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Condensed Consolidated Balance Sheets (Unaudited) (Parentheticals) | Mar. 31, 2021 $ / shares shares | Mar. 31, 2021 £ / shares shares | Dec. 31, 2020 $ / shares shares | Dec. 31, 2020 £ / shares shares
--- | --- | --- | --- | ---
Ordinary shares |  |  |  |
Shareholders' equity: |  |  |  |
Stock par value (usd/gbp per share) | $ / shares | $ 0.000042 |  | $ 0.000042 |
Shares authorized | 200,000,000 | 200,000,000 | 200,000,000 | 200,000,000
Shares issued | 70,515,354 | 70,515,354 | 52,346,231 | 52,346,231
Shares outstanding | 70,515,354 | 70,515,354 | 52,346,231 | 52,346,231
Deferred shares |  |  |  |
Shareholders' equity: |  |  |  |
Stock par value (usd/gbp per share) | £ / shares |  | £ 0.00001 |  | £ 0.00001
Shares authorized | 34,425 | 34,425 | 34,425 | 34,425
Shares issued | 34,425 | 34,425 | 34,425 | 34,425
Shares outstanding | 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 | 88,893,548 | 88,893,548 | 88,893,548 | 88,893,548
Shares issued | 88,893,548 | 88,893,548 | 88,893,548 | 88,893,548
Shares outstanding | 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 | 1 | 1 | 1 | 1
Shares issued | 1 | 1 | 1 | 1
Shares outstanding | 1 | 1 | 1 | 1

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