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EMPLOYEE BENEFIT PLANS | 12 Months Ended
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Dec. 31, 2025
EMPLOYEE BENEFIT PLANS |
EMPLOYEE BENEFIT PLANS | 18.EMPLOYEE BENEFIT PLANS a. Defined Benefit Plans The Group maintains a German pension plan after the completion of the acquisition of DH. As of December 31, 2024 and 2025, accumulated benefit obligation net of plan assets recognized in the consolidated balance sheets consist of the following: ​
​ | ​ | ​ | ​ | ​
​ | ​ | As of December 31,
​ | ​ ​ ​ | 2024 | ​ ​ ​ | 2025
Salary and welfare payables |  | 9 | ​ | 10
Retirement benefit obligation |  | 111 | ​ | 109
Liability in the balance sheet |  | 120 | ​ | 119
​ b. Defined Contribution Plans Full time employees of the Group in the PRC participate in a government-mandated defined contribution plan pursuant to which certain pension benefits, medical care, unemployment insurance, employee housing fund and other welfare benefits are provided to employees. PRC labor regulations require the Group to accrue for these benefits based on a certain percentage of the employees’ salaries. The total contribution for such employee benefits were RMB699, RMB835 and RMB990 for the years ended December 31, 2023, 2024 and 2025, respectively. The Group has no ongoing obligation to its employees subsequent to its contribution to the PRC plan. Furthermore, the Group pays contribution to governmental and private pension insurance organizations based on legal regulations in some countries out of PRC. The contributions are recognized as expense and amount RMB90, RMB108 and RMB111 for the years ended December 31, 2023, 2024 and 2025.

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