Intangible assets as of June 30, 2026, and December 31, 2025, consisted of the following:


			As of June 30, 2026							As of December 31, 2025
(In thousands excluding years)	Weighted Average Useful Life (in years)		Gross Carrying Amount		Accumulated Amortization			Net Book Value		Gross Carrying Amount		Accumulated Amortization			Net Book Value
Customer relationships		11.0	$	55,060	$	(27,224	)	$	27,836	$	56,244	$	(25,306	)	$	30,938
Backlog		1.7		59,393		(59,393	)		—		61,081		(61,081	)		—
Developed technology		7.3		435,038		(194,420	)		240,618		429,329		(168,073	)		261,256
Licensed technology		9.0		5,900		(5,436	)		464		5,900		(5,108	)		792
Licensed agreements		8.5		560		(466	)		94		560		(446	)		114
Trade names		2.8		30,724		(30,248	)		476		31,598		(30,651	)		947
Total			$	586,675	$	(317,187	)	$	269,488	$	584,712	$	(290,665	)	$	294,047

No impairment losses related to intangible assets were recorded during the three and six months ended June 30, 2026 and 2025.

Amortization expense was $17.5 million and $15.7 million in the three months ended June 30, 2026 and 2025, respectively, and $34.4 million and $30.6 million in the six months ended June 30, 2026 and 2025, respectively and was included in cost of revenue, selling, general and administrative expenses and research and development expenses in the Condensed Consolidated Statements of Loss.

During the six months ended June 30, 2026, the Company had development costs of $16.7 million for developed technology assets with a weighted average amortization period of three years with no expected residual value.

Estimated future amortization expense of intangible assets is as follows:


	As of
(In thousands)	June 30, 2026
2026	$	34,679
2027		66,400
2028		57,765
2029		49,035
2030		44,246
Thereafter		17,363
Total	$	269,488