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Goodwill and Intangible Assets (Tables) | 12 Months Ended
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Dec. 31, 2023
Goodwill and Intangible Assets Disclosure [Abstract] |
Changes in Carrying Amount of Goodwill by Segment | The changes in the carrying amount of goodwill by reportable segments for the years ended December 31, 2023 and 2022 are as follows:
|  | Robotics |  |  | Wireless Test |  |  | Semiconductor Test |  |  | System Test |  |  | Total |
|  | (in thousands) |
Balance at December 31, 2021: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ | 405,971 |  |  | $ | 361,819 |  |  | $ | 262,101 |  |  | $ | 158,699 |  |  | $ | 1,188,590 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  |  | 405,971 |  |  |  | 7,976 |  |  |  | 1,561 |  |  |  | 10,516 |  |  |  | 426,024 |
Foreign currency translation adjustment |  |  | (22,805 | ) |  |  | — |  |  |  | (24 | ) |  |  | — |  |  |  | (22,829 | )
Balance at December 31, 2022: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 383,166 |  |  |  | 361,819 |  |  |  | 262,077 |  |  |  | 158,699 |  |  |  | 1,165,761 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  |  | 383,166 |  |  |  | 7,976 |  |  |  | 1,537 |  |  |  | 10,516 |  |  |  | 403,195 |
Foreign currency translation adjustment |  |  | 12,297 |  |  |  | — |  |  |  | 160 |  |  |  | — |  |  |  | 12,457 |
Balance at December 31, 2023: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  |  | 395,463 |  |  |  | 361,819 |  |  |  | 262,237 |  |  |  | 158,699 |  |  |  | 1,178,218 |
Accumulated impairment losses |  |  | — |  |  |  | (353,843 | ) |  |  | (260,540 | ) |  |  | (148,183 | ) |  |  | (762,566 | )
|  | $ | 395,463 |  |  | $ | 7,976 |  |  | $ | 1,697 |  |  | $ | 10,516 |  |  | $ | 415,652 |
Schedule of Amortizable Intangible Assets | Amortizable intangible assets consist of the following and are included in intangible assets, net on the balance sheets:
|  | December 31, 2023 |
|  | Gross Carrying Amount (1) |  |  | Accumulated Amortization (1) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 267,706 |  |  | $ | (243,191 | ) |  | $ | (5,343 | ) |  | $ | 19,172 |
Customer relationships |  |  | 52,109 |  |  |  | (47,850 | ) |  |  | 232 |  |  |  | 4,491 |
Tradenames and trademarks |  |  | 59,007 |  |  |  | (46,021 | ) |  |  | (1,245 | ) |  |  | 11,741 |
Total intangible assets |  | $ | 378,822 |  |  | $ | (337,062 | ) |  | $ | (6,356 | ) |  | $ | 35,404 |
|  | December 31, 2022 |
|  | Gross Carrying Amount (1) |  |  | Accumulated Amortization (1) |  |  | Foreign Currency Translation Adjustment |  |  | Net Carrying Amount |
|  | (in thousands) |
Developed technology |  | $ | 270,967 |  |  | $ | (234,208 | ) |  | $ | (5,935 | ) |  | $ | 30,824 |
Customer relationships |  |  | 57,739 |  |  |  | (51,186 | ) |  |  | 172 |  |  |  | 6,725 |
Tradenames and trademarks |  |  | 59,387 |  |  |  | (41,930 | ) |  |  | (1,528 | ) |  |  | 15,929 |
Total intangible assets |  | $ | 388,093 |  |  | $ | (327,324 | ) |  | $ | (7,291 | ) |  | $ | 53,478 |
(1) In 2023 and 2022, $9.3 million and $1.6 million, respectively, of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.
Schedule of Estimated Intangible Assets Amortization Expense | Estimated intangible assets amortization expense for each of the five succeeding fiscal years is as follows:
Year |  | Amortization Expense |
|  | (in thousands) |
2024 |  | $ | 18,983 |
2025 |  |  | 11,402 |
2026 |  |  | 2,390 |
2027 |  |  | 1,173 |
2028 |  |  | 1,092 |
Thereafter |  |  | 364 |

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