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Long-term investments (Tables) | 12 Months Ended
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Dec. 31, 2025
Long-term investments |
Schedule of long-term investments | ​
​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, | ​ ​ ​ | December 31,
​ | ​ | 2024 | ​ | 2025
Equity investments: |  | ​ |  | ​
Equity method investments (i) |  | 1,275,287 |  | 805,296
Equity securities without readily determinable fair value (ii) |  | 504,282 |  | 362,687
Equity securities with readily determinable fair value (iii) |  | 33,865 |  | 324,074
Equity securities using fair value option (iv) |  | 1,103,150 |  | —
Debt investments: |  | ​ |  | ​
Available-for-sale debt securities (iv) |  | 173,918 |  | 979,071
Held-to-maturity debt securities – time deposit |  | 12,086 |  | 9,390
Retained asset-backed securities | ​ | 23,419 | ​ | —
Total |  | 3,126,007 |  | 2,480,518
Schedule of equity securities without readily determinable fair value | ​
​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31,
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025
Equity securities without readily determinable fair value: |  | ​ |  | ​
Initial cost |  | 417,497 |  | 300,147
Net cumulative fair value adjustments |  | 86,785 |  | 62,540
Carrying value |  | 504,282 |  | 362,687
Schedule of available-for-sale debt securities | ​
​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, | ​ ​ ​ | December 31,
​ | ​ | 2024 | ​ | 2025
Available-for-sale debt securities: |  | ​ |  | ​
Initial cost |  | 173,918 |  | 979,071
Net cumulative fair value adjustments |  | — |  | —
Carrying value |  | 173,918 |  | 979,071

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- Definition Tabular disclosure of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 9 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-9 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 3: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 4: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 5: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 6: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 7: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 8: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-2 Reference 9: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 10: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 11: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 Reference 12: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147481800/320-10-50-3 + Details
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