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Cover - shares
 9 Months Ended
Sep. 30, 2021
Jul. 31, 2021
Cover [Abstract]    
Entity Registrant Name AEMETIS, INC.  
Entity Central Index Key 0000738214  
Document Type 10-Q  
Amendment Flag false  
Current Fiscal Year End Date --12-31  
Entity Small Business true  
Entity Shell Company false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Document Period End Date Sep. 30, 2021  
Entity Filer Category Non-accelerated Filer  
Document Fiscal Period Focus Q3  
Document Fiscal Year Focus 2021  
Entity Common Stock Shares Outstanding   33,250,807
Document Quarterly Report true  
Document Transition Report false  
Entity Interactive Data Current Yes  
Entity File Number 001-36475  
Entity Incorporation State Country Code DE  
Entity Tax Identification Number 26-1407544  
Entity Address Address Line 1 20400 Stevens Creek Blvd  
Entity Address Address Line 2 Suite 700  
Entity Address City Or Town Cupertino  
Entity Address State Or Province CA  
Entity Address Postal Zip Code 95014  
City Area Code 408  
Local Phone Number 213-0940  
Security 12b Title Common Stock, $0.001 par value  
Trading Symbol AMTX  
Security Exchange Name NASDAQ