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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Tables) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2024 | Dec. 31, 2023
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Schedule of reconciliation of net (loss) income per common share | The following table summarizes the computation of basic and diluted net income (loss) per share (in thousands, except per share amounts):
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended March 31,
​ |  | 2024 |  | 2023
Numerator: |  | ​ |  |  | ​ |
Net income (loss), basic and diluted | ​ | $ | 757 | ​ | $ | (1,393)
Denominator: | ​ |  |  | ​ |  |
Weighted-average common shares outstanding, basic | ​ |  | 25,468 | ​ |  | 23,862
Add: effect of dilutive securities | ​ |  | 789 | ​ |  | —
Weighted-average common shares outstanding, diluted | ​ |  | 26,257 | ​ |  | 23,862
Net income (loss) per share, basic and diluted | ​ |  |  | ​ |  |
Basic | ​ | $ | 0.03 | ​ | $ | (0.06)
Diluted | ​ | $ | 0.03 | ​ | $ | (0.06)
CONCORD ACQUISITION CORP III |  |
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES |  |
Schedule of changes in Class A common stock subject to possible redemption |  | For the year ended December 31, 2023 and 2022, the changes in Class A common stock subject to possible redemption are as follows: ​
​ | ​ | ​ | ​ | ​ | ​
Class A common stock subject to possible redemption |  |  |  |  | ​
​ | ​ | Shares | ​ | Amount
January 1, 2022 |  | 34,500,000 | ​ | $ | 351,900,000
Plus: |  |  | ​ |  |
Increase in redemption value of shares subject to possible redemption |  | — | ​ |  | 3,743,935
December 31, 2022 |  | 34,500,000 | ​ | $ | 355,643,935
​ | ​ | ​ | ​ | ​ | ​
January 1, 2023 |  | 34,500,000 | ​ | $ | 355,643,935
Plus: |  |  | ​ |  |
Increase in redemption value of shares subject to possible redemption |  | — | ​ |  | 5,209,575
Less: |  |  | ​ |  |
Redemption |  | (30,558,639) | ​ |  | (318,441,770)
December 31, 2023 |  | 3,941,361 | ​ | $ | 42,411,740
Schedule of reconciliation of net (loss) income per common share |  | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Year Ended December 31,
​ | ​ | 2023 | ​ | 2022
​ | ​ | ​ | ​ | Non- | ​ | ​ | ​ | Non-
​ | ​ | ​ | ​ | Redeemable | ​ | ​ | ​ | Redeemable
​ | ​ | Redeemable | ​ | Class A and | ​ | Redeemable | ​ | Class A and
​ |  | Class A |  | Class B |  | Class A |  | Class B
Basic and diluted net (loss) income per share |  | ​ |  |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Numerator: |  | ​ |  |  | ​ |  | ​ | ​ | ​ | ​ | ​ | ​
Allocation of net (loss) income | ​ | $ | (1,247,339) | ​ | $ | (748,415) | ​ | $ | 19,405,027 | ​ | $ | 4,851,257
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Denominator: | ​ |  |  | ​ |  |  | ​ | ​ | ​ | ​ | ​ | ​
Weighted-average shares outstanding | ​ |  | 14,374,778 | ​ | ​ | 8,625,000 | ​ | ​ | 34,500,000 | ​ | ​ | 8,625,000
Basic and diluted net (loss) income per share | ​ | $ | (0.09) | ​ | $ | (0.09) | ​ | $ | 0.56 | ​ | $ | 0.56

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- Definition Tabular disclosure of an entity's basic and diluted earnings per share calculations, including a reconciliation of numerators and denominators of the basic and diluted per-share computations for income from continuing operations. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 260 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147482662/260-10-50-1 + Details
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- Definition Tabular disclosure of temporary equity. Temporary equity is a security with redemption features that are outside the control of the issuer, is not classified as an asset or liability in conformity with GAAP, and is not mandatorily redeemable. Includes any type of security that is redeemable at a fixed or determinable price or on a fixed or determinable date or dates, is redeemable at the option of the holder, or has conditions for redemption which are not solely within the control of the issuer. If convertible, the issuer does not control the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the conversion option if the holder exercises the option to convert the stock to another class of equity. If the security is a warrant or a rights issue, the warrant or rights issue is considered to be temporary equity if the issuer cannot demonstrate that it would be able to deliver upon the exercise of the option by the holder in all cases. Includes stock with put option held by ESOP and stock redeemable by holder only in the event of a change in control of the issuer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section S99 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480244/480-10-S99-1 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (27) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
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