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OTHER INTANGIBLES, NET | 3 Months Ended
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Mar. 31, 2024
OTHER INTANGIBLES, NET |
OTHER INTANGIBLES, NET | 11. OTHER INTANGIBLES, NET Intangible assets are amortized over their legal or estimated useful life. The following table provides a summary of the gross carrying value and accumulated amortization by each major intangible class as of March 31, 2024, and December 31, 2023: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | March 31, 2024 | ​ | ​ | December 31, 2023
(in thousands) | ​ | ​ | Gross Carrying Amount | ​ | ​ | Accumulated Amortization | ​ | ​ | Gross Carrying Amount | ​ | ​ | Accumulated Amortization
Finite-lived Intangibles: | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
Customer relationships | ​ | $ | 10,000 | ​ | $ | (750) | ​ | $ | 10,000 | ​ | $ | (500)
Trade names and trademarks | ​ | ​ | 3,519 | ​ | ​ | (559) | ​ | ​ | 3,519 | ​ | ​ | (479)
Software licenses | ​ | ​ | 2,202 | ​ | ​ | (2,110) | ​ | ​ | 2,202 | ​ | ​ | (1,917)
Patents and technology | ​ | ​ | 300 | ​ | ​ | (300) | ​ | ​ | 300 | ​ | ​ | (300)
​ | ​ | $ | 16,021 | ​ | $ | (3,719) | ​ | $ | 16,021 | ​ | $ | (3,196)
​ Amortization expense for each of the periods presented follows: ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | Three months ended
​ | ​ | ​ | March 31,
(in thousands) |  |  | ​ | 2024 | ​ | ​ | 2023
Amortization of finite-lived intangible assets | ​ | ​ | $ | 523 | ​ | $ | 200
​ Estimated amortization expense based on balances as of March 31, 2024, were as follows: $1.2 million for the remainder of 2024; $1.3 million for the years 2025 to 2029. ​

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- Definition The entire disclosure for all or part of the information related to intangible assets. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350-30/tableOfContent + Details
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