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Intangible assets - Finite-lived intangible assets and estimated future amortization expense (Details) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Intangible assets |  |
Average remaining life (in years) | 16 years 2 months 12 days |
Historical costs | $ 12,707 | $ 10,810
Accumulated amortization | (4,383) | (3,995)
Carrying amount | 8,324 | 6,815
Estimated future amortization expense |  |
2017 | 569 |
2018 | 566 |
2019 | 533 |
2020 | 513 |
2021 | 509 |
Thereafter | 5,634 |
Carrying amount | $ 8,324 | 6,815
Licenses |  |
Intangible assets |  |
Average remaining life (in years) | 14 years 9 months 18 days |
Historical costs | $ 7,799 | 5,730
Accumulated amortization | (3,952) | (3,816)
Carrying amount | 3,847 | 1,914
Estimated future amortization expense |  |
Carrying amount | $ 3,847 | 1,914
Acquired R&D |  |
Intangible assets |  |
Average remaining life (in years) | 17 years 3 months 18 days |
Historical costs | $ 4,908 | 5,080
Accumulated amortization | (431) | (179)
Carrying amount | 4,477 | 4,901
Estimated future amortization expense |  |
Carrying amount | $ 4,477 | $ 4,901

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- Definition Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized after the fifth fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References No definition available. + Details
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- Definition Amount of amortization expense for assets, excluding financial assets and goodwill, lacking physical substance with a finite life expected to be recognized during the next fiscal year following the latest fiscal year. Excludes interim and annual periods when interim periods are reported on a rolling approach, from latest balance sheet date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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- Definition Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66006027&loc=d3e16323-109275 + Details
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