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TAXATION (Tables) | 12 Months Ended
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Dec. 31, 2025
TAXATION |
Schedule of income (loss) before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Mainland China |  | (50,136) |  | (42,551) |  | (67,851) |  | (9,703)
Other jurisdictions |  | 62,712 |  | (31,091) |  | (340,955) |  | (48,755)
Total profit income (loss) before tax |  | 12,576 |  | (73,642) |  | (408,806) |  | (58,458)
Schedule of composition of income tax expense | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the years ended December 31,
​ | ​ ​ ​ | 2023 | ​ ​ ​ | 2024 | ​ ​ ​ | 2025 | ​ ​ ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Current income tax expense |  | ​ |  | ​ | ​ | ​ | ​ | ​
PRC |  | — |  | — |  | 110 |  | 16
Deferred income tax expense (benefit) |  | — |  | — |  | — |  | —
​ |  | — | ​ | — | ​ | 110 | ​ | 16
Schedule of reconciliation between statutory EIT rate and Group's effective tax rate | ​
​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | For the year ended | ​ ​ ​ | For the year ended | ​ ​ ​
​ | ​ | December 31, | ​ | December 31, | ​
​ | ​ ​ ​ | 2023 | ​ ​ ​ | 2024 | ​ ​ ​
​ | ​ | ​ | ​ | ​ | ​
PRC statutory EIT rate |  | 25 | % | 25 | %
Effect of different tax rates in other jurisdictions |  | 0 | % | (270) | %
Change in future tax rate (upon expiration of preferential rate) |  | (1) | % | 0 | %
Change of prior year deferred tax assets |  | (37) | % | 16 | %
Change of valuation allowance |  | 194 | % | 174 | %
Income not subject to tax and non-deductible expenses, net |  | 16 | % | (2) | %
Effect of expired net operating loss |  | (197) | % | 57 | %
PRC withholding tax | ​ | 0 | % | 0 | %
Effective EIT rate |  | 0 | % | 0 | %
​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the year ended | ​
​ | ​ | December 31, | ​
​ | ​ | 2025 | ​
​ | ​ | RMB | ​ | USD | ​ | ​ | ​
​ | ​ | (in thousands) | ​
PRC statutory EIT rate | ​ ​ ​ | (99,071) | ​ | (14,167) | ​ | 24 | %
Effect of different tax rates in other jurisdictions |  | — | ​ | — | ​ | — | %
Change in future tax rate (upon expiration of preferential rate) |  | (6,458) | ​ | (923) | ​ | 2 | %
Change of prior year deferred tax assets |  | 66,281 | ​ | 9,478 | ​ | (16) | %
Change of valuation allowance |  | 45,994 | ​ | 6,577 | ​ | (11) | %
Income not subject to tax and non-deductible expenses, net |  | 1,166 | ​ | 167 | ​ | (1) | %
Effect of expired net operating loss |  | (7,802) | ​ | (1,116) | ​ | 2 | %
PRC withholding tax |  | — | ​ | — | ​ | — | %
Effective EIT rate |  | 110 | ​ | 16 | ​ | 0 | %
Schedule of significant components of deferred tax assets and liabilities | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | December 31, | ​ | December 31, | ​ | December 31,
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025 | ​ ​ ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Temporary differences related to expenses and accruals |  | 530 |  | 460 |  | 66
Temporary differences related to impairment on advances to suppliers |  | 306 |  | 306 |  | 44
Temporary differences related to provision for credit losses |  | 600 |  | 601 |  | 86
Other |  | — |  | 23 |  | 3
Temporary differences related to depreciation, amortization, and impairment of equipment and intangible assets |  | (3,392) |  | (3,317) |  | (474)
Startup expenses and advertising fees |  | 33 |  | 14 |  | 2
Temporary differences related to equity investments |  | 7,747 |  | 14,041 |  | 2,008
Temporary differences related to provision for prepayment for equipment |  | — |  | — |  | —
Tax loss carry forwards |  | 142,365 |  | 97,392 |  | 13,926
Total deferred tax assets |  | 148,189 |  | 109,520 |  | 15,661
Less: Valuation allowance |  | (148,189) |  | (109,520) |  | (15,661)
Total deferred tax assets |  | — |  | — |  | —
Schedule of movement of valuation allowance on deferred tax assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | For the year ended | ​ ​ ​ | For the year ended | ​ ​ ​ | For the year ended
​ | ​ | December 31, | ​ | December 31, | ​ | December 31,
​ | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Beginning balance |  | 84,879 | ​ | 148,189 | ​ | 21,191
Increase (decrease) in valuation allowance |  | 63,310 | ​ | (38,669) | ​ | (5,530)
Ending balance |  | 148,189 | ​ | 109,520 | ​ | 15,661

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