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Common Stock - Common Stock Reserved for Issuance (Details) - shares
shares in Thousands
Sep. 30, 2024
Dec. 31, 2023
Common Stock    
Shares of authorized but unissued common stock 52,509 5,902
Options issued and outstanding    
Common Stock    
Shares of authorized but unissued common stock 550 668
RSUs Outstanding    
Common Stock    
Shares of authorized but unissued common stock 611 392
Shares available for future grant from 2024 plan    
Common Stock    
Shares of authorized but unissued common stock 3,762  
Shares available for future grant from 2024 ESPP    
Common Stock    
Shares of authorized but unissued common stock 600  
Shares available for future grant from 2011 plan    
Common Stock    
Shares of authorized but unissued common stock   113
Common stock warrants    
Common Stock    
Shares of authorized but unissued common stock 26,273 2,894
Legacy GCT Earnout Shares    
Common Stock    
Shares of authorized but unissued common stock 20,000  
Convertible promissory notes    
Common Stock    
Shares of authorized but unissued common stock 713 1,835