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Cover
Apr. 04, 2024
Entity Addresses [Line Items]  
Document Type 8-K
Amendment Flag false
Document Period End Date Apr. 04, 2024
Entity File Number 001-41013
Entity Registrant Name GCT Semiconductor Holding, Inc.
Entity Central Index Key 0001851961
Entity Tax Identification Number 86-2171699
Entity Incorporation, State or Country Code DE
Entity Address, Address Line One 2290 North 1st Street
Entity Address, Address Line Two Suite 201
Entity Address, City or Town San Jose
Entity Address, State or Province CA
Entity Address, Postal Zip Code 95131
City Area Code 408
Local Phone Number 434-6040
Written Communications false
Soliciting Material false
Pre-commencement Tender Offer false
Pre-commencement Issuer Tender Offer false
Entity Emerging Growth Company true
Elected Not To Use the Extended Transition Period false
Entity Information, Former Legal or Registered Name Concord Acquisition Corp III
Common Stock [Member]  
Entity Addresses [Line Items]  
Title of 12(b) Security Common Stock, par value $0.0001 per share
Trading Symbol GCTS
Security Exchange Name NYSE
Warrant [Member]  
Entity Addresses [Line Items]  
Title of 12(b) Security Warrants, each whole warrant exercisable for one share of Common Stock for $11.50 per share
Trading Symbol GCTSW
Security Exchange Name NYSE
Former Address [Member]  
Entity Addresses [Line Items]  
Entity Address, Address Line One 477 Madison Avenue
Entity Address, Address Line Two 22nd Floor
Entity Address, City or Town New York
Entity Address, State or Province NY
Entity Address, Postal Zip Code 10022