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Equity - Disclosure of equity (Details) $ in Thousands | Dec. 31, 2022 USD ($) shares | Dec. 31, 2022 £ / shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2021 £ / shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($)
--- | --- | --- | --- | --- | --- | ---
Equity [abstract] |  |  |  |  |  |
Share capital | $ 5,455 |  | $ 5,444 |  |  |
Merger reserve | 138,506 |  | 138,506 |  |  |
Share premium | 289,624 |  | 289,303 |  |  |
Treasury stock | (26,492) |  | 0 |  |  |
Translation reserve | 89 |  | 469 |  |  |
Other reserve | (14,478) |  | (40,077) |  |  |
Retained earnings/(accumulated deficit) | 149,516 |  | 199,871 |  |  |
Equity attributable to the owners of the Company | 542,220 |  | 593,515 |  |  |
Non-controlling interests | 5,369 |  | (9,368) |  |  |
Total equity | $ 547,589 |  | $ 584,147 |  | $ 653,539 | $ 650,398
Par value per share (in GBP per share) | £ / shares |  | £ 0.01 |  | £ 0.01 |  |
Number of shares issued and fully paid (in shares) | shares | 278,566,306 |  | 287,796,585 |  |  |

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- Definition The amount of equity attributable to the owners of the parent. This specifically excludes non-controlling interest. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2022-03-24 -Paragraph 54 -Subparagraph r -URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=1&code=ifrs-tx-2022-en-r&anchor=para_54_r&doctype=Standard -URIDate 2022-03-24 + Details
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