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Intangible Assets | 6 Months Ended
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Jun. 30, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | (5) Intangible Assets At June 30, 2023 and December 31, 2022, the Company's intangible assets with finite lives were as follows:
| June 30, 2023 |  | December 31, 2022
(in thousands) | Gross |  | Accumulated Amortization |  | Net |  | Gross |  | Accumulated Amortization |  | Net
Intangible assets with finite lives: |  |  |  |  |  |  |  |  |  |  |
Customer relationships | $ | 51,939 |  |  | $ | (50,180) |  |  | $ | 1,759 |  |  | $ | 51,137 |  |  | $ | (48,695) |  |  | $ | 2,442 |
Acquired technology | 55,931 |  |  | (14,059) |  |  | 41,872 |  |  | 55,480 |  |  | (10,707) |  |  | 44,773 |
Trade names | 36,210 |  |  | (13,965) |  |  | 22,245 |  |  | 35,930 |  |  | (12,455) |  |  | 23,475 |
Patent costs | 18,822 |  |  | (11,040) |  |  | 7,782 |  |  | 18,673 |  |  | (10,909) |  |  | 7,764 |
Acquired patents | 17,526 |  |  | (15,797) |  |  | 1,729 |  |  | 17,499 |  |  | (15,661) |  |  | 1,838 |
Other | 13,331 |  |  | (9,129) |  |  | 4,202 |  |  | 13,255 |  |  | (8,765) |  |  | 4,490 |
Total intangible assets | $ | 193,759 |  |  | $ | (114,170) |  |  | $ | 79,589 |  |  | $ | 191,974 |  |  | $ | (107,192) |  |  | $ | 84,782 |
The Company’s total intangible assets reported on the balance sheet include an indefinite-life intangible asset related to dp polar in-process research and development (“IPR&D”). The carrying value of this indefinite-life intangible asset was $5,541 and $5,448 as of June 30, 2023 and December 31, 2022. Amortization expense related to intangible assets was $3,258 a nd $6,497 for the three and six months ended June 30, 2023, respectively, compared to $3,303 and $5,980 for the three and six months ended June 30, 2022, respectively. Amortization expense for intangible assets is estimated to be $4,665 for the remainder of 2023, $11,133 in 2024, $11,058 in 2025, $8,399 in 2026 and $7,317 in 2027.

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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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