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Document and Entity Information
Jul. 27, 2021
Document And Entity Information [Line Items]  
Entity Registrant Name QuantumScape Corp
Amendment Flag false
Entity Central Index Key 0001811414
Document Type 8-K
Document Period End Date Jul. 27, 2021
Entity Incorporation State Country Code DE
Entity File Number 001-39345
Entity Tax Identification Number 85-0796578
Entity Address, Address Line One 1730 Technology Drive
Entity Address, City or Town San Jose
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95110
City Area Code (408)
Local Phone Number 452-2000
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Entity Ex Transition Period false
Class A Common Stock Par Value 0.0001 Per Share [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Class A common stock, par value $0.0001 per share
Trading Symbol QS
Security Exchange Name NYSE
Redeemable Warrants Each Whole Warrant Exercisable Forone Share Of Class A Common Stock At An Exercise Price Of 11.50 [Member]  
Document And Entity Information [Line Items]  
Security 12b Title Redeemable warrants, each whole warrant exercisable forone share of Class A common stock at an exercise price of$11.50
Trading Symbol QS.WS
Security Exchange Name NYSE