The Company’s goodwill balance is attributable to its Content reporting unit and is tested for impairment annually on October 1 or upon a triggering event. No triggering events were identified during the three months ended March 31, 2024.

The following table summarizes the changes in the carrying value of the Company’s goodwill balance during the three months ended March 31, 2024 (in thousands):


	Goodwill
Balance as of December 31, 2023	$	383,325
Goodwill related to acquisitions	$	19,843
Foreign currency translation adjustment	(381)

Balance as of March 31, 2024	$	402,787

Intangible assets, all of which are subject to amortization, consisted of the following as of March 31, 2024 and December 31, 2023 (in thousands):


	As of March 31, 2024							As of December 31, 2023
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount		Weighted Average Life (Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortizing intangible assets:
Customer relationships	$	89,832	$	(28,664)	$	61,168	12	$	90,350	$	(26,982)	$	63,368
Trade name	38,142		(9,855)		28,287		12	37,937		(9,272)		28,665
Developed technology	116,354		(67,737)		48,617		5	115,914		(61,376)		54,538
Contributor content	66,590		(29,884)		36,706		8	65,628		(27,897)		37,731

Patents	259		(169)		90		18	259		(165)		94

Total	$	311,177	$	(136,309)	$	174,868		$	310,088	$	(125,692)	$	184,396

Amortization expense was $11.0 million and $9.8 million for the three months ended March 31, 2024 and 2023, respectively. Of these amounts, $10.0 million and $9.2 million are included in cost of revenue for the three months ended March 31, 2024 and 2023, respectively, and $1.0 million and $0.6 million are included in general and administrative expense for the three months ended March 31, 2024 and 2023, respectively.

The Company determined that there was no indication of impairment of the intangible assets for any period presented. Estimated amortization expense is: $27.0 million for the remaining nine months of 2024, $27.5 million in 2025, $25.2 million in 2026, $19.0 million in 2027, $16.5 million in 2028, $15.3 million in 2029 and $44.3 million thereafter.