The carrying amounts of external-use software development costs were as follows:


	March 31, 2025		December 31, 2024

	(In thousands)
Gross carrying amount	$	254,111	$	249,335
Accumulated amortization	(196,576)		(190,899)
External-use software development costs, net (1)	$	57,535	$	58,436

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(1) Included in other long-term assets in the Condensed Consolidated Balance Sheets.

The Company recorded $5.7 million and $6.7 million to cost of product revenues for amortization of external-use software development costs for the three months ended March 31, 2025 and 2024, respectively.

The estimated future amortization expenses for external-use software development costs were as follows:


	March 31, 2025

	(In thousands)
Remaining nine months of 2025	$	15,923
2026	17,169
2027	11,236
2028	7,379
2029	4,752
Thereafter	1,076
Total	$	57,535