Goodwill and Intangible Assets (Tables)

12 Months Ended

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