Financial instruments - fair values and risk management - Contractual maturities of non-derivative financial liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Contractual maturities of non-derivative financial liabilities
Carrying amounts	$ 31,708	$ 28,507
Contractual cash flows	31,704	28,515
3 months or less
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	30,830	26,886
Between 3 - 12 months
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	437	453
Between 1 - 5 years
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	437	1,176
Lease liabilities
Contractual maturities of non-derivative financial liabilities
Carrying amounts	1,187	1,934
Contractual cash flows	1,183	1,942
Lease liabilities \| 3 months or less
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	309	313
Lease liabilities \| Between 3 - 12 months
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	437	453
Lease liabilities \| Between 1 - 5 years
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	437	1,176
Trade and other payables
Contractual maturities of non-derivative financial liabilities
Carrying amounts	30,521	26,573
Contractual cash flows	30,521	26,573
Trade and other payables \| 3 months or less
Contractual maturities of non-derivative financial liabilities
Contractual cash flows	$ 30,521	$ 26,573

- Definition

The amount of liabilities that are: (a) a contractual obligation: (i) to deliver cash or another financial asset to another entity; or (ii) to exchange financial assets or financial liabilities with another entity under conditions that are potentially unfavourable to the entity; or (b) a contract that will, or may be, settled in the entity’s own equity instruments and is: (i) a non-derivative for which the entity is, or may be, obliged to deliver a variable number of the entity’s own equity instruments; or (ii) a derivative that will, or may be, settled other than by the exchange of a fixed amount of cash or another financial asset for a fixed number of the entity’s own equity instruments. For this purpose, rights, options or warrants to acquire a fixed number of the entity’s own equity instruments for a fixed amount of any currency are equity instruments if the entity offers the rights, options or warrants pro rata to all of its existing owners of the same class of its own non-derivative equity instruments. Also, for those purposes the entity’s own equity instruments do not include puttable financial instruments that are classified as equity instruments in accordance with paragraphs 16A-16B of IAS 32, instruments that impose on the entity an obligation to deliver to another party a pro rata share of the net assets of the entity only on liquidation and are classified as equity instruments in accordance with paragraphs 16C-16D of IAS 32, or instruments that are contracts for the future receipt or delivery of the entity’s own equity instruments. As an exception, an instrument that meets the definition of a financial liability is classified as an equity instrument if it has all the features and meets the conditions in paragraphs 16A-16B or paragraphs 16C-16D of IAS 32. [Refer: Financial instruments, class [member]; Financial assets; Derivatives [member]]

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