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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 |  |  |  |  |

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