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Goodwill and Intangible Assets (Tables)
9 Months Ended
Sep. 30, 2021
Notes To Financial Statements [Abstract]  
Summary of Goodwill by Reportable Segment
The change in the carrying value of goodwill for the nine months ended September 30, 2021, categorized by reportable segments, is as follows (in thousands):
Clear AlignerSystems and ServicesTotal
Balance as of December 31, 2020$112,691 $332,126 $444,817 
Additions from acquisition3,646 — 3,646 
Foreign currency translation adjustments
(3,062)(18,807)(21,869)
Balance as of September 30, 2021$113,275 $313,319 $426,594 
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
September 30, 2021
Accumulated
Amortization
Accumulated
Impairment Loss
Net Carrying
Value as of
September 30, 2021
Existing technology10$104,531 $(19,923)$(4,328)$80,280 
Customer relationships1155,000 (24,888)(10,751)19,361 
Trademarks and tradenames1016,600 (4,087)(4,179)8,334 
Patents and other 86,511 (4,296)— 2,215 
$182,642 $(53,194)$(19,258)110,190 
Foreign currency translation5,604 
Total intangible assets$115,794 

Weighted Average Amortization Period
(in years)
Gross Carrying
Amount as of December 31, 2020
Accumulated
Amortization
Accumulated Impairment LossNet Carrying
Value as of
December 31, 2020
Existing technology10$99,400 $(12,719)$(4,328)$82,353 
Customer relationships1155,000 (21,879)(10,751)22,370 
Trademarks and tradenames1016,600 (2,934)(4,179)9,487 
Patents and other86,610 (3,785)— 2,825 
177,610 (41,317)(19,258)117,035 
Foreign currency translation13,037 
Total intangible assets$130,072 
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense The total estimated annual future amortization expense for these acquired intangible assets as of September 30, 2021 is as follows (in thousands):
Fiscal Year Ending December 31,Amortization
Remainder of 2021$4,158 
202215,392 
202314,772 
202413,831 
202513,455 
Thereafter48,582 
Total$110,190