Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018		2017 (1)		2016 (1)
Units placed		6,237		7,490		5,670
Spare parts and warranties		308		263		199
Total Revenues		6,545		7,753		5,869

(1) As noted above, prior period amounts have not been adjusted under the modified retrospective method.

Schedule of trade receivables and short and long term deferred revenues

	December 31,		December 31,
	2018		2017
Trade receivable, net	$	758	$	1,103
Short and Long term deferred revenues (1)	$	668	$	384

(1) $135 thousand of December 31, 2017 deferred revenues balance were recognized as revenues during the year ended December 31, 2018.

Schedule of Black-Scholes-Merton option pricing model assumptions

	December 31,
	2018			2017			2016
Expected volatility		57% - 61	%		55% - 59	%		53% - 60	%
Risk-free rate		2.74% - 2.83	%		1.78% - 2.07	%		1.16% - 1.60	%
Dividend yield		—	%		—	%		—	%
Expected term (in years)		6.11			5.31 - 6.11			5.31 - 6.11
Share price	$	1.02 - $1.15		$	1.30 - $2.00		$	6.80 - $11.88

Schedule of product warranty liability

	US Dollars in thousands
Balance at December 31, 2017	$	488
Provision		185
Usage		(369	)
Balance at December 31, 2018	$	304

Schedule of concentration of credit risk

	December 31,
	2018			2017
Customer A		*	)		14	%
Customer B		*	)		17	%
Customer C		*	)		10	%
Customer D		28	%		*	)
Customer E		15	%		*	)
Customer F		14	%		*	)
Customer G		13	%		*	)
Customer H		12	%		*	)

*) Less than 10%

Schedule of basic and diluted net loss per ordinary share

	Year ended December 31
	2018			2017			2016
Net loss	$	(21,675	)	$	(24,717	)	$	(32,503	)
Net loss attributable to ordinary shares		(21,675	)		(24,717	)		(32,503	)
Shares used in computing net loss per ordinary shares, basic and diluted		36,812,476			20,214,895			13,178,107
Net loss per ordinary share, basic and diluted	$	(0.59	)	$	(1.22	)	$	(2.47	)