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Document and Entity Information
Dec. 03, 2025
Document And Entity Information [Line Items]  
Amendment Flag false
Entity Central Index Key 0001789029
Document Type 8-K
Document Period End Date Dec. 03, 2025
Entity Registrant Name Aeva Technologies, Inc.
Entity Incorporation State Country Code DE
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
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company false
Common Stock Par Value 0.0001 Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Common stock, par value $0.0001 per share
Trading Symbol AEVA
Security Exchange Name NASDAQ
Warrants To Purchase Common Stock [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Warrants to purchase common stock
Trading Symbol AEVAW
Security Exchange Name NASDAQ