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Patents and other intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2018
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Patents and Other Intangible Assets |
|  |  |  | December 31, |
(U.S. Dollars, in thousands) |  | Weighted Average Amortization Period |  | 2018 |  |  | 2017 |
Cost |  |  |  |  |  |  |  |  |  |
Patents |  | 10 years |  | $ | 39,085 |  |  | $ | 38,621 |
Developed technology |  | 10 years |  |  | 12,400 |  |  |  | — |
IPR&D |  | Indefinite |  |  | 26,800 |  |  |  | — |
License and other |  | 7 years |  |  | 14,654 |  |  |  | 10,276 |
Trademarks—finite lived |  | 9 years |  |  | 840 |  |  |  | 533 |
|  | 9 years |  |  | 93,779 |  |  |  | 49,430 |
Accumulated amortization |  |  |  |  |  |  |  |  |  |
Patents |  |  |  | $ | (35,016 | ) |  | $ | (34,151 | )
Developed technology |  |  |  |  | (827 | ) |  |  | — |
IPR&D |  |  |  |  | — |  |  |  | — |
License and other |  |  |  |  | (5,744 | ) |  |  | (4,625 | )
Trademarks—finite lived |  |  |  |  | (295 | ) |  |  | (193 | )
|  |  |  |  | (41,882 | ) |  |  | (38,969 | )
Patents and other intangible assets, net |  |  |  | $ | 51,897 |  |  | $ | 10,461 |
Schedule of Future Amortization Expense | Future amortization expense for intangible assets, including IPR&D, is estimated as follows:
(U.S. Dollars, in thousands) |  | Amortization |
2019 |  | $ | 6,604 |
2020 |  |  | 6,205 |
2021 |  |  | 6,146 |
2022 |  |  | 6,138 |
2023 |  |  | 5,495 |
Thereafter |  |  | 21,309 |
Total |  | $ | 51,897 |

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- Definition Schedule of finite and indefinite lived intangible assets future amortization expense. + References No definition available. + Details
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- Definition Tabular disclosure of finite lived and indefinite lived intangibles assets, in total and by major class, including the gross carrying amount and accumulated amortization. A major class is composed of intangible assets that can be grouped together because they are similar, either by their nature or by their use in the operations of a company. + References No definition available. + Details
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