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Income Taxes (Tables) | 12 Months Ended
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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 |  |  | — |  |  |  | — |

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