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General and Administrative Expenses (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Statement Line Items [Line Items]      
General and administrative expenses $ 1,925 $ 2,150 $ 2,123
Payroll and related expenses [Member]      
Statement Line Items [Line Items]      
General and administrative expenses 667 661 382
Share based payment [Member]      
Statement Line Items [Line Items]      
General and administrative expenses 190 576 902
Professional Fees [Member]      
Statement Line Items [Line Items]      
General and administrative expenses 885 749 731
Other [Member]      
Statement Line Items [Line Items]      
General and administrative expenses $ 183 $ 164 $ 108