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Convertible Notes
 12 Months Ended
Dec. 31, 2022
Debt Disclosure [Abstract]  
Convertible Notes Convertible Notes
On April 17, 2020, upon the Series B convertible preferred share financing, which constituted a Qualified Financing, the outstanding principal of the convertible notes of $18.4 million (£15.0 million) automatically converted into 1,723,263 Series B convertible preferred shares, and there was no outstanding balance as of December 31, 2020.
The Company elected the fair value option to account for the 2019 Convertible Notes. The Company recorded the 2019 Convertible Notes at fair value and subsequently remeasured them to fair value at each reporting date. Changes in fair value were recognized as a component of other income (expense), net in the consolidated statements of operations and comprehensive loss. The Company recognized losses in the consolidated statements of operations and comprehensive loss of $1.8 million as change in fair value of the convertible notes during the year ended December 31, 2020. There are no convertible notes outstanding in the years ended December 31, 2022 or 2021.