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Commitments and Contingencies - Additional Information (Details) £ in Millions | 1 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 28, 2014 people | Dec. 31, 2019 USD ($) facility | Dec. 31, 2019 GBP (£) facility | Dec. 31, 2018 USD ($) | Dec. 31, 2018 GBP (£) | Dec. 31, 2017 USD ($) | Dec. 31, 2019 GBP (£) | Dec. 31, 2018 GBP (£) | Jul. 31, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Capital expenditure commitments |  | $ 1,000,000.0 |  | $ 2,500,000 |  | $ 600,000 |  |  |
Long-term debt, gross |  | $ 92,500,000 |  |  |  |  |  |  |
Number of bonding facilities | facility |  | 2 | 2 |  |  |  |  |  |
Individuals with minor injuries | people | 3 |  |  |  |  |  |  |  |
Committed Banking Facilities |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | $ 150,000,000.0 |  | 150,000,000 |  |  |  |  |
Amount drawn/utilized |  | 0 |  | 0 |  |  |  |  |
Other - Bank overdraft |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Long-term debt, gross |  | 0 |  | 3,500,000 |  |  |  |  |
Letter of Credit |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | 1,300,000 |  | 8,900,000 |  |  | £ 1.0 | £ 7.0 |
Amount drawn/utilized |  | 0 |  | 0 |  |  |  |  |
Revolving credit facility |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  |  |  |  |  |  |  |  | $ 150,000,000
Long-term debt, gross |  | $ 17,500,000 |  | 0 |  |  |  |  |
GBP |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of bonding facilities | facility |  | 1 | 1 |  |  |  |  |  |
GBP | Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | $ 5,900,000 |  | 3,800,000 |  |  | £ 4.5 | £ 3.0 |
Amount drawn/utilized |  | $ 2,300,000 | £ 1.5 | $ 1,900,000 | £ 1.5 |  |  |  |
U.S. dollars |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Number of bonding facilities | facility |  | 1 | 1 |  |  |  |  |  |
U.S. dollars | Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |  |
Amount drawn/utilized |  | $ 400,000 |  |  |  |  |  |  |

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