Intangible assets as of December 31, 2024 and 2023 consist of the following:


	Weighted Average Remaining Useful Life (in Years)	December 31,
		2024			2023
		(in thousands)
Acquired technology	3.8	$	49,791		$	46,362
Domain name	4.3		10,000			10,000
Sublease asset	1.3		980			980
Other intangible assets	2.5		1,279			69
Total intangible assets			62,050			57,411
Accumulated amortization			(24,487	)		(15,095	)
Intangible assets, net		$	37,563		$	42,316

The Company has intangible assets acquired through business acquisitions (Note 8). The estimated useful life of acquired technology is two to seven years and the estimated useful life of sublease assets is two years. The Company also purchased rights to the domain name "connect.com" and the cost is amortized on a straight-line basis over its estimated useful life of seven years. Other intangible assets have estimated useful lives of two to three years. The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Amortization expense related to intangible assets was $9.6 million in 2024, $5.3 million in 2023, and $2.6 million in 2022. Amortization expense of acquired technology is included in cost of subscription revenue and cost of professional services and other revenue. Amortization expense of customer relationships and the domain name is included in sales and marketing expense in the consolidated statements of operations.

Estimated future amortization expense for intangible assets as of December 31, 2024 is as follows:


Years ended December 31,	Amortization Expense
	(in thousands)
2025	$	10,559
2026		10,202
2027		8,251
2028		7,527
2029		1,024
Thereafter		—
Total	$	37,563

Goodwill represents the excess of the purchase price in a business combination over the fair value of net assets acquired and is generally not deductible for tax purposes. Goodwill amounts are not amortized, but rather tested for impairment annually.

The changes in the carrying amounts of goodwill consist of the following:


	(in thousands)
Balance as of December 31, 2022	$	46,227
Effect of foreign currency translation		440
Acquisition		127,094
Balance as of December 31, 2023		173,761
Effect of foreign currency translation		(636	)
Acquisition		36,383
Balance as of December 31, 2024	$	209,508