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Intangible Assets | 9 Months Ended
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Sep. 30, 2022
Goodwill and Intangible Assets Disclosure [Abstract] |
Intangible Assets | Intangible Assets The following table summarizes the carrying amount of intangible assets, net of accumulated amortization.
|  | September 30, 2022
(in thousands) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Amount
Patents |  | $ | 1,473 |  |  | $ | (1,249) |  |  | $ | 224 |
Acquired intellectual property and reacquired rights |  | 15,126 |  |  | (9,580) |  |  | 5,546 |
Internal-use software implementation costs |  | 2,873 |  |  | (1,804) |  |  | 1,069 |
|  | $ | 19,472 |  |  | $ | (12,633) |  |  | $ | 6,839 |
|  | December 31, 2021
(in thousands) |  | Gross Carrying Value |  | Accumulated Amortization |  | Net Carrying Amount
Patents |  | $ | 1,471 |  |  | $ | (1,176) |  |  | $ | 295 |
Acquired intellectual property and reacquired rights |  | 15,126 |  |  | (8,804) |  |  | 6,322 |
Internal-use software implementation costs |  | 2,873 |  |  | (1,086) |  |  | 1,787 |
|  | $ | 19,470 |  |  | $ | (11,066) |  |  | $ | 8,404 |
Amortization expense for the three months ended September 30, 2022 and 2021 was $0.5 million for both periods and for the nine months ended September 30, 2022 and 2021 was $1.6 million for both periods.

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -URI https://asc.fasb.org/subtopic&trid=2144471 + Details
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