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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The change in the carrying value of goodwill for the year ended December 31, 2023 and 2022, categorized by reportable segment, is as follows (in thousands):
|  | Clear Aligner |  | Systems and Services |  | Total
Balance as of December 31, 2021 |  | $ | 112,208 |  |  | $ | 306,339 |  |  | $ | 418,547 |
Additions from acquisition |  | — |  |  | 8,729 |  |  | 8,729 |
Foreign currency translation adjustments |  | (2,728) |  |  | (16,997) |  |  | (19,725) |
Balance as of December 31, 2022 |  | 109,480 |  |  | 298,071 |  |  | 407,551 |
Foreign currency translation adjustments |  | 1,606 |  |  | 10,373 |  |  | 11,979 |
Balance as of December 31, 2023 |  | $ | 111,086 |  |  | $ | 308,444 |  |  | $ | 419,530 |
Schedule of Amortized Intangible Assets | Acquired finite lived intangible assets were as follows, excluding intangible assets that were fully amortized (in thousands):
|  | 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 Also includes $34.3 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.
Schedule of Future Amortization for Finite-Lived Intangible Assets | The total estimated annual future amortization expense for these acquired intangible assets as of December 31, 2023 is as follows (in thousands):
Fiscal Year |  | Amortization
2024 |  | $ | 15,335 |
2025 |  | 14,959 |
2026 |  | 14,353 |
2027 |  | 11,992 |
2028 |  | 10,890 |
Thereafter |  | 13,602 |
Total |  | $ | 81,131 |

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