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Shareholders’ Equity - Ordinary Shares (Details)	Mar. 31, 2020 USD ($) $ / shares shares	Mar. 31, 2020 £ / shares	Dec. 31, 2019 £ / shares shares	Dec. 31, 2019 $ / shares shares	Jun. 26, 2018 USD ($)
Ordinary shares
Class of Stock
Maximum nominal shares authorized for grant | $	$ 8,400				$ 8,400
Shares issued (shares)	52,247,932		44,983,006	44,983,006
Stock par value (usd per share) | $ / shares	$ 0.000042			$ 0.000042
Deferred Shares
Class of Stock
Shares issued (shares)	34,425		34,425	34,425
Stock par value (usd per share) | £ / shares		£ 0.00001	£ 0.00001
Deferred B Shares
Class of Stock
Shares issued (shares)	88,893,548		88,893,548	88,893,548
Stock par value (usd per share) | £ / shares		0.00099	£ 0.00099
Deferred C Shares
Class of Stock
Shares issued (shares)	1		1	1
Stock par value (usd 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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