Employee benefits - Amounts recognized in the balance sheet (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Disclosure of net defined benefit liability (asset) [line items]
Net liability - beginning of period	$ (1,635)	$ (6,839)	$ (7,987)
Recognized in profit or loss	140	2,594	(621)
Recognized in other comprehensive income	(116)	942	1,453
Foreign currency translation differences	(57)	184	316
Reclassification equity-settled LTIPs	0	1,484	0
Net liability - end of period	(1,669)	(1,635)	(6,839)
Liabilities	(1,669)	(1,635)	(6,839)
Assets	0	0	0
NET LIABILITY	(1,669)	(1,635)	(6,839)
Present value of funded obligation
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	(5,330)	(4,595)	(4,865)
Fair value of plan assets	5,173	4,434	4,224
Surplus (deficit) in plan	(157)	(161)	(641)
Present value of unfunded obligations
Disclosure of net defined benefit liability (asset) [line items]
Present value of funded obligation	$ (1,512)	$ (1,474)	$ (6,198)

The present value, without deducting any plan assets, of expected future payments required to settle the obligation resulting from employee service in the current and prior periods. [Refer: Plan assets, at fair value]

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with members defined in one or many axes of the table.

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No definition available.

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The decrease (increase) in a net defined benefit liability (asset) resulting from the remeasurement of that net defined benefit liability (asset). [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes in foreign exchange rates. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
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- Definition

The increase (decrease) in the net defined benefit liability (asset) resulting from changes that the entity does not separately disclose in the same statement or note. [Refer: Net defined benefit liability (asset)]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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- Definition

The amount of deficit or surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The amount of non-current provisions for employee benefits. [Refer: Provisions for employee benefits]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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The fair value of defined benefit plan assets. Plan assets comprise assets held by a long-term employee benefit fund and qualifying insurance policies. [Refer: At fair value [member]]

+ References

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The amount of post-employment benefit expense included in profit or loss relating to defined benefit plans. [Refer: Profit (loss); Defined benefit plans [member]] [Contrast: Increase (decrease) in net defined benefit liability (asset) resulting from expense (income) in profit or loss]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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The amount of surplus in a defined benefit plan, adjusted for any effect of limiting a net defined benefit asset to the asset ceiling. [Refer: Defined benefit plans [member]]

+ References

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The fair value of any plan assets, less the present value of the defined benefit obligation. [Refer: Plan assets [member]]

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