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Warrants - Fair Value Assumptions (Details) $ in Thousands | Dec. 31, 2022 £ / shares | Dec. 31, 2022 USD ($) shares | Dec. 31, 2017 £ / shares shares
--- | --- | --- | ---
Class of Warrant or Right [Line Items] |  |  |
Stock warrants (in shares) | shares |  | 12,401,262 | 31,115,926
Exercise price of stock warrant (in pound sterling per share) | £ / shares | £ 1.7238 |  | £ 1.7238
Expected term to exercise |  | 3 months 29 days |
Calculated value of the warrants, in thousands of U.S. dollars | $ |  | $ 0 |
Risk-free interest rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement Input |  | 0.0007 |
Annualized volatility |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement Input |  | 0.516 |
Dividend rate |  |  |
Class of Warrant or Right [Line Items] |  |  |
Measurement Input |  | 0 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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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 securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 505 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481112/505-10-50-3 + Details
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- Definition Value of input used to measure outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Period between issuance and expiration of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (bbb)(2) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482106/820-10-50-2 + Details
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- Definition Warrant Liability, Current + References No definition available. + Details
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