Summary of significant accounting policies - Additional Information (Details) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Restricted cash
Restricted cash	$ 0	$ 0
Trade receivables, net
Allowance for doubtful accounts	243	0
Other receivables and Prepayments
Allowance for uncollectible other receivables and prepayments	10	8
Loan receivables, net
Allowance for loan receivables	5,491	2,023
Contract Balances
Revenue recognized from beginning contract liability balance	$ 87	$ 0

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The valuation allowance as of the balance sheet date to reduce the gross amount of receivables to estimated net realizable value, which would be presented in parentheses on the face of the balance sheet.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Amount of allowance for credit loss on accounts receivable, classified as current.

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

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Amount excluding accrued interest, of allowance for credit loss on financing receivable, classified as current.

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Amount of cash restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits.

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