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Line of Credit Facility, Accordion Feature, Increase Limit

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Number of Lawsuits

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Number of Bonding Facilities for Bank Guarantees

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Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Fair value of the amount outstanding under the credit facility.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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The minimum amount the entity agreed to spend under the long-term purchase commitment.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Commitments and Contingencies - Additional Information (Details)	1 Months Ended		12 Months Ended
	Nov. 30, 2020 lawsuits	Feb. 28, 2014 people	Dec. 31, 2021 USD ($) facility	Dec. 31, 2021 GBP (£) facility	Dec. 31, 2020 USD ($) facility	Dec. 31, 2020 GBP (£) facility	Dec. 31, 2019 USD ($)	Dec. 31, 2021 GBP (£)	Oct. 31, 2021 USD ($)	May 31, 2021 USD ($)	Apr. 30, 2021 USD ($)	Dec. 31, 2020 GBP (£)
Loss Contingencies [Line Items]
Capital expenditure commitments			$ 1,500,000		$ 1,100,000		$ 1,000,000
Long-term debt, gross			$ 60,800,000
Number of bonding facilities \| facility			3	3	2	2
Borrowing capacity			$ 4,000,000
Credit facility, amount drawn			$ 0
Individuals with minor injuries \| people		3
Number of lawsuits \| lawsuits	3
GBP
Loss Contingencies [Line Items]
Number of bonding facilities \| facility			2	2	1	1
U.S. dollars
Loss Contingencies [Line Items]
Number of bonding facilities \| facility			1	1	1	1
Revolving credit facility
Loss Contingencies [Line Items]
Debt maximum borrowing capacity									$ 100,000,000	$ 100,000,000	$ 150,000,000
Uncommitted accordion facility			$ 50,000,000		$ 50,000,000
Long-term debt, gross			10,800,000		4,100,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity					1,300,000							£ 1,000,000
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			100,000,000		150,000,000
Bonding Facility For Bank Guarantees \| GBP
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			900,000		6,100,000			£ 600,000				£ 4,500,000
Amount drawn/utilized			200,000	£ 100,000	1,400,000	£ 1,000,000
Bonding Facility For Bank Guarantees \| U.S. dollars
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			1,500,000		1,500,000
Amount drawn/utilized			$ 900,000		$ 800,000