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v3.19.1

Segment and related information - Net assets by geographical area (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Segment and related Information [Line Items] |  |
Total net assets | $ 82,724 | $ 80,900
Net assets held for sale [Member] |  |
Segment and related Information [Line Items] |  |
Total net assets | 0 | 15,196
United States [Member] |  |
Segment and related Information [Line Items] |  |
Total net assets | 38,921 | 15,502
Germany [Member] |  |
Segment and related Information [Line Items] |  |
Total net assets | 17,261 | 18,354
United Kingdom [Member] |  |
Segment and related Information [Line Items] |  |
Total net assets | 10,473 | 14,376
Rest Of The World [Member] |  |
Segment and related Information [Line Items] |  |
Total net assets | $ 16,069 | $ 17,472

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