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Goodwill and Long-lived Assets | 3 Months Ended
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Mar. 31, 2020
Notes To Financial Statements [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, 2020, all attributable to our Clear Aligner reporting unit, is as follows (in thousands):
| Total
Balance as of December 31, 2019 | $ | 63,924 |
Adjustments 1 | (640) |
Balance as of March 31, 2020 | $ | 63,284 |
1 Adjustments were related to foreign currency translation within the measurement period. During the fourth quarter of fiscal 2019, we performed the annual goodwill impairment testing and found no impairment as the fair value of our Clear Aligner reporting unit was significantly in excess of the carrying value. Intangible Long-Lived Assets Acquired intangible long-lived assets are being amortized as follows (in thousands):
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of March 31, 2020 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of March 31, 2020
Trademarks | 15 |  | $ | 7,100 |  |  | $ | (2,080) |  |  | $ | (4,179) |  |  | $ | 841 |
Existing technology | 13 |  | 12,600 |  |  | (5,972) |  |  | (4,328) |  |  | 2,300 |
Customer relationships | 11 |  | 33,500 |  |  | (18,870) |  |  | (10,751) |  |  | 3,879 |
Reacquired rights | 3 |  | 7,500 |  |  | (7,500) |  |  | — |  |  | — |
Patents | 8 |  | 6,796 |  |  | (3,377) |  |  | — |  |  | 3,419 |
Other | 2 |  | 618 |  |  | (590) |  |  | — |  |  | 28 |
Total intangible assets |  |  | $ | 68,114 |  |  | $ | (38,389) |  |  | $ | (19,258) |  |  | $ | 10,467 |
| Weighted Average Amortization Period (in years) |  | Gross Carrying Amount as of December 31, 2019 |  | Accumulated Amortization |  | Accumulated Impairment Loss |  | Net Carrying Value as of December 31, 2019
Trademarks | 15 |  | $ | 7,100 |  |  | $ | (2,045) |  |  | $ | (4,179) |  |  | $ | 876 |
Existing technology | 13 |  | 12,600 |  |  | (5,831) |  |  | (4,328) |  |  | 2,441 |
Customer relationships | 11 |  | 33,500 |  |  | (18,405) |  |  | (10,751) |  |  | 4,344 |
Reacquired rights | 3 |  | 7,500 |  |  | (7,059) |  |  | — |  |  | 441 |
Patents | 8 |  | 6,796 |  |  | (3,165) |  |  | — |  |  | 3,631 |
Other | 2 |  | 618 |  |  | (583) |  |  | — |  |  | 35 |
Total intangible assets |  |  | $ | 68,114 |  |  | $ | (37,088) |  |  | $ | (19,258) |  |  | $ | 11,768 |
The total estimated annual future amortization expense for these acquired intangible assets as of March 31, 2020 is as follows (in thousands):
Fiscal Year Ending December 31, |  | Amortization
Remainder of 2020 |  | $ | 2,544 |
2021 |  | 3,372 |
2022 |  | 2,116 |
2023 |  | 1,495 |
2024 |  | 555 |
Thereafter |  | 385 |
Total |  | $ | 10,467 |
Amortization expense for the three months ended March 31, 2020 and 2019 was $1.3 million and $1.5 million, respectively.

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- Definition Notes to Financial Statements [Abstract] + References No definition available. + Details
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- Definition The entire disclosure for goodwill and intangible assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -URI http://asc.fasb.org/topic&trid=2144416 + Details
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