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Finite-Lived Intangible Assets | 6 Months Ended
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Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Finite-Lived Intangible Assets | Note 7. Finite-Lived Intangible Assets The following table presents the Company’s finite-lived intangible assets as of June 30, 2023:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | Gross | ​ | Accumulated | ​ | Net book | ​ | average life
​ |  | book value |  | amortization |  | value |  | (years)
Customer contracts | ​ | $ | 6,300 | ​ | $ | (982) | ​ | $ | 5,318 |  | 10
Trademark | ​ |  | 5,000 | ​ |  | (792) | ​ |  | 4,208 |  | 10
UL Listings | ​ |  | 2,700 | ​ |  | (357) | ​ |  | 2,343 |  | 12
Patents | ​ |  | 10,060 | ​ |  | (3,307) | ​ |  | 6,753 |  | Various
Finite-lived intangible assets | ​ | $ | 24,060 | ​ | $ | (5,438) | ​ | $ | 18,622 | ​ | ​
​ The following table presents the Company’s finite-lived intangible assets as of December 31, 2022:
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Weighted-
​ | ​ | Gross |  | Accumulated |  | Net book | ​ | average life
​ |  | book value |  | amortization |  | value |  | (years)
Customer contracts | ​ | $ | 6,300 | ​ | $ | (671) | ​ | $ | 5,629 |  | 10
Trademark | ​ |  | 5,000 | ​ |  | (542) | ​ |  | 4,458 |  | 10
UL Listings | ​ |  | 2,700 | ​ |  | (244) | ​ |  | 2,456 |  | 12
Patents | ​ |  | 10,060 | ​ |  | (1,126) | ​ |  | 8,934 |  | Various
Finite-lived intangible assets | ​ | $ | 24,060 | ​ | $ | (2,583) | ​ | $ | 21,477 | ​ | ​
​ During the three months ended June 30, 2023 and 2022, amortization expense related to finite-lived intangible assets was $1.4 million and $0.3 million, respectively, and during the six months ended June 30, 2023 and 2022, was $2.9 million and $0.7 million, respectively. The following table presents the estimated future amortization of the Company’s finite-lived intangible assets as of June 30, 2023:
​ | ​ | ​ | ​
Remainder of 2023 | ​ | $ | 3,535
2024 | ​ |  | 5,815
2025 | ​ |  | 1,355
2026 | ​ |  | 1,355
2027 | ​ |  | 1,355
Thereafter | ​ |  | 5,207
Total | ​ | $ | 18,622
​ The Company did not identify any impairment of its finite-lived intangible assets during the three and six months ended June 30, 2023 and 2022.

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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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