Income Taxes - Summary of Operating Loss Carryforwards and Research Tax Credits (Details) - USD ($) $ in Thousands |
Dec. 31, 2022 |
Dec. 31, 2021 |
|---|---|---|
| UK | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards and research tax credits | $ 225,662 | $ 82,156 |
| US | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards and research tax credits | 48,523 | 34,059 |
| France | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards and research tax credits | 25,474 | 19,710 |
| Germany | ||
| Operating Loss Carryforwards [Line Items] | ||
| Operating loss carryforwards and research tax credits | $ 0 | $ 11,062 |