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Parent only financial information - Condensed statements of comprehensive loss (Details)
¥ in Thousands, $ in Thousands
 12 Months Ended
Dec. 31, 2022
CNY (¥)
Dec. 31, 2022
USD ($)
Dec. 31, 2021
CNY (¥)
Dec. 31, 2020
CNY (¥)
Condensed statements of comprehensive loss        
Research and development expenses ¥ 1,210,871 $ 175,560 ¥ 1,209,385 ¥ 706,018
General and administrative expenses 1,180,218 171,116 506,873 215,008
Interest income (including related parties: nil, RMB717 and RMB9,069 for the years ended December 31, 2020, 2021 and 2022, respectively) 12,444 1,804 11,783 28,480
Interest expenses (including related parties: RMB872, RMB212 and RMB18,808 for the years ended December 31, 2020, 2021 and 2022, respectively) 51,136 7,414 131,666 59,128
Foreign currency exchange gains (losses), net (18,216) (2,641) 18,315 54,842
Change in fair value of an equity security (16,843) (2,442)    
Income (loss) from equity method investments (137,391) (19,920) (2,519) 148
Loss before income taxes (1,519,638) (220,327) (1,181,985) (439,776)
Income tax expenses 21,571 3,128 3,447 228
Net loss attributable to ECARX Holdings Inc. (1,539,301) $ (223,179) (1,179,615) (439,659)
Parent Company [Member]        
Condensed statements of comprehensive loss        
General and administrative expenses (26,005)   (17,660)  
Interest income (including related parties: nil, RMB717 and RMB9,069 for the years ended December 31, 2020, 2021 and 2022, respectively) 6,565   885 431
Interest expenses (including related parties: RMB872, RMB212 and RMB18,808 for the years ended December 31, 2020, 2021 and 2022, respectively) (3,132)   (514)  
Foreign currency exchange gains (losses), net (14,459)   12,478 55,213
Change in fair value of an equity security (16,843)      
Income (loss) from equity method investments (1,486,141)   (1,176,110) (495,303)
Loss before income taxes (1,540,015)   (1,180,921) (439,659)
Net loss attributable to ECARX Holdings Inc. ¥ (1,540,015)   ¥ (1,180,921) ¥ (439,659)