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Loss Per Share (Details Textual) - shares
shares in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Employee Stock Option [Member]        
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount 3.5 5.1 3.5 5.1