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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Details) - USD ($)
 1 Months Ended 3 Months Ended 12 Months Ended
Mar. 26, 2024
Nov. 16, 2023
Nov. 07, 2023
May 04, 2023
Aug. 16, 2022
Nov. 30, 2023
Apr. 30, 2023
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Unrecognized tax benefits               $ 3,100,000   $ 3,083,000 $ 3,203,000 $ 3,106,000
Unrecognized tax benefits accrued for interest and penalties                   $ 522,000 $ 449,000  
Anti-dilutive securities attributable to warrants (in shares)               32,267,000 3,689,000 24,706,930 18,405,485  
CONCORD ACQUISITION CORP III                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Expense reimbursement receivable                   $ 296,441 $ 0  
Accretion of the discounts                   0 $ 320,030  
Federal depository insurance coverage                   $ 250,000    
Holders of number of shares who exercised their right to redeem shares 3,766,000                 30,558,639    
Redemption price per share     $ 10.70 $ 10.42                
Aggregate redemption amount     $ 1,100,000 $ 317,000,000                
Number of warrants issued                   26,650,000    
Aggregate amount                   $ 6,900,000    
Stock-based compensation expense                   $ 0    
Statutory tax rate                   21.00% 21.00%  
Unrecognized tax benefits                   $ 0 $ 0  
Unrecognized tax benefits accrued for interest and penalties                     0  
Inflation Reduction Act of 2022, federal excise tax rate         1.00%              
Excise tax payable attributable to redemption of common stock                   3,184,272 0  
Aggregate of shares             999,665          
Cash equivalents                   0 0  
Reimbursement of expenses                   413,529 0  
Offset reported expenses                   709,970 $ 0  
CONCORD ACQUISITION CORP III | Initial Public Offering | Sponsor                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Aggregate amount                   $ 6,900,000    
CONCORD ACQUISITION CORP III | Private Placement Warrants                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Number of warrants issued                   9,400,000    
CONCORD ACQUISITION CORP III | Public Warrants                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Number of warrants issued                   17,250,000    
CONCORD ACQUISITION CORP III | Class A common stock                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Holders of number of shares who exercised their right to redeem shares     98,573 30,460,066                
Conversion of Class B common stock to Class A common stock (in shares)   8,624,999                    
CONCORD ACQUISITION CORP III | Class B common stock                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Conversion of Class B common stock to Class A common stock (in shares)   8,624,999                    
CONCORD ACQUISITION CORP III | Class B common stock | Sponsor | Non Redemption Agreements                        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES                        
Holders of number of shares who exercised their right to redeem shares             999,665          
Aggregate of shares             999,665          
Aggregate number of shares agreed to allocate by Sponsor           781,961            
Estimated aggregate fair value of the shares           $ 6,096,756 $ 884,554          
Estimated aggregate fair value of the shares (in dollars per share)           $ 7.80 $ 0.88