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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2021
Goodwill and Intangible Assets Disclosure [Abstract] |
Schedule of Goodwill | The change in the carrying value of goodwill for the year ended December 31, 2021 and 2020, categorized by reportable segments, is as follows (in thousands):
|  | Clear Aligner |  | Systems and Services |  | Total
Balance as of December 31, 2019 |  | $ | 63,924 |  |  | $ | — |  |  | $ | 63,924 |
Additions from acquisition |  | 43,500 |  |  | 296,681 |  |  | 340,181 |
Foreign currency translation adjustments |  | 5,267 |  |  | 35,445 |  |  | 40,712 |
Balance as of December 31, 2020 |  | 112,691 |  |  | 332,126 |  |  | 444,817 |
Additions from acquisition |  | 3,646 |  |  | — |  |  | 3,646 |
Foreign currency translation adjustments |  | (4,129) |  |  | (25,787) |  |  | (29,916) |
Balance as of December 31, 2021 |  | $ | 112,208 |  |  | $ | 306,339 |  |  | $ | 418,547 |
Schedule of Amortized Intangible 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 December 31, 2021 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2021
Existing technology |  | 10 |  | $ | 104,531 |  |  | $ | (22,495) |  |  | $ | (4,328) |  |  | $ | 77,708 |
Customer relationships |  | 11 |  | 55,000 |  |  | (25,891) |  |  | (10,751) |  |  | 18,358 |
Trademarks and tradenames |  | 10 |  | 17,200 |  |  | (4,547) |  |  | (4,179) |  |  | 8,474 |
Patents and other |  | 8 |  | 6,511 |  |  | (4,495) |  |  | — |  |  | 2,016 |
|  |  |  | $ | 183,242 |  |  | $ | (57,428) |  |  | $ | (19,258) |  |  | 106,556 |
Foreign currency translation |  |  |  |  |  |  |  |  |  | 3,153 |
Total intangible assets |  |  |  |  |  |  |  |  |  | $ | 109,709 |
|  | Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of December 31, 2020 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2020
Existing technology |  | 10 |  | $ | 99,400 |  |  | $ | (12,719) |  |  | $ | (4,328) |  |  | $ | 82,353 |
Customer relationships |  | 11 |  | 55,000 |  |  | (21,879) |  |  | (10,751) |  |  | 22,370 |
Trademarks and tradenames |  | 10 |  | 16,600 |  |  | (2,934) |  |  | (4,179) |  |  | 9,487 |
Patents and other |  | 8 |  | 6,610 |  |  | (3,785) |  |  | — |  |  | 2,825 |
|  |  |  | $ | 177,610 |  |  | $ | (41,317) |  |  | $ | (19,258) |  |  | 117,035 |
Foreign currency translation |  |  |  |  |  |  |  |  |  | 13,037 |
Total intangible assets |  |  |  |  |  |  |  |  |  | $ | 130,072 |
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, 2021 is as follows (in thousands):
Fiscal Year |  | Amortization
2022 |  | $ | 15,692 |
2023 |  | 14,997 |
2024 |  | 13,831 |
2025 |  | 13,455 |
2026 |  | 12,849 |
Thereafter |  | 35,732 |
Total |  | $ | 106,556 |

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