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Summary of significant accounting policies, Revenue recognition - Contract balances (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Summary of significant accounting policies [Abstract]
Revenue recognized	$ 1,100
Net contract (liabilities) assets [Abstract]
Unbilled receivables, current	106	$ 145
Unbilled receivables, non-current	32	120
Customer pre-payments	(164)	(155)
Deferred revenue, current	(1,107)	(1,079)
Deferred revenue, non-current	(246)	(209)
Net contract (liabilities) assets	$ (1,379)	$ (1,178)

X

- Definition

Amount, after allowance for credit loss, of right (asset) to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time and the amount of obligation (liability) to transfer good or service to customer for which consideration has been received or is receivable, classified as current.

+ References

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X

- Definition

Amount of obligation to transfer good or service to customer related to customer prepayments for which consideration has been received or is receivable, classified as current.

+ References

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Amount of revenue recognized related to obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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- Definition

Amount, after allowance for credit loss, of right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 606
-SubTopic 10
-Name Accounting Standards Codification
-Section 45
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

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-Topic 606
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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-URI https://asc.fasb.org/1943274/2147479837/606-10-45-3

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-URI https://asc.fasb.org/1943274/2147479837/606-10-45-1

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