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Summary of significant accounting policies - Foreign Currency Translation and Transaction (Details) | Mar. 31, 2026 ¥ / $ | Mar. 31, 2026 $ / $ | Mar. 31, 2026 € / $ | Mar. 31, 2026 ₨ / $ | Dec. 31, 2025 ¥ / $ | Dec. 31, 2025 $ / $ | Dec. 31, 2025 € / $ | Dec. 31, 2025 ₨ / $
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Accounting Policies [Abstract] |  |  |  |  |  |  |  |
Exchange rate on the balance sheet date | 6.9139 | 1.3690 | 0.8692 | 93.8539 | 6.9835 | 1.3690 | 0.8500 | 89.8354

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- Definition Foreign exchange rate used to translate amounts denominated in functional currency to reporting currency. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481674/830-30-50-2 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 830 -SubTopic 30 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479424/830-30-S99-1 + Details
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