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CRYPTOCURRENCIES - Summary of intangible assets (Details) ¥ in Thousands, $ in Thousands	Dec. 31, 2025 CNY (¥)	Dec. 31, 2025 USD ($)	Dec. 31, 2024 CNY (¥)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 CNY (¥)	Dec. 31, 2023 USD ($)
Intercompany Foreign Currency Balance [Line Items]
Total	¥ 252,206	$ 36,065	¥ 206,130		¥ 107,961
Cryptocurrencies, restricted-current	238,533	34,110	193,938
Balance of Cryptocurrencies	13,673	1,955	12,192
Bitcoins
Intercompany Foreign Currency Balance [Line Items]
Total	238,886	34,160	196,680
Cryptocurrencies, restricted-current					9,100	$ 1,300
Cryptocurrencies, restrict-Non current					¥ 2,400	$ 300
Tether
Intercompany Foreign Currency Balance [Line Items]
Total	11,713	1,675	2,154
USD Coin
Intercompany Foreign Currency Balance [Line Items]
Total	¥ 1,607	$ 230
Filecoin
Intercompany Foreign Currency Balance [Line Items]
Total			7,296
Cryptocurrencies, restricted-current			¥ 6,700	$ 1,000

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+ References

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- Definition

Fair value of crypto asset. Excludes crypto asset held for platform user.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476163/350-60-45-1

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+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 350
-SubTopic 60
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147476162/350-60-50-1

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