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Stockholders' Equity (Summary of Performance-Based RSUs Activity) (Details) - RSUs with performance-based vesting [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2021
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, Outstanding at December 31, 2020 | shares 94
Number of shares, Granted | shares
Number of shares, Released | shares
Number of shares, Forfeited | shares (94)
Number of shares, Outstanding at September 30, 2021 | shares
Weighted average grant date fair value, Outstanding at December 31, 2020 | $ / shares $ 2.63
Weighted average grant date fair value, Granted | $ / shares
Weighted average grant date fair value, Released | $ / shares
Weighted average grant date fair value, Forfeited | $ / shares 2.63
Weighted average grant date fair value, Outstanding at September 30, 2021 | $ / shares