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INCOME TAX - Deferred tax assets (Details) - USD ($) | Dec. 31, 2023 | Dec. 31, 2022
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Components of Deferred Tax Assets [Abstract] |  |
Gross deferred tax assets | $ 98,377,000 | $ 95,371,000
Valuation allowance | (97,628,000) | (94,446,000)
Deferred tax asset, net of allowance | (749,000) | (925,000)
CONCORD ACQUISITION CORP III |  |
Components of Deferred Tax Assets [Abstract] |  |
Organizational costs/startup expenses | 1,223,864 | 243,656
Federal net operating loss carryforward | 0 | 0
Gross deferred tax assets | 1,223,864 | 243,656
Valuation allowance | (1,223,864) | (243,656)
Deferred tax asset, net of allowance | $ 0 | $ 0

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-2 + Details
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