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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Net income (loss) per common share (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Numerator:        
Allocation of net (loss) income $ 757,000 $ (1,393,000) $ (22,469,000) $ (28,649,000)
Net loss attributable to common stockholders - diluted $ 757,000 $ (1,393,000)    
Denominator:        
Weighted average number of common shares used in computing net loss per common share - basic 25,468,000 [1] 23,862,000 [1] 128,459,102 92,958,570
Weighted average number of common shares used in computing net loss per common share - diluted 26,257,000 [1] 23,862,000 [1] 128,459,102 92,958,570
Net loss per common share - basic $ 0.03 [1] $ (0.06) [1] $ (0.17) $ (0.31)
Net loss per common share - diluted $ 0.03 [1] $ (0.06) [1] $ (0.17) $ (0.31)
CONCORD ACQUISITION CORP III | Class A common stock        
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES        
Number of warrants to purchase shares issued     33,550,000  
Numerator:        
Allocation of net (loss) income     $ (1,247,339) $ 19,405,027
Denominator:        
Weighted average number of common shares used in computing net loss per common share - basic     14,374,778 34,500,000
Net loss per common share - basic     $ (0.09) $ 0.56
CONCORD ACQUISITION CORP III | Class B common stock        
Numerator:        
Allocation of net (loss) income     $ (748,415) $ 4,851,257
Denominator:        
Weighted average number of common shares used in computing net loss per common share - basic     8,625,000 8,625,000
Weighted average number of common shares used in computing net loss per common share - diluted     8,625,000 8,625,000
Net loss per common share - basic     $ (0.09) $ 0.56
Net loss per common share - diluted     $ (0.09) $ 0.56
[1] Amounts as of December 31, 2023 differ from those in prior year consolidated financial statements as they were retrospectively adjusted as a result of the accounting for the Business Combination (as defined in the Notes to the Unaudited Condensed Consolidated Financial Statements.)