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INCOME TAX - Reconciliation of the federal income tax rate (Details) | 3 Months Ended | 12 Months Ended
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Mar. 31, 2024 | Mar. 31, 2023 | Dec. 31, 2023 | Dec. 31, 2022
INCOME TAX |  |  |  |
Income tax provision | 7.20% | 3.70% |  |
CONCORD ACQUISITION CORP III |  |  |  |
INCOME TAX |  |  |  |
Statutory federal income tax rate |  |  | 21.00% | 21.00%
Transaction costs |  |  | 0.00% | 0.00%
Change in fair value of warrant liability and Sponsor Loans |  |  | (100.30%) | (17.70%)
Transaction costs allocated to warrants |  |  | 12.80% | 0.00%
Change in valuation allowance |  |  | (160.70%) | 0.70%
Income tax provision |  |  | (227.20%) | 4.00%

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the valuation allowance for deferred tax assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.Fact.4) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479360/740-10-S99-1 + Details
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