v3.26.1
BORROWINGS - Long-term bank borrowings (Details)
¥ in Thousands, SFr in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2025
CNY (¥)
Sep. 30, 2024
CNY (¥)
Oct. 31, 2023
CNY (¥)
Nov. 30, 2022
CNY (¥)
Dec. 31, 2025
CNY (¥)
Dec. 31, 2025
USD ($)
Dec. 31, 2025
CHF (SFr)
Dec. 31, 2024
CNY (¥)
Dec. 31, 2023
CNY (¥)
Dec. 31, 2024
CHF (SFr)
Dec. 31, 2023
CHF (SFr)
Debt Instrument [Line Items]                      
Repayment of long-term borrowings         ¥ 0 $ 0   ¥ 20,157 ¥ 0    
Long-term bank borrowings, current portion         116,457     116,453      
Long-term borrowings         278,727     ¥ 269,438      
Swiss Company                      
Debt Instrument [Line Items]                      
long-term borrowings                 ¥ 2,516   SFr 299
Long-Term Debt                      
Debt Instrument [Line Items]                      
Unused bank facility         143,687            
Shanghai Hesai Long Term Facility                      
Debt Instrument [Line Items]                      
Term of borrowings (in years)       2 years              
Line of credit facility, maximum borrowing capacity       ¥ 700,000              
Annual interest rate       100.00%              
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]       us-gaap:PrimeRateMember              
Credit facility agreement         ¥ 362,033            
Interest rate         2.30% 2.30% 2.30% 2.65%      
Amount drew drawn               ¥ 18,570      
Outstanding balance         ¥ 208,871     298,387      
Repaid outstanding balance         ¥ 89,516     ¥ 89,516      
Zhejiang Hertz One Year Long Term Facility                      
Debt Instrument [Line Items]                      
Term of borrowings (in years)     1 year                
Line of credit facility, maximum borrowing capacity     ¥ 110,000                
Annual interest rate     60.00%                
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]     us-gaap:PrimeRateMember                
Interest rate         2.85% 2.85% 2.85% 2.83%      
Amount drew drawn         ¥ 0     ¥ 70,069      
Outstanding balance         26,941     53,874      
Amount drew drawn         26,933     21,542      
Long-term bank borrowings, current portion         26,941     26,937      
Zhejiang Hertz First Five-Year Long-Term Facility                      
Debt Instrument [Line Items]                      
Term of borrowings (in years)   5 years                  
Line of credit facility, maximum borrowing capacity   ¥ 150,000                  
Fixed annual interest   2.50%                  
Amount drew drawn         118,363     31,637      
Outstanding balance         150,000     31,637      
Zhejiang Hertz Second Five-Year Long-Term Facility                      
Debt Instrument [Line Items]                      
Term of borrowings (in years) 5 years                    
Line of credit facility, maximum borrowing capacity ¥ 70,000                    
Fixed annual interest 2.51%                    
Amount drew drawn         9,372            
Outstanding balance         ¥ 9,372            
Long Term Debt Assumed In Acquisition                      
Debt Instrument [Line Items]                      
Repayment of long-term borrowings | SFr             SFr 50        
Long-term borrowings               ¥ 1,993   SFr 249