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Goodwill and Intangible Assets (Tables)
 3 Months Ended
Mar. 31, 2024
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Goodwill by Reportable Segment
The change in the carrying value of goodwill for the three months ended March 31, 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
(2,180)(6,788)(8,968)
Balance as of March 31, 2024$156,579 $301,656 $458,235 
Finite-Lived
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
March 31, 2024
Accumulated
Amortization		Accumulated
Impairment Loss
Net Carrying
Value as of
March 31, 2024
Existing technology11$159,051 $(49,183)$(4,328)$105,540 
Customer relationships1021,500 (8,600)— 12,900 
Trademarks and tradenames1016,600 (7,990)(4,122)4,488 
Patents 12480 (250)— 230 
$197,631 $(66,023)$(8,450)123,158 
Foreign currency translation adjustments(1,734)
Total intangible assets, net 1
$121,424 
1 Includes $34.3 million of fully amortized intangible assets related to customer relationships and trademarks.

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 related to customer relationships and trademarks.
Schedule of Finite-Lived Intangible Assets, Future Amortization Expense
The total estimated annual future amortization expense for these acquired intangible assets as of March 31, 2024, is as follows (in thousands):

Fiscal Year Ending December 31,Amortization
Remainder of 2024
$13,977 
202518,574 
202617,969 
202715,607 
202814,505 
Thereafter42,526 
Total$123,158