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Loss per Share (Details Textual) - shares
shares in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
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 4.2 5.2