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Long-term investments - Equity method investments (Details)
$ / shares in Units, ¥ in Thousands, kr in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Sep. 01, 2021
CNY (¥)
Jul. 26, 2021
CNY (¥)
shares
Jul. 26, 2021
USD ($)
shares
Apr. 28, 2021
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
SEK (kr)
Apr. 30, 2022
item
Mar. 31, 2022
CNY (¥)
Feb. 28, 2022
CNY (¥)
Jan. 31, 2022
CNY (¥)
Jul. 31, 2021
CNY (¥)
Jul. 31, 2021
SEK (kr)
May 31, 2021
CNY (¥)
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2021
USD ($)
Aug. 31, 2021
Jul. 26, 2021
$ / shares
Long-term investments                                      
Cash contribution to acquire equity method investment                           ¥ 79,442 $ 11,518 ¥ 1,345,637      
Excess of consideration over the carrying amount of the equity investment                               689,670      
Gain as a result of deconsolidation                   ¥ 71,974       ¥ 71,974 $ 10,435 ¥ 10,579      
SiEngine Technology Co., Ltd                                      
Long-term investments                                      
Cash contribution to acquire equity method investment   ¥ 68,967 $ 10,600                                
Value of shares issued to acquire equity method investment   620,703 $ 95,800                                
Carrying amount of the Company's controlling shareholder   0                                  
Excess of consideration over the carrying amount of the equity investment   ¥ 689,670                                  
SiEngine Technology Co., Ltd | Series B Redeemable Convertible Preferred                                      
Long-term investments                                      
Number of shares issued to acquire equity method investment | shares   9,882,082 9,882,082                                
Issuance price | $ / shares                                     $ 9.70
Geely Group                                      
Long-term investments                                      
Equity interest (as a percent)       50.00%                              
Cash contribution to acquire equity method investment       ¥ 200,000                              
Suzhou Chenling Investment LLP                                      
Long-term investments                                      
Equity interest (as a percent)                         9.416%            
Cash contribution to acquire equity method investment                         ¥ 200,000            
Volvo Cars                                      
Long-term investments                                      
Equity interest (as a percent)         60.00%           40.00% 40.00%   60.00%          
Cash contribution to acquire equity method investment         ¥ 17,478 kr 25,620         ¥ 269,813 kr 360,000              
SiEngine Technology Co., Ltd                                      
Long-term investments                                      
Equity interest (as a percent)   34.61%                 34.61% 34.61%              
Cash contribution to acquire equity method investment | $                                 $ 10,649    
Hubei Dongjun Automotive Electronics Technology Co., Ltd.                                      
Long-term investments                                      
Equity interest (as a percent) 49.00%                                 51.00%  
Equity interest sold (as a percent) 2.00%                                    
Cash consideration for sale of equity method investment ¥ 1,000                                    
Remeasured equity interest at fair value 24,500                                    
Gain as a result of deconsolidation ¥ 10,579                                    
Suzhou Photon-Matrix                                      
Long-term investments                                      
Equity interest sold (as a percent)                   3.45%                  
Number of equity method investments spun off | item             3                        
Cash consideration for sale of equity method investment                   ¥ 10,000                  
Remeasured equity interest at fair value         ¥ 64,000         ¥ 64,000       ¥ 64,000          
Gain as a result of deconsolidation                           ¥ 71,974          
Suzhou Photon-Matrix | Minimum                                      
Long-term investments                                      
Equity interest (as a percent)                   49.17%                  
Suzhou Photon-Matrix | Maximum                                      
Long-term investments                                      
Equity interest (as a percent)                   50.92%                  
ECARX HK                                      
Long-term investments                                      
Equity interest (as a percent)         40.00%                 40.00%          
Cash contribution to acquire equity method investment         ¥ 11,652 kr 17,080                          
Anhui Xinzhi                                      
Long-term investments                                      
Cash consideration for sale of equity method investment               ¥ 28,500 ¥ 28,500