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Reverse Recapitalization - Business Combination (Details)
$ / shares in Units, $ in Millions
Mar. 26, 2024
USD ($)
$ / shares
Dec. 31, 2023
$ / shares
Reverse Recapitalization [Line Items]    
Conversion price | $ / shares   $ 3.50
Concord III    
Reverse Recapitalization [Line Items]    
Transaction costs incurred in acquisition | $ $ 13.1  
Conversion price | $ / shares   $ 1.00
Concord III | PIPE financing    
Reverse Recapitalization [Line Items]    
Transaction costs incurred in acquisition | $ 0.9  
Legacy G C T    
Reverse Recapitalization [Line Items]    
Transaction costs incurred in acquisition | $ $ 8.9  
Legacy G C T | Concord III    
Reverse Recapitalization [Line Items]    
Percentage of ownership acquired 100.00%  
Net proceeds received on acquisition | $ $ 17.1  
Share price in business acquisition | $ / shares $ 10.00  
Stock exchange ratio 0.1868  
Legacy G C T | Concord III | Convertible debt    
Reverse Recapitalization [Line Items]    
Conversion price | $ / shares $ 6.67