v3.26.1
Document and Entity Information - shares
 6 Months Ended
Jun. 30, 2026
Jul. 30, 2026
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Quarterly Report true  
Document Transition Report false  
Document Period End Date Jun. 30, 2026  
Document Fiscal Year Focus 2026  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Trading Symbol AEVA  
Entity Registrant Name AEVA TECHNOLOGIES, INC.  
Entity Central Index Key 0001789029  
Entity Filer Category Large Accelerated Filer  
Entity Small Business false  
Entity Emerging Growth Company false  
Entity Current Reporting Status Yes  
Entity Shell Company false  
Entity File Number 001-39204  
Entity Tax Identification Number 84-3080757  
Entity Address, Address Line One 555 Ellis Street  
Entity Address, City or Town Mountain View  
Entity Address, State or Province CA  
Entity Address, Postal Zip Code 94043  
City Area Code 650  
Local Phone Number 481-7070  
Entity Incorporation, State or Country Code DE  
Entity Interactive Data Current Yes  
Title of 12(b) Security Common stock, $0.0001 par value per share  
Security Exchange Name NASDAQ  
Entity Common Stock, Shares Outstanding   69,705,758