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Stockholders' Equity (Summary of Performance-Based RSUs Activity) (Details) - Performance-Based Restricted Stock Units (RSUs) [Member]
shares in Thousands
6 Months Ended
Jun. 30, 2019
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, outstanding at December 31, 2018 | shares 586
Number of shares, granted | shares
Number of shares, released | shares (204)
Number of shares, forfeited | shares (244)
Number of shares, Unvested outstanding at June 30, 2019 | shares 138
Weighted average grant date fair value, outstanding at December 31, 2018 | $ / shares $ 2.58
Weighted average grant date fair value, granted | $ / shares
Weighted average grant date fair value, released | $ / shares 2.57
Weighted average grant date fair value, forfeited | $ / shares 2.57
Weighted average grant date fair value, Unvested outstanding at June 30, 2019 | $ / shares $ 2.63