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Significant Accounting Policies (Details 5)
$ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
Significant Accounting Policies [Abstract]  
Balance at January 1, 2017 $ (47)
Cumulative effect adjustment as a result from transition to ASU 2016-01 (26)
Balance at December 31, 2018 $ (73)