Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Other Intangible Assets, Net

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Other Intangible Assets, Net
 12 Months Ended
Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract]  
Other Intangible Assets, Net
Note 9. Other Intangible Assets, Net
Other intangible assets consisted of the following:
December 31, 2023 December 31, 2022
Carrying Amount, net of Impairment Accumulated Amortization Net book value   Carrying Amount, net of Impairment Accumulated Amortization Net book value
(U.S. $ in thousands)
Developed technology $ 403,180  $ (300,780) $ 102,400  $ 387,603  $ (283,671) $ 103,932 
Patents 19,396  (10,246) 9,150  17,508  (8,970) 8,538 
Trademarks and trade names 22,286  (15,936) 6,350  16,278  (14,030) 2,248 
Customer relationships 102,520  (92,639) 9,881  93,609  (86,925) 6,684 
Capitalized software development costs 4,367  (4,367) —  7,066  (7,066) — 
$ 551,749  $ (423,968) $ 127,781  $ 522,064  $ (400,662) $ 121,402 

Amortization expenses
Amortization expense relating to intangible assets for the years ended December 31, 2023, 2022 and 2021, was approximately $26.5 million, $37.1 million and $31.3 million, respectively.
As of December 31, 2023, estimated future amortization expense relating to definite life intangible assets for each of the next five years and thereafter were as follows:
Estimated amortization expenses
Year ending December 31, (U.S. $ in thousands)
2024 $ 23,476 
2025 21,000 
2026 20,923 
2027 20,083 
2028 15,927 
2029 and Thereafter 26,372 
Total $ 127,781 

No impairment charges were recorded during 2023, 2022 and 2021.