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Geographic And Segment Information (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2016
USD ($)
segment
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Geographic And Segment information [Abstract]      
Number of reportable segments | segment 1    
Revenues | $ $ 0 $ 0 $ 0