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Commitments and Contingencies - Additional Information (Details) £ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Dec. 31, 2021 GBP (£) | Dec. 31, 2020 USD ($) | Dec. 31, 2022 GBP (£) | Dec. 31, 2021 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |
Capital expenditure commitments | $ 1,400,000 | $ 1,500,000 |  | $ 1,100,000 |  |
Long-term debt outstanding | 81,900,000 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt maximum borrowing capacity | 100,000,000 |  |  |  |  |
Uncommitted accordion facility | 50,000,000 | 50,000,000 |  |  |  |
Long-term debt outstanding | 31,900,000 | 10,800,000 |  |  |  |
Letter of Credit |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt maximum borrowing capacity | 2,200,000 | 1,500,000 |  |  |  |
Long-term debt outstanding | 1,800,000 | 900,000 |  |  |  |
Bank overdrafts |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt maximum borrowing capacity | 4,000,000 | 4,000,000 |  |  |  |
Credit facility, amount drawn | 0 | 0 |  |  |  |
Committed Banking Facilities |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt maximum borrowing capacity | 100,000,000 | 100,000,000 |  |  |  |
Bonding Facility For Bank Guarantees |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Debt maximum borrowing capacity | 600,000 | 900,000 |  |  | £ 0.5 | £ 0.6
Long-term debt outstanding | $ 200,000 |  |  |  | £ 0.1 |
Amount drawn/utilized |  | $ 200,000 | £ 0.1 |  |  |

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