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Number of Bonding Facilities for Bank Guarantees

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Future cash outflow to pay for purchases of fixed assets that have occurred.

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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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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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Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations.

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Commitments and Contingencies - Additional Information (Details) £ in Millions	1 Months Ended	3 Months Ended	6 Months Ended		12 Months Ended
	Feb. 28, 2014 people	Jun. 28, 2020 USD ($)	Jun. 28, 2020 USD ($) facility	Jun. 28, 2020 GBP (£) facility	Dec. 31, 2019 USD ($)	Jun. 28, 2020 GBP (£)	Dec. 31, 2019 GBP (£)
Loss Contingencies [Line Items]
Amount drawn/utilized		$ 18,400,000
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			700,000
Number of people with minor injuries \| people	3
Elektron segment
Loss Contingencies [Line Items]
Inventory commitments		1,000,000.0	1,000,000.0
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			16,300,000		17,500,000
Bonding Facility For Bank Guarantees
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		5,600,000	5,600,000		5,900,000	£ 4.5
Amount drawn/utilized			2,000,000.0	£ 1.6	2,300,000
Letter of Credit
Loss Contingencies [Line Items]
Debt maximum borrowing capacity		$ 1,200,000	$ 1,200,000		$ 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]
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			$ 400,000