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Additional Information to the Statements of Comprehensive Loss (Details 4) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Additional Information to the Statements of Comprehensive Loss [Abstract]      
Salaries and related benefits $ 3,338 $ 3,365 $ 2,954
Subcontractors 2,620 2,241 1,584
Laboratory materials 687 491 453
Patents 334 198 134
Share-based payment 399 31 180
Travel 112 65 35
Depreciation 39 31 35
Other 604 658 362
Less-Government grants (257) (924) (394)
Research and development expenses, net $ 7,876 $ 6,156 $ 5,343