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Income Taxes (Tables)
12 Months Ended
Dec. 31, 2021
Income Tax Disclosure [Abstract]  
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]
Income (loss) before income taxes consisted of the following for the periods indicated:
 
    
Year Ended December 31
 
    
2021
    
2020
    
2019
 
    
 
 
    
 
 
    
 
 
 
    
U.S. dollars in thousands
 
Domestic (Israel)
     (26,549      (19,935      (26,083
Foreign
     412        447        542  
    
 
 
    
 
 
    
 
 
 
Loss before income taxes
  
 
(26,137
  
 
(19,488
  
 
(25,541
    
 
 
    
 
 
    
 
 
 
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]
    
Year Ended December 31
 
    
2021
    
2020
    
2019
 
    
 
 
    
 
 
    
 
 
 
    
U.S. dollars in thousands
 
Domestic (Israel)
     306        97        281  
Foreign
     101        67        133  
    
 
 
    
 
 
    
 
 
 
Income tax expenses
  
 
407
 
  
 
164
 
  
 
414
 
    
 
 
    
 
 
    
 
 
 
Schedule of Taxes on Income
Taxes on income for the years ended December 31, 2021, 2020 and 2019 were comprised of the following:
 
    
December 31
 
    
2021
    
2020
    
2019
 
    
 
 
    
 
 
    
 
 
 
    
U.S. dollars in thousands
 
Current:
                          
Domestic
     —          —          —    
Foreign
     40        37        25  
    
 
 
    
 
 
    
 
 
 
Total
     40        37        25  
    
 
 
    
 
 
    
 
 
 
Deferred:
                          
Domestic
     —          —          —    
Foreign
     —          —          —    
    
 
 
    
 
 
    
 
 
 
Total
     —          —          —    
    
 
 
    
 
 
    
 
 
 
Provision for income taxes
  
 
40
 
  
 
37
 
  
 
225
 
    
 
 
    
 
 
    
 
 
 
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]
A reconciliation our theoretical income tax expense to actual income tax expense is as follows:
 
    
December 31
 
    
2021
   
2020
   
2019
 
    
 
 
   
 
 
   
 
 
 
    
U.S. dollars in thousands
 
Loss before taxes on income and before Equity in earnings of investee
     (26,137     (19,488     (25,541
Statutory tax rate in Israel
     23     23     23
    
 
 
   
 
 
   
 
 
 
Theoretical tax benefit
     (6,011     (4,482     (5,874
    
 
 
   
 
 
   
 
 
 
Increase (decrease) in taxes resulting from:
                        
Effect of different tax rates applicable in foreign jurisdictions
     1       4       5  
Operating losses and other temporary differences for which valuation allowance was provided
     3,773       3,224       5,203  
Permanent differences
     2,338       1,321       799  
Tax prepayment
     306       97       281  
    
 
 
   
 
 
   
 
 
 
Actual taxes on income
     407       164       414  
    
 
 
   
 
 
   
 
 
 
Schedule of Deferred Tax Assets and Liabilities [Table Text Block]
The components of the Company’s deferred tax assets and liabilities as of December 31, 2021 and 2020 were as follows:
 
    
December 31
 
    
    2021    
    
    2020    
 
    
 
 
    
 
 
 
    
U.S. dollars in thousands
 
Deferred tax assets:
                 
Tax loss carryforwards
     21,221        19,477  
Research and development
     7,526        2,124  
Issuance costs
     2,338        —    
Employee and payroll accrued expenses
     763        654  
Other
     44        42  
    
 
 
    
 
 
 
Total deferred tax assets
     31,892        22,297  
Less valuation allowance for deferred tax assets
     (31,892      (22,297
    
 
 
    
 
 
 
Deferred tax assets
     —           —