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Shareholders' equity (Tables) | 12 Months Ended
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Dec. 31, 2021
Stockholders Equity Note [Abstract] |
Components of Changes in Accumulated Other Comprehensive Income (Loss) | The components of and changes in accumulated other comprehensive income (loss) are as follows:
(U.S. Dollars, in thousands) |  | Currency Translation Adjustments |  |  | eNeura Debt Security |  |  | Neo Medical Convertible Loans |  |  | Accumulated Other Comprehensive Income (Loss) |
Balance at December 31, 2018 |  | $ | (2,386 | ) |  | $ | 5,682 |  |  | $ | — |  |  | $ | 3,296 |
Cumulative effect adjustment from adoption of ASU 2018-02 |  |  | — |  |  |  | 937 |  |  |  | — |  |  |  | 937 |
Other comprehensive loss |  |  | (653 | ) |  |  | (2,593 | ) |  |  | — |  |  |  | (3,246 | )
Income taxes |  |  | — |  |  |  | 642 |  |  |  | — |  |  |  | 642 |
Reclassification adjustment to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest income (expense), net |  |  | — |  |  |  | (1,034 | ) |  |  | — |  |  |  | (1,034 | )
Other expense, net |  |  | — |  |  |  | (5,193 | ) |  |  | — |  |  |  | (5,193 | )
Income taxes |  |  | — |  |  |  | 1,559 |  |  |  | — |  |  |  | 1,559 |
Balance at December 31, 2019 |  | $ | (3,039 | ) |  | $ | — |  |  | $ | — |  |  | $ | (3,039 | )
Other comprehensive income |  |  | 4,872 |  |  |  | — |  |  |  | 1,881 |  |  |  | 6,753 |
Income taxes |  |  | — |  |  |  | — |  |  |  | (462 | ) |  |  | (462 | )
Balance at December 31, 2020 |  | $ | 1,833 |  |  | $ | — |  |  | $ | 1,419 |  |  | $ | 3,252 |
Other comprehensive loss |  |  | (2,544 | ) |  |  | — |  |  |  | (942 | ) |  |  | (3,486 | )
Income taxes |  |  | — |  |  |  | — |  |  |  | 234 |  |  |  | 234 |
Balance at December 31, 2021 |  | $ | (711 | ) |  | $ | — |  |  | $ | 711 |  |  | $ | — |

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