| Prepayments and other current assets, net Prepayments and other current assets, net consisted of the following: | | | | | | | | | | | | | As of December 31, | | 2024 | | 2025 | | US$ | | US$ | | Prepayments to suppliers | 22,849 | | | 13,222 | | | Receivables from partial sale of equity interest in SiEngine (refer to Note 9) | 17,947 | | | — | | | Contract cost assets | 9,525 | | | 2,724 | | | Deductible VAT | 4,083 | | | 5,221 | | | Others | 7,127 | | | 15,216 | | | Prepayments and other current assets, net | 61,531 | | | 36,383 | |
A reversal of provision of US$185 was recorded for prepayments and other current assets for the year ended December 31, 2023. No provision was made for prepayments and other current assets as of December 31, 2024 and 2025, respectively
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