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PREPAYMENTS AND OTHER CURRENT ASSETS, NET (Tables) | 12 Months Ended
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Dec. 31, 2025
PREPAYMENTS AND OTHER CURRENT ASSETS, NET |
Schedule of prepayments and other current assets | ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ ​ ​ | December 31, | ​ ​ ​ | December 31, | ​ ​ ​ | December 31,
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025 | ​ ​ ​ | 2025
​ | ​ ​ ​ | RMB | ​ ​ ​ | RMB | ​ ​ ​ | US$
​ | ​ | (in thousands) | ​ | (Note 3)
Employee advances |  | 620 | ​ | 3,710 | ​ | 530
Input VAT recoverable | ​ | 3,767 | ​ | 5,179 | ​ | 741
Prepayments and deposits |  | 18,327 | ​ | 4,798 | ​ | 686
Other receivables, net of allowance for credit losses of RMB 39,577 (in thousands) and RMB 40,773 (in thousands), as of December 31, 2024 and 2025, respectively |  | 3,333 | ​ | 5,856 | ​ | 837
Prepayments and other current assets-third parties | ​ | 26,047 | ​ | 19,543 | ​ | 2,794
Prepayments and other current assets-related party |  | — | ​ | 515 | ​ | 74

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