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Significant Accounting Policies (Recently Adopted Accounting Standards) (Details) - Accounting Standards Update 2014-09 - Cumulative effect due to the adoption of ASUs
$ in Millions
Dec. 31, 2017
USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect due to the adoption of ASUs $ 1.6
Accumulated Deficit  
New Accounting Pronouncements or Change in Accounting Principle [Line Items]  
Cumulative effect due to the adoption of ASUs $ 1.6