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Commitments and Contingent Liabilities (Tables)
12 Months Ended
Dec. 31, 2017
Commitments and Contingent Liabilities [Abstract]  
Schedule of minimum future rental payments
 2018 $172 
 2019  86 
 2020  86 
 2021  87 
 2022  60 
   $491 
Schedule of minimum future lease payments
 2018 $284 
 2019  197 
 2020  94 
 2021  1 
   $576