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Stockholders' Equity (Summary of Time-Based RSUs Activity) (Details) - Time-Based Restricted Stock Units (RSUs) [Member]
shares in Thousands
9 Months Ended
Sep. 30, 2018
$ / shares
shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]  
Number of shares, outstanding at December 31, 2017 | shares
Number of shares, granted | shares 365
Number of shares, released | shares
Number of shares, forfeited | shares (16)
Number of shares, Unvested outstanding at September 30, 2018 | shares 349
Weighted average grant date fair value, outstanding at December 31, 2017 | $ / shares
Weighted average grant date fair value, granted | $ / shares 2.57
Weighted average grant date fair value, released | $ / shares
Weighted average grant date fair value, forfeited | $ / shares 2.54
Weighted average grant date fair value, Unvested outstanding at September 30, 2018 | $ / shares $ 2.57