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STOCKHOLDERS' DEFICIT - Preferred Stock (Details) - $ / shares
Mar. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
STOCKHOLDERS' DEFICIT      
Preferred stock, shares authorized 40,000,000 82,352,000  
Preferred stock, par value (in dollars per share) $ 0.0001 $ 0.0001  
Preferred stock, shares issued 0 0  
Preferred stock, shares outstanding 0 0  
CONCORD ACQUISITION CORP III      
STOCKHOLDERS' DEFICIT      
Preferred stock, shares authorized   1,000,000 1,000,000
Preferred stock, par value (in dollars per share)   $ 0.0001 $ 0.0001
Preferred stock, shares issued   0 0
Preferred stock, shares outstanding   0 0