Commitments and Contingencies	12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Capital commitments At December 31, 2022, the Company had capital expenditure commitments of $1.4 million (2021: $1.5 million and 2020: $1.1 million) for the acquisition of new plant and equipment. Committed banking facilities At December 31, 2022, the Company had committed banking facilities of $100.0 million with an additional $50.0 million of uncommitted facilities through an accordion provision. Of these committed facilities, $31.9 million was drawn at December 31, 2022. The Company had a separate (uncommitted) facility for letters of credit, which at December 31, 2022, was $2.2 million. $1.8 million of this was utilized at December 31, 2022. The Company also had a separate (uncommitted) bonding facility for bank guarantees; denominated in GBP sterling totaling £0.5 million ($0.6 million) and £0.1 million ($0.2 million) was utilized at December 31, 2022. The Company has a separate overdraft facility of $4.0 million, of which none was drawn at December 31, 2022. Additionally, the Company has various uncommitted transitional banking and foreign exchange lines available for day-to-day operational purposes. At December 31, 2021 the Company had committed banking facilities of $100.0 million with an additional $50.0 million of uncommitted facilities through an accordion provision. Of the committed facilities, $10.8 million was drawn at December 31, 2021. The Company had a separate (uncommitted) facility for letters of credit, which at December 31, 2021, was $1.5 million. $0.9 million of this was utilized at December 31, 2021. The Company also had a separate (uncommitted) bonding facility for bank guarantees; denominated in GBP sterling totaling £0.6 million ($0.9 million) and £0.1 million ($0.2 million) was utilized at December 31, 2021. The Company has a separate overdraft facility of $4.0 million, of which none was drawn at December 31, 2021. Additionally, the Company has various uncommitted transitional banking and foreign exchange lines available for day-to-day operational purposes. Contingencies In November 2018, an alleged explosion occurred at a third-party waste disposal and treatment site in Grand View, Idaho, reportedly causing property damage, personal injury, and one fatality. We contracted with a service company for removal and disposal of certain waste resulting from the magnesium powder manufacturing operations at the Reade facility in Manchester, New Jersey. We believe this service company, in turn, contracted with the third-party disposal company, at whose facility the explosion occurred, for treatment and disposal of the waste. In November 2020, we were named as a defendant in three lawsuits in relation to the incident – one by the third-party disposal company, one by the estate of the decedent, and one by an injured employee of the third-party disposal company. We believe that we are not liable for the incident, have asserted such, and continue to fully defend the Company against these lawsuits. Therefore, we do not currently expect any eventual outcome in these matters to have a material impact on the Company's financial position or results of operations.

Commitments and Contingencies

12 Months Ended

Dec. 31, 2022

Commitments and Contingencies Disclosure [Abstract]

Capital commitments

At December 31, 2022, the Company had capital expenditure commitments of $1.4 million (2021: $1.5 million and 2020: $1.1 million) for the acquisition of new plant and equipment.

Committed banking facilities

At December 31, 2022, the Company had committed banking facilities of $100.0 million with an additional $50.0 million of uncommitted facilities through an accordion provision. Of these committed facilities, $31.9 million was drawn at December 31, 2022.

The Company had a separate (uncommitted) facility for letters of credit, which at December 31, 2022, was $2.2 million. $1.8 million of this was utilized at December 31, 2022.

The Company also had a separate (uncommitted) bonding facility for bank guarantees; denominated in GBP sterling totaling £0.5 million ($0.6 million) and £0.1 million ($0.2 million) was utilized at December 31, 2022.

The Company has a separate overdraft facility of $4.0 million, of which none was drawn at December 31, 2022.

Additionally, the Company has various uncommitted transitional banking and foreign exchange lines available for day-to-day operational purposes.

At December 31, 2021 the Company had committed banking facilities of $100.0 million with an additional $50.0 million of uncommitted facilities through an accordion provision. Of the committed facilities, $10.8 million was drawn at December 31, 2021.

The Company had a separate (uncommitted) facility for letters of credit, which at December 31, 2021, was $1.5 million. $0.9 million of this was utilized at December 31, 2021.

The Company also had a separate (uncommitted) bonding facility for bank guarantees; denominated in GBP sterling totaling £0.6 million ($0.9 million) and £0.1 million ($0.2 million) was utilized at December 31, 2021.

The Company has a separate overdraft facility of $4.0 million, of which none was drawn at December 31, 2021.

Additionally, the Company has various uncommitted transitional banking and foreign exchange lines available for day-to-day operational purposes.

Contingencies

In November 2018, an alleged explosion occurred at a third-party waste disposal and treatment site in Grand View, Idaho, reportedly causing property damage, personal injury, and one fatality. We contracted with a service company for removal and disposal of certain waste resulting from the magnesium powder manufacturing operations at the Reade facility in Manchester, New Jersey. We believe this service company, in turn, contracted with the third-party disposal company, at whose facility the explosion occurred, for treatment and disposal of the waste. In November 2020, we were named as a defendant in three lawsuits in relation to the incident – one by the third-party disposal company, one by the estate of the decedent, and one by an injured employee of the third-party disposal company. We believe that we are not liable for the incident, have asserted such, and continue to fully defend the Company against these lawsuits. Therefore, we do not currently expect any eventual outcome in these matters to have a material impact on the Company's financial position or results of operations.