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Commitments and Contingencies (Details)	1 Months Ended		9 Months Ended		12 Months Ended
	Nov. 30, 2020 lawsuits	Feb. 28, 2014 people	Sep. 26, 2021 USD ($) facility	Sep. 26, 2021 GBP (£) facility	Dec. 31, 2020 USD ($)	Dec. 31, 2020 GBP (£)	Sep. 26, 2021 GBP (£)	Jun. 30, 2021 USD ($)	Mar. 31, 2021 USD ($)	Dec. 31, 2020 GBP (£)
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			2	2
Borrowing capacity			$ 4,000,000
Credit facility, amount drawn			$ 0		$ 0
Number of people with minor injuries | people		3
Number of lawsuits | lawsuits	3
United Kingdom, Pounds
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			1	1
United States of America, Dollars
Loss Contingencies [Line Items]
Number of bonding facilities for bank guarantees | facility			1	1
Committed Banking Facilities
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			$ 100,000,000		150,000,000
Bonding Facility For Bank Guarantees | United Kingdom, Pounds
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			6,200,000		6,100,000		£ 4,500,000
Amount drawn/utilized			800,000	£ 600,000	1,400,000	£ 1,000,000
Bonding Facility For Bank Guarantees | United States of America, Dollars
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			1,500,000		1,500,000
Amount drawn/utilized			900,000		800,000
Revolving credit facility
Loss Contingencies [Line Items]
Debt maximum borrowing capacity								$ 100,000,000	$ 150,000,000
Long-term debt, gross			0		4,100,000
Borrowing capacity			100,000,000		145,900,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity			$ 1,400,000		$ 1,300,000		£ 1,000,000			£ 1,000,000

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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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