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Commitments and Contingencies - Additional Information (Details) £ in Millions | 12 Months Ended |  |  |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2017 GBP (£) | Dec. 31, 2016 USD ($) | Mar. 10, 2019 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Capital expenditure commitments | $ 2,500,000 |  | $ 600,000 |  | $ 3,600,000 |  |  |
Long-term debt, gross | 78,500,000 |  |  |  |  |  |  |
Committed Banking Facilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity | 150,000,000 |  |  |  |  |  |  |
Amount drawn/utilized | 0 |  | 1,300,000 |  |  |  |  |
Other - Bank overdraft |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Long-term debt, gross | 3,500,000 |  | 4,200,000 |  |  |  |  |
Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity | 3,800,000 |  | 4,100,000 |  |  |  | £ 3.0 |
Amount drawn/utilized | 1,900,000 | £ 1.5 | 1,400,000 | £ 1.0 |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity | 8,900,000 |  | 9,500,000 |  |  |  | £ 7.0 | £ 7.0
Amount drawn/utilized | $ 0 |  | $ 0 |  |  |  |  |
Subsequent Event |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Payment committed related to aborted acquisition (up to) |  |  |  |  |  | $ 3,500,000 |  |

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