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Goodwill and Intangible Assets (Tables)
 6 Months Ended
Jun. 30, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill by Reportable Segment
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 AlignerSystems and ServicesTotal
Balance as of December 31, 2023
$111,086 $308,444 $419,530 
Additions from acquisition47,673 — 47,673 
Foreign currency translation adjustments
(3,091)(9,619)(12,710)
Balance as of June 30, 2024
$155,668 $298,825 $454,493 
Schedule of Amortized 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 technology11$146,651 $(44,869)$— $101,782 
Customer relationships1021,500 (9,138)— 12,362 
Trademarks and tradenames1016,600 (8,374)(4,122)4,104 
Patents 12480 (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 technology10$112,051 $(45,331)$(4,328)$62,392 
Customer relationships1021,500 (8,063)— 13,437 
Trademarks and tradenames1016,600 (7,605)(4,122)4,873 
Patents86,511 (6,082)— 429 
$156,662 $(67,081)$(8,450)81,131 
Foreign currency translation adjustments987 
Total intangible assets, net 1
$82,118 
1 Includes $34.3 million of fully amortized intangible assets.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
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 
202518,574 
202617,969 
202715,607 
202814,505 
Thereafter42,526 
Total$118,468