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Goodwill and Intangible Assets | 9 Months Ended
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Sep. 30, 2023
Notes To Financial Statements [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The change in the carrying value of goodwill for the nine months ended September 30, 2023, categorized by reportable segments, is as follows (in thousands):
| Clear Aligner |  | Systems and Services |  | Total
Balance as of December 31, 2022 | $ | 109,480 |  |  | $ | 298,071 |  |  | $ | 407,551 |
Foreign currency translation adjustments | (479) |  |  | (2,777) |  |  | (3,256) |
Balance as of September 30, 2023 | $ | 109,001 |  |  | $ | 295,294 |  |  | $ | 404,295 |
Intangible Long-Lived Assets Acquired intangible long-lived assets were as follows, excluding intangibles that were fully amortized (in thousands):
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of September 30, 2023 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of September 30, 2023
Existing technology | 10 |  | $ | 112,051 |  |  | $ | (42,383) |  |  | $ | (4,328) |  |  | $ | 65,340 |
Customer relationships | 10 |  | 21,500 |  |  | (7,525) |  |  | — |  |  | 13,975 |
Trademarks and tradenames | 10 |  | 17,200 |  |  | (7,820) |  |  | (4,122) |  |  | 5,258 |
Patents | 8 |  | 6,511 |  |  | (5,884) |  |  | — |  |  | 627 |
|  |  | $ | 157,262 |  |  | $ | (63,612) |  |  | $ | (8,450) |  |  | 85,200 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (2,459) |
Total intangible assets, net 1 |  |  |  |  |  |  |  |  | $ | 82,741 |
1 Also includes $33.5 million of fully amortized intangible assets related to customer relationships.
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of December 31, 2022 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2022
Existing technology | 10 |  | $ | 112,051 |  |  | $ | (33,537) |  |  | $ | (4,328) |  |  | $ | 74,186 |
Customer relationships | 10 |  | 21,500 |  |  | (5,913) |  |  | — |  |  | 15,587 |
Trademarks and tradenames | 10 |  | 17,200 |  |  | (6,442) |  |  | (4,122) |  |  | 6,636 |
Patents | 8 |  | 6,511 |  |  | (5,288) |  |  | — |  |  | 1,223 |
|  |  | $ | 157,262 |  |  | $ | (51,180) |  |  | $ | (8,450) |  |  | 97,632 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (1,912) |
Total intangible assets, net 1 |  |  |  |  |  |  |  |  | $ | 95,720 |
1 Also includes $33.5 million of fully amortized intangible assets related to customer relationships. The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2023 is as follows (in thousands):
Fiscal Year Ending December 31, |  | Amortization
Remainder of 2023 |  | $ | 4,069 |
2024 |  | 15,335 |
2025 |  | 14,959 |
2026 |  | 14,353 |
2027 |  | 11,992 |
Thereafter |  | 24,492 |
Total |  | $ | 85,200 |
Amortization expense for the three months ended September 30, 2023 and 2022 was $4.2 million and $3.9 million, respectively, and amortization expense for the nine months ended September 30, 2023 and 2022 was $12.4 million and $12.1 million, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 350 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//350/tableOfContent + Details
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