Goodwill was $593.3 million as of September 30, 2026 and $575.3 million as of December 31, 2025. The following table displays the changes in the gross carrying amount of goodwill (in thousands):

The following table presents details of our intangible assets which include acquired identifiable intangible assets and capitalized internal-use software costs (in thousands):


		As of September 30, 2026						As of December 31, 2025
	Weighted Average Estimated Useful Life (years)	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Intangible assets subject to amortization:
Developed technology	6.3	$	154,055	$	(124,477)	$	29,578	$	146,855	$	(111,886)	$	34,969
Customer relationships	6.0	12,000		(12,000)		—		12,000		(11,906)		94
Trade names	0.0	2,619		(2,619)		—		2,619		(2,619)		—
Licensed IP	3.0	500		(83)		417		—		—		—
Total acquired intangible assets		169,174		(139,179)		29,995		161,474		(126,411)		35,063
Internal-use software	3.0	94,910		(66,359)		28,551		83,934		(53,892)		30,042
Total intangible assets		$	264,084	$	(205,538)	$	58,546	$	245,408	$	(180,303)	$	65,105

Intangible assets are expensed on a straight-line basis over the useful life of the asset. Amortization expense was $7.8 million and $8.9 million for the three months ended September 30, 2026 and 2025, respectively, and $25.2 million and $26.8 million for the nine months ended September 30, 2026 and 2025, respectively.

Estimated future amortization expense of the acquired identifiable intangible assets and completed capitalized internal-use software costs as of September 30, 2026 was as follows (in thousands):

The table above excludes the impact of $5.6 million of capitalized internal-use software costs for projects that have not been completed as of September 30, 2026, and therefore, all the costs associated with these projects have not been incurred.