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Patents and other intangible assets (Tables) | 9 Months Ended
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Sep. 30, 2013
Goodwill And Intangible Assets Disclosure [Abstract] |
Schedule of Patents and Other Intangible Assets |
(US$ in thousands) |  | September 30, 2013 |  |  | December 31, 2012 |
|  |  |  |  | (Restated) |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 41,135 |  |  | $ | 38,905 |
Trademarks — definite lived |  |  | 632 |  |  |  | 657 |
|  |  | 41,767 |  |  |  | 39,562 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (31,487 | ) |  |  | (31,845 | )
Trademarks — definite lived |  |  | (459 | ) |  |  | (427 | )
|  |  | (31,946 | ) |  |  | (32,272 | )
Patents and other intangible assets, net |  | $ | 9,821 |  |  | $ | 7,290 |

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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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- Details
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