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Commitments and Contingencies - Additional Information (Details) £ in Millions | 1 Months Ended | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Feb. 28, 2014 people | Sep. 27, 2020 USD ($) | Sep. 27, 2020 USD ($) facility | Sep. 27, 2020 GBP (£) facility | Dec. 31, 2019 USD ($) | Dec. 31, 2019 GBP (£) | Sep. 27, 2020 GBP (£) | Dec. 31, 2019 GBP (£)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Amount drawn/utilized |  | $ 16,500,000 |  |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  | 2 | 2 |  |  |  |
Borrowing capacity |  | 4,000,000.0 | $ 4,000,000.0 |  | $ 0 |  |  |
Credit facility, amount drawn |  | 0 | 0 |  |  |  |  |
Capital expenditure commitments |  |  | 800,000 |  |  |  |  |
Number of people with minor injuries | people | 3 |  |  |  |  |  |  |
Committed Banking Facilities |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | 150,000,000.0 | 150,000,000.0 |  | 150,000,000.0 |  |  |
Amount drawn/utilized |  |  | 0 |  | 17,500,000 |  |  |
Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | 5,700,000 | 5,700,000 |  | 5,900,000 |  | £ 4.5 |
Amount drawn/utilized |  |  | 1,500,000 | £ 1.2 | 2,300,000 | £ 1.6 |  |
Letter of Credit |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Debt maximum borrowing capacity |  | $ 1,300,000 | $ 1,300,000 |  | 1,300,000 |  | £ 1.0 | £ 1.0
U.K. pounds |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  | 1 | 1 |  |  |  |
United States of America, Dollars |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Amount drawn/utilized |  |  | $ 800,000 |  |  |  |  |
Number of bonding facilities for bank guarantees | facility |  |  | 1 | 1 |  |  |  |
United States of America, Dollars | Bonding Facility For Bank Guarantees |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Amount drawn/utilized |  |  | $ 1,500,000 |  | $ 400,000 |  |  |

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