Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2019

Accounting Policies [Abstract]

Schedule of property and equipment estimated useful lives

	%
Computer equipment	20-33 (mainly 33)
Office furniture and equipment	6 - 10 (mainly 10)
Machinery and laboratory equipment	15
Field service units	50
Leasehold improvements	Over the shorter of the lease term or estimated useful life

Schedule of disaggregation of revenues

	Year Ended December 31,
	2019		2018		2017 (1)
Units placed	$	4,385	$	6,237	$	7,490
Spare parts and warranties		488		308		263
Total Revenues	$	4,873	$	6,545	$	7,753

Schedule of trade receivables and short and long term deferred revenues

	December 31,		December 31,
	2019		2018
Trade receivable, net (1)	$	794	$	758
Deferred revenues (1) (2)	$	844	$	668

(1) Balance presented net of unrecognized revenues that were not yet collected.

(2) $262 thousand of December 31, 2018 deferred revenues balance were recognized as revenues during the year ended December 31, 2019.

Schedule of Black-Scholes-Merton option pricing model assumptions

	December 31,
	2019			2018			2017
Expected volatility		57.5	%		57% - 61	%		55% - 59	%
Risk-free rate		2.22	%		2.74% - 2.83	%		1.78% - 2.07	%
Dividend yield		—	%		—	%		—	%
Expected term (in years)		6.11			6.11			5.31 - 6.11
Share price	$	5.37		$	25.2 - $28.75		$	32.5 - $50

Schedule of product warranty liability

	US Dollars in thousands
Balance at December 31, 2018	$	304
Provision		166
Usage		(243	)
Balance at December 31, 2019		227

Schedule of concentration of credit risk

	December 31,
	2019			2018
Customer A		14	%		*	)
Customer B		13	%		*	)
Customer C		13	%		*	)
Customer D		12	%		*	)
Customer E		12	%		*	)
Customer F		12	%		*	)
Customer G		12	%		*	)
Customer H		*	)		28	%
Customer I		*	)		15	%
Customer J		*	)		14	%
Customer K		*	)		13	%
Customer L		*	)		12	%

*) Less than 10%

Schedule of basic and diluted net loss per ordinary share

	Year ended December 31,
	2019			2018			2017
Net loss	$	(15,551	)	$	(21,675	)	$	(24,717	)
Net loss attributable to ordinary shares		(15,551	)		(21,675	)		(24,717	)
Shares used in computing net loss per ordinary shares, basic and diluted		5,763,317			1,472,499			808,557
Net loss per ordinary share, basic and diluted	$	(2.70	)	$	(14.72	)	$	(30.57	)