v3.25.2
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2025
Aug. 13, 2025
Document and Entity Information    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 000-33123  
Entity Registrant Name China Automotive Systems, Inc.  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 33-0885775  
Entity Address, Address Line One No. 1 Henglong Road, Yu Qiao Development Zone  
Entity Address, Address Line Two Shashi District  
Entity Address, Address Line Three Jing Zhou City  
Entity Address, City or Town Hubei Province  
Entity Address, Country CN  
City Area Code 86  
Local Phone Number 716- 412- 7901  
Title of 12(b) Security Common Stock, $0.0001 par value  
Trading Symbol CAAS  
Security Exchange Name NASDAQ  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Non-accelerated Filer  
Entity Small Business true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   30,170,702
Entity Central Index Key 0001157762  
Current Fiscal Year End Date --12-31  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Amendment Flag false