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Loss Per Share (Details Textual) - shares
shares in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 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 4.2 5.1