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Share based compensation - Share Options Issued (Details) - Share options - $ / shares | 1 Months Ended | 12 Months Ended
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Aug. 31, 2021 | Mar. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock based compensation (in shares) | 5,150,000 | 230,000 |  |  |
Exercise price (in dollars per share) | $ 2.00 | $ 35.00 | $ 2.00 | $ 0 | $ 35.00
Share price (in dollars per share) | $ 1.40 | $ 28.40 |  |  |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Number of shares issued under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options. + References No definition available. + Details
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- Details
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