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Geographic And Segment Information (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
segment
Jun. 30, 2017
USD ($)
Geographic And Segment information [Abstract]        
Number of reportable segments | segment     1  
Revenues | $ $ 0 $ 0 $ 0 $ 0