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Goodwill and Intangible Assets | 3 Months Ended
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Mar. 31, 2025
Goodwill and Intangible Assets Disclosure [Abstract] |
Goodwill and Intangible Assets | Goodwill and Intangible Assets Goodwill The change in the carrying value of goodwill for the three months ended March 31, 2025, categorized by reportable segment, is as follows (in thousands):
| Clear Aligner |  | Systems and Services |  | Total
Balance as of December 31, 2024 | $ | 152,645 |  |  | $ | 289,985 |  |  | $ | 442,630 |
Foreign currency translation adjustments | 3,534 |  |  | 11,447 |  |  | 14,981 |
Balance as of March 31, 2025 | $ | 156,179 |  |  | $ | 301,432 |  |  | $ | 457,611 |
Finite-Lived Intangible Assets Acquired finite-lived intangible assets, excluding intangibles that were fully amortized, are as follows (in thousands):
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of March 31, 2025 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of March 31, 2025
Existing technology | 11 |  | $ | 146,651 |  |  | $ | (56,004) |  |  | $ | — |  |  | $ | 90,647 |
Customer relationships | 10 |  | 21,500 |  |  | (10,750) |  |  | — |  |  | 10,750 |
Trademarks and tradenames 1 | 7 |  | 9,800 |  |  | (7,000) |  |  | — |  |  | 2,800 |
Patents | 12 |  | 480 |  |  | (290) |  |  | — |  |  | 190 |
|  |  | $ | 178,431 |  |  | $ | (74,044) |  |  | $ | — |  |  | 104,387 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (1,637) |
Total intangible assets, net |  |  |  |  |  |  |  |  | $ | 102,750 |
1 The Weighted Average Amortization Period decreased from 10 years to 7 years due an intangible asset with a useful life of 15 years becoming fully amortized during the current quarter.
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of December 31, 2024 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2024
Existing technology | 11 |  | $ | 146,651 |  |  | $ | (52,238) |  |  | $ | — |  |  | $ | 94,413 |
Customer relationships | 10 |  | 21,500 |  |  | (10,079) |  |  | — |  |  | 11,421 |
Trademarks and tradenames | 10 |  | 16,600 |  |  | (9,255) |  |  | (4,122) |  |  | 3,223 |
Patents | 12 |  | 480 |  |  | (280) |  |  | — |  |  | 200 |
|  |  | $ | 185,231 |  |  | $ | (71,852) |  |  | $ | (4,122) |  |  | 109,257 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (5,769) |
Total intangible assets, net |  |  |  |  |  |  |  |  | $ | 103,488 |
The total estimated future amortization expense for these acquired finite-lived intangible assets as of March 31, 2025, is as follows (in thousands):
Fiscal Year Ending December 31, |  | Amortization
Remainder of 2025 |  | $ | 13,827 |
2026 |  | 17,923 |
2027 |  | 15,607 |
2028 |  | 14,505 |
2029 |  | 14,505 |
2030 |  | 6,328 |
Thereafter |  | 21,692 |
Total |  | $ | 104,387 |
Amortization expense for the three months ended March 31, 2025 and 2024 was $4.6 million and $5.0 million, respectively.

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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 30 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-30/tableOfContent Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 350 -SubTopic 20 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org/350-20/tableOfContent + Details
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