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Financial instruments - Forward exchange contracts (Details) € in Millions	12 Months Ended
	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2021 EUR (€)	Dec. 31, 2020 EUR (€)
Disclosure of financial assets [line items]
Realized losses (gains) on foreign exchange hedges reclassified to revenue	$ (1,064,000)	$ 1,804,000
Forward exchange contract
Disclosure of financial assets [line items]
Hedge ineffectiveness	0
Forward exchange contract | Cash flow hedges
Disclosure of financial assets [line items]
Notional amount | €			€ 25.8	€ 12.2
Forward exchange contract | Cash flow hedges | other current assets
Disclosure of financial assets [line items]
Assets, fair value	$ 700,000
Forward exchange contract | Cash flow hedges | other current liabilities
Disclosure of financial assets [line items]
Liabilities, fair value		$ 600,000

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The fair value of financial assets. [Refer: At fair value [member]; Financial assets]

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The gains (losses) recognised in other comprehensive income on exchange differences on the translation of financial statements of foreign operations, before tax, before reclassification adjustments. [Refer: Other comprehensive income]

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