v3.26.1
COMMITMENTS AND CONTINGENCIES - Royalty commitments (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
COMMITMENTS AND CONTINGENCIES        
Base payment for royalty $ 3,000      
Royalty expense | ¥   ¥ 38,644 ¥ 24,542 ¥ 35,288
2030        
COMMITMENTS AND CONTINGENCIES        
Base payment for royalty $ 300      
Net revenues of rotational scanning product from US$0 to US$425,000        
COMMITMENTS AND CONTINGENCIES        
Percentage of royalty on net revenue 4.00% 4.00%    
Net revenues of rotational scanning product from US$0 to US$425,000 | Minimum        
COMMITMENTS AND CONTINGENCIES        
Net revenues of rotational scanning product $ 0      
Net revenues of rotational scanning product from US$0 to US$425,000 | Maximum        
COMMITMENTS AND CONTINGENCIES        
Net revenues of rotational scanning product $ 425,000      
Net revenues of rotational scanning product from US$425,000 to US$2,925,000        
COMMITMENTS AND CONTINGENCIES        
Percentage of royalty on net revenue 3.00% 3.00%    
Net revenues of rotational scanning product from US$425,000 to US$2,925,000 | Minimum        
COMMITMENTS AND CONTINGENCIES        
Net revenues of rotational scanning product $ 425,000      
Net revenues of rotational scanning product from US$425,000 to US$2,925,000 | Maximum        
COMMITMENTS AND CONTINGENCIES        
Net revenues of rotational scanning product $ 2,925,000      
Net revenues of rotational scanning product from US$2,925,000 to above        
COMMITMENTS AND CONTINGENCIES        
Percentage of royalty on net revenue 2.00% 2.00%    
Net revenues of rotational scanning product $ 2,925,000