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Goodwill and Intangible Assets | 6 Months Ended
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Jun. 30, 2024
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 six months ended June 30, 2024, categorized by reportable segments, is as follows (in thousands):
| Clear Aligner |  | Systems and Services |  | Total
Balance as of December 31, 2023 | $ | 111,086 |  |  | $ | 308,444 |  |  | $ | 419,530 |
Additions from acquisition | 47,673 |  |  | — |  |  | 47,673 |
Foreign currency translation adjustments | (3,091) |  |  | (9,619) |  |  | (12,710) |
Balance as of June 30, 2024 | $ | 155,668 |  |  | $ | 298,825 |  |  | $ | 454,493 |
Finite-Lived Intangible Assets Acquired finite-lived intangible assets were as follows, excluding intangibles that were fully amortized, is as follows (in thousands):
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of June 30, 2024 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of June 30, 2024
Existing technology | 11 |  | $ | 146,651 |  |  | $ | (44,869) |  |  | $ | — |  |  | $ | 101,782 |
Customer relationships | 10 |  | 21,500 |  |  | (9,138) |  |  | — |  |  | 12,362 |
Trademarks and tradenames | 10 |  | 16,600 |  |  | (8,374) |  |  | (4,122) |  |  | 4,104 |
Patents | 12 |  | 480 |  |  | (260) |  |  | — |  |  | 220 |
|  |  | $ | 185,231 |  |  | $ | (62,641) |  |  | $ | (4,122) |  |  | 118,468 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | (2,763) |
Total intangible assets, net 1 |  |  |  |  |  |  |  |  | $ | 115,705 |
1 Includes $46.7 million of fully amortized intangible assets.
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of December 31, 2023 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2023
Existing technology | 10 |  | $ | 112,051 |  |  | $ | (45,331) |  |  | $ | (4,328) |  |  | $ | 62,392 |
Customer relationships | 10 |  | 21,500 |  |  | (8,063) |  |  | — |  |  | 13,437 |
Trademarks and tradenames | 10 |  | 16,600 |  |  | (7,605) |  |  | (4,122) |  |  | 4,873 |
Patents | 8 |  | 6,511 |  |  | (6,082) |  |  | — |  |  | 429 |
|  |  | $ | 156,662 |  |  | $ | (67,081) |  |  | $ | (8,450) |  |  | 81,131 |
Foreign currency translation adjustments |  |  |  |  |  |  |  |  | 987 |
Total intangible assets, net 1 |  |  |  |  |  |  |  |  | $ | 82,118 |
1 Includes $34.3 million of fully amortized intangible assets. Of the $146.7 million recorded as existing technology intangible assets as of June 30, 2024, $47.0 million was acquired during the first quarter of 2024 as part of the Cubicure Acquisition. The existing technology acquired in the Cubicure Acquisition had an estimated useful life of 13 years, which had the effect of increasing the weighted average amortization period from approximately 10 years as of December 31, 2023 to approximately 11 years as of June 30, 2024. Refer to Note 4. Business Combination. The total estimated annual future amortization expense for these acquired intangible assets as of June 30, 2024, is as follows (in thousands):
Fiscal Year Ending December 31, |  | Amortization
Remainder of 2024 |  | $ | 9,287 |
2025 |  | 18,574 |
2026 |  | 17,969 |
2027 |  | 15,607 |
2028 |  | 14,505 |
Thereafter |  | 42,526 |
Total |  | $ | 118,468 |
Amortization expense for the three months ended June 30, 2024 and 2023 was $4.7 million and $4.1 million, respectively, and amortization expense for the six months ended June 30, 2024 and 2023 was $9.6 million and $8.2 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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