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PREPAYMENTS AND OTHER CURRENT ASSETS, NET (Tables)
12 Months Ended
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