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Share-based compensation - Share-based Compensation Expense (Details) - USD ($) | 3 Months Ended
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Mar. 31, 2026 | Mar. 31, 2025
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expenses | $ (116,394) | $ 76,306
Selling and distribution expenses |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expenses | 17,568 | 29,754
General and administrative expenses |  |
Share-Based Payment Arrangement, Expensed and Capitalized, Amount [Line Items] |  |
Total share-based compensation expenses | $ (133,962) | $ 46,552

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