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SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2020
Accounting Policies [Abstract]  
Schedule of property and equipment estimated useful lives
Property and equipment are stated at cost, net of accumulated depreciation. Depreciation is calculated using the straight-line method over the estimated useful lives of the assets at the following annual rates: 
 
 
%
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,
  
 
  
2020
    
2019
    
2018
  
Units placed
  
$
3,620
    
$
4,385
    
$
6,237
  
Spare parts and warranties
    
773
      
488
      
308
  
Total Revenues
  
$
4,393
    
$
4,873
    
$
6,545
Schedule of trade receivables and short and long term deferred revenues
 
  
December 31,
    
December 31,
  
 
  
2020
    
2019
  
Trade receivable, net (1)
  
$
684
    
$
794
  
Deferred revenues (1) (2)
  
$
1,108
    
$
844
  
 
(1)
Balance presented net of unrecognized revenues that were not yet collected.
 
(2)
$330 thousand of December 31, 2019 deferred revenues balance were recognized as revenues during the year ended December 31, 2020.
Schedule of Black-Scholes-Merton option pricing model assumptions
The fair value for options granted in 2019, 2018 is estimated at the date of grant using a Black-Scholes-Merton option pricing model with the following assumptions:
 
 
  
Year Ended December 31,
  
 
  
2019
    
2018
  
Expected volatility
    
57.5
%
    
57% - 61
%
Risk-free rate
    
2.22
%
    
2.74% - 2.83
%
Dividend yield
    
—
%
    
—
%
Expected term (in years)
    
6.11
      
6.11
  
Share price
  
$
5.37
    
$
25.5 - $28.75
Schedule of product warranty liability
 
  
US Dollars
in
thousands
  
Balance at December 31, 2019
  
$
227
  
Provision
    
125
  
Usage
    
(212
)
Balance at December 31, 2020
    
140
Schedule of concentration of credit risk
Concentration of credit risk with respect to trade receivable is primarily limited to a customer to which the Company makes substantial sales.
 
 
  
December 31,
  
 
  
2020
    
2019
  
Customer A
    
15
%
    
*
)
Customer B
    
15
%
    
*
)
Customer C
    
15
%
    
*
)
Customer D
    
14
%
    
*
)
Customer E
    
12
%
    
12
%
Customer F
    
11
%
    
*
)
Customer G
    
*
)
    
14
%
Customer H
    
*
)
    
13
%
Customer I
    
*
)
    
13
%
Customer J
    
*
)
    
12
%
Customer K
    
*
)
    
12
%
Customer L
    
*
)
    
12
%
 
*)
Less than 10%
Schedule of basic and diluted net loss per ordinary share
The following table sets forth the computation of the Company’s basic and diluted net loss per ordinary share (in thousands, except share and per share data):
 
 
  
Year ended December 31,
  
 
  
2020
    
2019
    
2018
  
Net loss
  
$
(12,976
)
  
$
(15,551
)
  
$
(21,675
)
 
                        
Net loss attributable to ordinary shares
    
(12,976
)
    
(15,551
)
    
(21,675
)
Shares used in computing net loss per ordinary shares, basic and diluted
    
15,764,980
      
5,763,317
      
1,472,499
  
 
                        
Net loss per ordinary share, basic and diluted
  
$
(0.82
)
  
$
(2.70
)
  
$
(14.72
)