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Description of business and organization - Merger and recapitalization (Details)
$ / shares in Units, ¥ in Thousands, $ in Thousands
 1 Months Ended 12 Months Ended
Dec. 20, 2022
CNY (¥)
seat
shares
Dec. 20, 2022
USD ($)
seat
shares
Mar. 05, 2020
CNY (¥)
investment
Nov. 30, 2023
CNY (¥)
Apr. 30, 2022
company
investment
Dec. 31, 2024
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2024
USD ($)
$ / shares
Dec. 31, 2023
CNY (¥)
Dec. 31, 2023
$ / shares
Dec. 20, 2022
USD ($)
$ / shares
shares
Business Acquisition [Line Items]                      
Preferred shares issued (in shares) 90,724,289                   90,724,289
Preferred shares outstanding (in shares) 90,724,289                   90,724,289
Number of ordinary shares for each preferred share 1 1                  
Ordinary shares, par value per share (in USD per share) | $ / shares                     $ 0.000005
Recapitalization factor per share | $ / shares                     1.19295710
Recapitalization factor, pre-money equity value | $   $ 3,400,000                  
Recapitalization factor, per share multiplier | $ / shares                     $ 10.00
Number of board members to elect | seat 2 2                  
Number of equity method investments transferred | investment         3            
Number of investment and consulting companies | company         2            
Amounts due from related parties           ¥ 35,367   $ 4,845 ¥ 74,122    
Amount of loan provided | ¥       ¥ 50,000              
Excess of the assets derecognized over the amounts due from the VIE | ¥             ¥ 61,921        
VIE's                      
Business Acquisition [Line Items]                      
Working Capital | ¥     ¥ 20,000                
Number of equity method investments spun off | investment     3                
Variable Interest Entity, Qualitative or Quantitative Information, Ownership Percentage           100.00%          
Merger                      
Business Acquisition [Line Items]                      
Aggregate proceeds ¥ 270,539 $ 38,870                  
Cash proceeds 43,724 6,282                  
Transaction costs 293,168                   $ 42,122
Excess cost over proceeds 22,629                   3,252
Geely Investment | Merger                      
Business Acquisition [Line Items]                      
Value of shares received 139,200 $ 20,000                  
Luminar Technologies, Inc | Merger                      
Business Acquisition [Line Items]                      
Transaction costs ¥ 87,615                   $ 12,588
Hubei ECARX                      
Business Acquisition [Line Items]                      
Amounts due from related parties | ¥           ¥ 205,954          
Amount of loan provided | ¥           ¥ 252,287          
Effective annual interest rate (in percent)           5.00%          
Excess of the assets derecognized over the amounts due from the VIE | ¥           ¥ 61,921          
Class B Ordinary Shares                      
Business Acquisition [Line Items]                      
Number of authorized unissued shares designated into this class 958,958,360 958,958,360                  
Number of ordinary shares for each ordinary share 1 1                  
Ordinary shares, par value per share (in USD per share) | $ / shares               $ 0.000005   $ 0.000005  
Class B Ordinary Shares | Existing Shareholders                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 48,960,916 48,960,916                  
Common Shares, Class To Be Determined                      
Business Acquisition [Line Items]                      
Number of authorized unissued shares designated into this class 1,000,000,000 1,000,000,000                  
Class A Ordinary Shares                      
Business Acquisition [Line Items]                      
Number of authorized unissued shares designated into this class 7,766,956,008 7,766,956,008                  
Number of ordinary shares for each ordinary share 1 1                  
Ordinary shares, par value per share (in USD per share) | $ / shares               $ 0.000005   $ 0.000005  
Number of shares issued (in shares) 282,564,117 282,564,117                  
Class A Ordinary Shares | Holders of COVA Shares                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 5,870,357 5,870,357                  
Class A Ordinary Shares | Merger Sponsor                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 5,250,000 5,250,000                  
Class A Ordinary Shares | Geely Investment                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 2,000,000 2,000,000                  
Class A Ordinary Shares | Luminar Technologies, Inc                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 1,500,000 1,500,000                  
Class A Ordinary Shares | Lotus Technology Inc                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 1,052,632 1,052,632                  
Class A Ordinary Shares | Existing Ordinary Shareholders                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 193,216,446 193,216,446                  
Class A Ordinary Shares | Existing Preferred Shareholders                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 84,795,039 84,795,039                  
Class A Ordinary Shares | Mr. Shufu Li                      
Business Acquisition [Line Items]                      
Number of authorized unissued shares designated into this class 20,520,820 20,520,820                  
Warrants | Holders Of COVA Warrants                      
Business Acquisition [Line Items]                      
Number of shares issued (in shares) 23,871,971 23,871,971