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Patents and other intangible assets | 12 Months Ended
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Dec. 31, 2017
Goodwill And Intangible Assets Disclosure [Abstract] |
Patents and other intangible assets |
4. | Patents and other intangible assets
Patents and other 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. The Company’s weighted average amortization period for developed technologies is 11 years.
|  | December 31, |
(U.S. Dollars, in thousands) |  | 2017 |  |  | 2016 |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 38,621 |  |  | $ | 38,348 |
License and other |  |  | 10,276 |  |  |  | 7,611 |
Trademarks—finite lived |  |  | 533 |  |  |  | 319 |
|  |  | 49,430 |  |  |  | 46,278 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (34,151 | ) |  |  | (34,717 | )
License and other |  |  | (4,625 | ) |  |  | (3,962 | )
Trademarks—finite lived |  |  | (193 | ) |  |  | (138 | )
|  |  | (38,969 | ) |  |  | (38,817 | )
Patents and other intangible assets, net |  | $ | 10,461 |  |  | $ | 7,461 |
Amortization expense for intangible assets was $1.8 million, $1.8 million and $1.7 million for the years ended December 31, 2017, 2016 and 2015, respectively. Future amortization expense for intangible assets is estimated as follows:
(U.S. Dollars, in thousands) |  | Amortization |
2018 |  | $ | 2,352 |
2019 |  |  | 1,909 |
2020 |  |  | 1,366 |
2021 |  |  | 1,321 |
2022 |  |  | 1,314 |
Thereafter |  |  | 2,199 |
Total |  | $ | 10,461 |

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16265-109275 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16373-109275 + Details
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