
	March 31, 2025							December 31, 2024
	Remaining Weighted- Average Useful Life (In years)	Gross Carrying Amount		Accumulated Amortization		Net Book Value		Gross Carrying Amount		Accumulated Amortization		Net Book Value
Acquired developed technologies	7.6	$	7,888,175	$	(3,170,017)	$	4,718,158	$	7,699,423	$	(2,943,728)	$	4,755,695
Manufacturing contracts	—	11,577		(11,577)		—		11,121		(11,121)		—
Trademarks	—	2,879		(2,879)		—		2,868		(2,868)		—


Total finite-lived intangible assets		$	7,902,631	$	(3,184,473)	$	4,718,158	$	7,713,412	$	(2,957,717)	$	4,755,695

The increase in the gross carrying amount of intangible assets as of March 31, 2025, compared to December 31, 2024, relates to the positive impact of foreign currency translation adjustments primarily due to the strengthening of sterling against the U.S. dollar.

The assumptions and estimates used to determine future cash flows and remaining useful lives of our intangible and other long-lived assets are complex and subjective. They can be affected by various factors, including external factors, such as industry and economic trends, and internal factors such as changes in our business strategy and our forecasts for specific product lines.

Based on finite-lived intangible assets recorded as of March 31, 2025, and assuming the underlying assets will not be impaired and that we will not change the expected lives of the assets, future amortization expenses were estimated as follows (in thousands):


Year Ending December 31,	Estimated Amortization Expense
2025 (remainder)	$	475,293
2026	633,724
2027	633,724
2028	632,392
2029	630,658
Thereafter	1,712,367
Total	$	4,718,158