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Shareholders’ Equity - Ordinary Shares (Details)	Jun. 26, 2018 USD ($)	Mar. 31, 2021 $ / shares shares	Mar. 31, 2021 £ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2020 £ / shares shares
Class of Stock
Authorized grant, life	5 years
Ordinary shares
Class of Stock
Maximum nominal shares authorized for grant | $	$ 8,400
Shares issued		70,515,354	70,515,354	52,346,231	52,346,231
Stock par value (usd/gbp per share) | $ / shares		$ 0.000042		$ 0.000042
Deferred Shares
Class of Stock
Shares issued		34,425	34,425	34,425	34,425
Stock par value (usd/gbp per share) | £ / shares			£ 0.00001		£ 0.00001
Deferred B Shares
Class of Stock
Shares issued		88,893,548	88,893,548	88,893,548	88,893,548
Stock par value (usd/gbp per share) | £ / shares			£ 0.00099		£ 0.00099
Deferred C Shares
Class of Stock
Shares issued		1	1	1	1
Stock par value (usd/gbp per share) | £ / shares			£ 0.000008		£ 0.000008

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Maximum Nominal Amount Of Shares Authorized For Grant

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Face amount or stated value per share of common stock.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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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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