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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
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