Based Restricted Stock Units (RSUs) [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2020
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, outstanding at December 31, 2019 | shares 1,086
Number of shares, granted | shares 5,280
Number of shares, released | shares (858)
Number of shares, forfeited | shares (399)
Number of shares, Unvested outstanding at June 30, 2020 | shares 5,109
Weighted average grant date fair value, outstanding at December 31, 2019 | $ / shares $ 6.12
Weighted average grant date fair value, granted | $ / shares 4.34
Weighted average grant date fair value, released | $ / shares 6.78
Weighted average grant date fair value, forfeited | $ / shares 4.47
Weighted average grant date fair value, Unvested outstanding at June 30, 2020 | $ / shares $ 4.30