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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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