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Summary of Significant Accounting Policies - Narrative (Details) $ in Thousands, € in Millions, £ in Millions | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2022 USD ($) region | Sep. 30, 2022 EUR (€) region | Sep. 30, 2022 GBP (£) region | Sep. 30, 2021 USD ($) | Dec. 31, 2021 USD ($) | Jan. 01, 2021 USD ($)
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Number of geographic regions | region |  |  | 2 | 2 | 2 |  |  |
Operating lease right-of-use assets | $ 2,338 |  | $ 2,338 |  |  |  | $ 3,696 |
Operating lease liabilities - current | 1,831 |  | 1,831 |  |  |  | $ 2,235 |
Foreign exchange gains | $ 1,096 | $ 3,364 | $ 4,387 |  |  | $ 2,171 |  |
Accounting Standards Update 2016-02 |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Operating lease right-of-use assets |  |  |  |  |  |  |  | $ 1,000
Operating lease liabilities - current |  |  |  |  |  |  |  | $ 1,000
United Kingdom Research and Development Tax Credit Regime, Small or Medium-Sized Enterprises (SME) |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cash rebate percent (in percent) |  |  | 33.35% | 33.35% | 33.35% |  |  |
Total aid claimable | € |  |  |  | € 7.5 |  |  |  |
United Kingdom Research and Development Tax Credit Regime |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |
Cash rebate percent (in percent) |  |  | 21.67% | 21.67% | 21.67% |  |  |
Annual offset amount | £ |  |  |  |  | £ 5.0 |  |  |
Percentage of taxable profits (in percent) |  |  | 50.00% | 50.00% | 50.00% |  |  |

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