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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Accrued Liabilities [Abstract]    
Drilling provisions $ 156 $ 1,077
Employees related 177 166
Interest on convertible bonds 231 231
Audit and Related Costs 194 148
Other 200 79
Total accrued liabilities $ 958 $ 1,701