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Intangible assets (Tables) | 12 Months Ended
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Dec. 31, 2019
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Intangible Assets | Intangible assets are recorded at cost, or when acquired as a part of a business combination, at estimated fair value. These assets are amortized on a straight-line basis over the useful lives of the assets.
|  |  |  | December 31, |
(U.S. Dollars, in thousands) |  | Weighted Average Amortization Period |  | 2019 |  |  | 2018 |
Cost |  |  |  |  |  |  |  |  |  |
Patents |  | 10 years |  | $ | 42,034 |  |  | $ | 39,085 |
Developed technology |  | 10 years |  |  | 39,200 |  |  |  | 12,400 |
IPR&D |  | Indefinite |  |  | — |  |  |  | 26,800 |
Customer relationships |  | 9 years |  |  | 7,430 |  |  |  | — |
License and other |  | 7 years |  |  | 15,960 |  |  |  | 14,654 |
Trademarks—finite lived |  | 10 years |  |  | 942 |  |  |  | 840 |
|  | 9 years |  |  | 105,566 |  |  |  | 93,779 |
Accumulated amortization |  |  |  |  |  |  |  |  |  |
Patents |  |  |  | $ | (38,246 | ) |  | $ | (35,016 | )
Developed technology |  |  |  |  | (4,523 | ) |  |  | (827 | )
Customer relationships |  |  |  |  | (535 | ) |  |  | — |
License and other |  |  |  |  | (7,701 | ) |  |  | (5,744 | )
Trademarks—finite lived |  |  |  |  | (422 | ) |  |  | (295 | )
|  |  |  |  | (51,427 | ) |  |  | (41,882 | )
Patents and other intangible assets, net |  |  |  | $ | 54,139 |  |  | $ | 51,897 |
Schedule of Future Amortization Expense | Future amortization expense for intangible assets is estimated as follows:
(U.S. Dollars, in thousands) |  | Amortization |
2020 |  | $ | 7,420 |
2021 |  |  | 7,317 |
2022 |  |  | 7,337 |
2023 |  |  | 6,668 |
2024 |  |  | 5,799 |
Thereafter |  |  | 19,598 |
Total |  | $ | 54,139 |

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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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