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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals)	Sep. 30, 2023 $ / shares shares	Sep. 30, 2023 £ / shares shares	Dec. 31, 2022 $ / shares shares	Dec. 31, 2022 £ / shares shares
Ordinary shares
Shareholders' equity:
Stock par value (usd/gbp per share) | $ / shares	$ 0.000042		$ 0.000042
Shares authorized (in shares)	290,909,783	290,909,783	290,909,783	290,909,783
Shares issued (in shares)	173,936,794	173,936,794	173,074,510	173,074,510
Shares outstanding (in shares)	173,936,794	173,936,794	173,074,510	173,074,510
Deferred shares
Shareholders' equity:
Stock par value (usd/gbp per share) | £ / shares		£ 0.00001		£ 0.00001
Shares authorized (in shares)	34,425	34,425	34,425	34,425
Shares issued (in shares)	34,425	34,425	34,425	34,425
Shares outstanding (in shares)	34,425	34,425	34,425	34,425
Deferred B Shares
Shareholders' equity:
Stock par value (usd/gbp per share) | £ / shares		£ 0.00099		£ 0.00099
Shares authorized (in shares)	88,893,548	88,893,548	88,893,548	88,893,548
Shares issued (in shares)	88,893,548	88,893,548	88,893,548	88,893,548
Shares outstanding (in shares)	88,893,548	88,893,548	88,893,548	88,893,548
Deferred C Shares
Shareholders' equity:
Stock par value (usd/gbp per share) | £ / shares		£ 0.000008		£ 0.000008
Shares authorized (in shares)	1	1	1	1
Shares issued (in shares)	1	1	1	1
Shares outstanding (in shares)	1	1	1	1

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Face amount or stated value per share of common stock.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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