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Income taxes (Tables) | 12 Months Ended
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Dec. 31, 2016
Income Tax Disclosure [Abstract] |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] | Loss before provision for income taxes consists of the following:
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | U.S. dollars in thousands |
Domestic (Israel) |  | $ | 15,765 |  |  | $ | 13,388 |  |  | $ | 7,022 |
Foreign (US) |  |  | 41 |  |  |  | 1,953 |  |  |  | - |
|  | $ | 15,806 |  |  | $ | 15,341 |  |  | $ | 7,022 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] | The components of income tax provision consist of the following:
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
|  | U.S. dollars in thousands |
Current Provision for income taxes: |  |  |  |  |  |  |  |  |  |  |  |
Domestic (Israel) |  | $ | 5 |  |  | $ | - |  |  | $ | - |
Foreign (U.S) |  |  | 166 |  |  |  | 24 |  |  |  | - |
Total current provision for income taxes |  | $ | 171 |  |  | $ | 24 |  |  | $ | - |
Previous years adjustments – foreign |  |  | 50 |  |  |  | - |  |  |  | - |
Deferred tax benefit – foreign |  |  | (5) |  |  |  | - |  |  |  | - |
Total provision for income tax |  | $ | 216 |  |  | $ | 24 |  |  | $ | - |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation setting forth the differences between the effective tax rates of the Company and the Israeli statutory tax rate is as follows:
|  | December 31, |
|  | 2016 |  |  | 2015 |  |  | 2014 |
Israeli tax provision at statutory rate |  |  | 25.00 | % |  |  | 26.50 | % |  |  | 26.50 | %
Foreign/state rate differences |  |  | (0.32) | % |  |  | (0.22) | % |  |  | 0.00 | %
Non-deductible stock based compensation |  |  | (1.11) | % |  |  | (4.53) | % |  |  | (2.54) | %
Previous years taxes |  |  | (0.47) | % |  |  | 0.00 | % |  |  | 0.00 | %
Differences form which deferred taxes were not recorded |  |  | 0.19 | % |  |  | 0.20 | % |  |  | 0.00 | %
Changes in valuation allowance |  |  | (18.39) | % |  |  | (22.02) | % |  |  | (5.35) | %
Adjustment of deferred taxes due to tax rate changes |  |  | (5.89) | % |  |  | 0.00 | % |  |  | 0.00 | %
Other permanent differences |  |  | (0.38) | % |  |  | (0.09) | % |  |  | (18.61) | %
|  |  | (1.37) | % |  |  | (0.16) | % |  |  | 0.00 | %
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] | Significant components of the Company’s deferred tax assets are as follows:
|  | December 31, |
|  | 2016 |  | 2015 |
|  | U.S. dollars in thousands |
Operating loss roll forward |  | $ | 5,685 |  | $ | 3,580 |
Reserves and allowances |  |  | 1,956 |  |  | 2,185 |
Net deferred tax asset before valuation allowance |  |  | 7,641 |  |  | 5,765 |
Valuation allowance |  |  | (7,636) |  |  | (5,765) |
|  | $ | 5 |  | $ | - |

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