Document And Entity Information
Oct. 03, 2022
Document Information [Line Items]  
Document Type 8-K
Amendment Flag false
Current Fiscal Year End Date --12-31
Document Period End Date Oct. 03, 2022
Entity Registrant Name Quanergy Systems, Inc.
Entity Central Index Key 0001794621
Entity Emerging Growth Company true
Securities Act File Number 001-39222
Entity Incorporation, State or Country Code DE
Entity Tax Identification Number 88-0535845
Entity Address, Address Line One 433 LAKESIDE DRIVE
Entity Address, City or Town SUNNYVALE
Entity Address, State or Province CA
Entity Address, Postal Zip Code 94085
City Area Code 408
Local Phone Number 245-9500
Entity Information, Former Legal or Registered Name Not Applicable
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Ex Transition Period false
Common Stock 0.0001 Par Value Per Share 2 [Member]  
Document Information [Line Items]  
Title of 12(b) Security Common Stock, $0.0001 par value per share
Trading Symbol QNGY
Security Exchange Name NYSE
Warrants Each Whole Warrant Exercisable for One Share of Common Stock at an Exercise Price of 11.50 Per Share 1 [Member]  
Document Information [Line Items]  
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Common Stock at an exercise price of $11.50 per share
Trading Symbol QNGY WS
Security Exchange Name NYSE