General and Administrative Expenses (Tables)

12 Months Ended

Dec. 31, 2019

General and Administrative Expenses [Abstract]

Schedule of general and administrative expenses

	Year ended December 31,
	2019		2018		2017
	U.S. dollars in thousands
Salaries and expenses relating to employees and service providers		112		109		247
Expenses relating to options and shares to employees and non-employees		5		22		37
Patents and fees		135		121		158
Directors' fees		132		140		119
Investor relations and travel		27		24		98
Rent and office maintenance		13		18		29
Insurance		106		48		34
Professional services		262		255		*440
Other		15		18		41
		807		755		1,203

(*) An amount of $206 thousands related to F-1 registration and amendments.