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Patents and other intangible assets | 12 Months Ended
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Dec. 31, 2012
Patents and other intangible assets |
4. |  | Patents and other intangible assets
|  | December 31, |
(US$ in thousands) |  | 2012 |  |  | 2011 |
Cost |  |  |  |  |  |  |  |
Patents |  | $ | 37,695 |  |  | $ | 37,683 |
Trademarks—definite lived |  |  | 657 |  |  |  | 545 |
|  |  | 38,352 |  |  |  | 38,228 |
Accumulated amortization |  |  |  |  |  |  |  |
Patents |  |  | (31,045 | ) |  |  | (29,611 | )
Trademarks—definite lived |  |  | (427 | ) |  |  | (381 | )
|  |  | (31,472 | ) |  |  | (29,992 | )
Patents and other intangible assets, net |  | $ | 6,880 |  |  | $ | 8,236 |
Amortization expense for intangible assets is estimated to be approximately $2.1 million, $1.4 million, $1.3 million, $1.2 million, $0.8 million and $0.1 million for the periods ending December 31, 2013, 2014, 2015, 2016, 2017 and 2018 and thereafter, respectively.

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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-Name Statement of Financial Accounting Standard (FAS) -Number 142 -Paragraph 44, 45, 46 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. 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=7658586&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=7658586&loc=d3e16373-109275 Reference 4: 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=7658586&loc=d3e16265-109275 + Details
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