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TAXATION (Tables) | 12 Months Ended
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Dec. 31, 2025
TAXATION |
Schedule of loss before income taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Non – PRC |  | 20,824 | ​ | (36,488) | ​ | 19,592 | ​ | 2,802
PRC |  | (576,418) | ​ | (633,092) | ​ | (392,948) | ​ | (56,191)
​ |  | (555,594) | ​ | (669,580) | ​ | (373,356) | ​ | (53,389)
Schedule of current and deferred components of the income tax expense (benefit) | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
​ | ​ | 2023 | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Current tax expense (benefit) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
- PRC | ​ | (8,179) | ​ | (1,127) | ​ | 13,875 | ​ | 1,984
- Non PRC | ​ | 1,165 | ​ | (1,142) | ​ | 197 | ​ | 28
Total current tax expense (benefit) | ​ | (7,014) | ​ | (2,269) | ​ | 14,072 | ​ | 2,012
Deferred tax benefit | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
- PRC | ​ | (16,135) | ​ | (15,851) | ​ | (6,335) | ​ | (906)
- Non PRC | ​ | (1,424) | ​ | 615 | ​ | (1,673) | ​ | (239)
Total deferred tax expense (benefit) | ​ | (17,559) | ​ | (15,236) | ​ | (8,008) | ​ | (1,145)
Total provision for (benefit from) income taxes | ​ | (24,573) | ​ | (17,505) | ​ | 6,064 | ​ | 867
Schedule of reconciliation of the differences between the statutory tax rate and the effective tax rate for EIT | Upon adoption of ASU 2023-09, Improvements to Income Tax Disclosures, as described in Note 2, Summary of Significant Accounting Policies, the reconciliation of taxes at the PRC statutory rate to our provision for (benefit from) income taxes for the year ended December 31, 2025 was as follows (in thousands, except for percentages):
​ | ​ | ​
​ | ​ ​ ​ | Amount
​ | ​ | RMB
PRC statutory tax rate |  | (98,237)
Foreign tax effects |  | 8,663
Non-taxable income |  | (6,825)
Non-deductible expenses |  | 4,066
Statutory expense |  | 39,018
Interest and penalty |  | 163
Deferred tax expense |  | 1,996
Changes of valuation allowance |  | 57,023
Withholding tax |  | 197
Effective tax rate |  | 6,064
​ The reconciliation of taxes at the PRC statutory rate to our provision for (benefit from) income taxes for the years ended December 31, 2023 and 2024 in accordance with the guidance prior to the adoption of ASU 2023-09 was as follows (in thousands): ​
​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2023 | ​ | 2024
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB
Loss before income taxes |  | (555,594) | ​ | (669,580)
Income tax computed at the tax rate of 25% |  | (138,899) | ​ | (167,396)
Effect of different tax rates in different jurisdictions |  | (5,178) | ​ | 12,338
Non-deductible expenses |  | 18,287 | ​ | 14,108
Non-taxable income |  | (6,447) | ​ | (1,027)
Statutory income (expense) | ​ | 51,631 | ​ | (14,740)
Interest and penalty | ​ | (6,121) | ​ | (2,473)
Deferred tax expense | ​ | 3,357 | ​ | 11,929
Changes of valuation allowance |  | 58,030 | ​ | 128,716
Withholding tax |  | 767 | ​ | 1,040
​ |  | (24,573) | ​ | (17,505)
Schedule of components of deferred taxes | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | As at December 31,
​ | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Deferred tax asset |  | ​ |  | ​ |  | ​
Net operating loss* |  | 540,787 | ​ | 591,962 | ​ | 84,649
Foreign exchange loss | ​ | 2,140 | ​ | 3,813 | ​ | 545
Depreciation and amortization |  | 16,212 | ​ | 18,837 | ​ | 2,694
Property, plant and equipment impairment |  | 1,914 | ​ | 2,253 | ​ | 322
Deposits for non-current assets |  | 17,725 | ​ | 17,725 | ​ | 2,535
Allowance for doubtful accounts |  | 51,153 | ​ | 49,297 | ​ | 7,049
Lease liabilities |  | 45,536 | ​ | 41,640 | ​ | 5,954
Other long-term assets |  | 94,563 | ​ | 97,812 | ​ | 13,987
Equity investment |  | 7,105 | ​ | 7,130 | ​ | 1,020
Others |  | 10,506 | ​ | 7,890 | ​ | 1,128
Total deferred tax assets |  | 787,641 | ​ | 838,359 | ​ | 119,883
less: Valuation allowance** |  | (751,370) | ​ | (807,650) | ​ | (115,492)
Net deferred tax assets |  | 36,271 | ​ | 30,709 | ​ | 4,391
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities |  | ​ |  | ​ |  | ​
Equity investment |  | (999) | ​ | (41) | ​ | (6)
Property, plant and equipment |  | (16,110) | ​ | (16,747) | ​ | (2,395)
Disposal of Beijing Century Friendship |  | (3,126) | ​ | (3,126) | ​ | (447)
Intangible assets |  | (65,998) | ​ | (58,054) | ​ | (8,302)
Right-of-use assets |  | (32,497) | ​ | (29,165) | ​ | (4,171)
Others |  | (411) | ​ | 1,422 | ​ | 205
​ | ​ | ​ | ​ | ​ | ​ | ​
Total deferred tax liabilities |  | (119,141) | ​ | (105,711) | ​ | (15,116)
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax assets, net |  | — | ​ | — | ​ | —
​ | ​ | ​ | ​ | ​ | ​ | ​
Deferred tax liabilities, net |  | (82,870) | ​ | (75,002) | ​ | (10,725)
| * | As of December 31, 2025, the Group had net operating losses from several of its PRC and oversea entities of RMB2,367,847 (US$338,598), which can be carried forward to offset future taxable profit. As per filed tax returns, the net operating loss from PRC entities will expire between 2026 to 2029. For the net operating loss from overseas entities, there is no limitation of expiration according to the statute of Hong Kong and US.
| ** | The Group records a valuation allowance on its deferred tax assets that is sufficient to reduce the deferred tax assets to an amount that is more likely than not to be realized. Future reversal of the valuation allowance will be recognized either when the benefit is realized or when it has been determined that it is more likely than not that the benefit in future earnings will be realized.
Schedule of movement of valuation allowance | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Year Ended December 31,
​ | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Balance at the beginning of year |  | (623,044) |  | (751,370) |  | (107,444)
Change of valuation allowance in the current year |  | (128,326) |  | (56,280) |  | (8,048)
Balance at the end of year |  | (751,370) |  | (807,650) |  | (115,492)
Schedule of reconciliation of the beginning and ending amount of unrecognized tax benefits excluding the penalty and interest | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | For the Years Ended December 31,
​ | ​ | 2024 | ​ | 2025 | ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
Balance at the beginning of year |  | 63,899 |  | 67,799 |  | 9,695
Changes based on tax positions related to the current year |  | — |  | — |  | —
Additions related to prior year tax position |  | 5,469 |  | 8,956 |  | 1,281
Decreases related to prior year tax position |  | (610) |  | (90) |  | (13)
Decrease related to disposal of CMSI |  | (1,011) |  | 680 |  | 97
Decreases relating to expiration of applicable statute of limitation |  | (680) |  | (5) |  | (1)
Foreign currency translation |  | 732 |  | (1,125) |  | (161)
Balance at the end of year | ​ | 67,799 | ​ | 76,215 | ​ | 10,898

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