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Loss per Share (Details Textual) - shares
shares in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]      
Antidilutive Securities Excluded From Computation Of Earnings Per Share, Amount     2.2
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 5.2 3.9 1.4