Reverse Recapitalization - Legacy GCT and Sponsor Earn out Shares - Additional Information (Details) - Legacy G C T - USD ($)		1 Months Ended
	Mar. 26, 2024	Jul. 31, 2024
Earnout shares
Reverse Recapitalization
Number of shares issued	20,000,000
Threshold trading days calculated for issuing shares	20 days
Consecutive threshold trading days calculated for issuing shares	30 days
Fair value of shares issued	$ 108,800,000
Earnout shares \| VWAP of the Company's common stock equals or exceeds $12.50 per share
Reverse Recapitalization
Number of shares issued	6,666,666
Threshold VWAP of stock to trigger earn out shares	$ 12.5
Earnout shares \| VWAP of the Company's common stock equals or exceeds $15.00 per share
Reverse Recapitalization
Number of shares issued	6,666,667
Threshold VWAP of stock to trigger earn out shares	$ 15
Earnout shares \| VWAP of the Company's common stock equals or exceeds $17.50 per share
Reverse Recapitalization
Number of shares issued	6,666,667
Threshold VWAP of stock to trigger earn out shares	$ 17.5
Sponsor Earnout Shares
Reverse Recapitalization
Number of shares issued	1,920,375
Threshold trading days calculated for issuing shares	20 days
Consecutive threshold trading days calculated for issuing shares	30 days
Fair value of shares issued	$ 10,400,000
Market based vesting common stock reduced shares		570,796
Remaining outstanding common stock shares		1,349,579
Adjustments to stockholders' deficit		$ 0
Sponsor Earnout Shares \| VWAP of the Company's common stock equals or exceeds $12.50 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 12.5
Sponsor Earnout Shares \| VWAP of the Company's common stock equals or exceeds $15.00 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 15
Sponsor Earnout Shares \| VWAP of the Company's common stock equals or exceeds $17.50 per share
Reverse Recapitalization
Number of shares issued	640,125
Threshold VWAP of stock to trigger earn out shares	$ 17.5

GCT Semiconductor Holding, Inc. 10-K