The Company capitalizes costs for software to be sold, marketed, or leased to customers. Costs incurred internally in researching and developing software products are charged to expense until technological feasibility has been established for the product. Once technological feasibility is established, software costs are capitalized until the product is available for general release to customers. Judgment is required in determining when technological feasibility of a product is established. The amortization of these costs is included in cost of revenue over the estimated life of the products.

The following table summarizes identifiable intangible assets of the Company as of March 31, 2024 and December 31, 2024 (in thousands):


December 31, 2024	Useful Lives (In Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized:
Customer relationships	9 - 13	$	202,264	$	(17,592)	$	184,672
Trademark and tradename	3 - 15	21,562		(5,229)		16,333
Patents	7 - 11	628		(531)		97
Technology	5 - 7	72,769		(17,549)		55,220
Software to be sold or leased	3 - 7	8,423		(1,516)		6,907
		305,646		(42,417)		263,229

Unamortized:
Customer list		104		—		104
Trademark and tradename		63		—		63

		167		—		167

Total		$	305,813	$	(42,417)	$	263,396


March 31, 2024	Useful Lives (In Years)	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Amortized:
Customer relationships	9 - 12	$	19,264	$	(8,012)	$	11,252
Trademark and tradename	3 - 15	7,553		(3,877)		3,676
Patents	7 - 11	628		(464)		164
Technology	7	10,911		(10,911)		—
Software to be sold or leased	3	5,159		(764)		4,395
		43,515		(24,028)		19,487

Unamortized:
Customer list		104		—		104
Trademark and tradename		61		—		61

		165		—		165

Total		$	43,680	$	(24,028)	$	19,652

At December 31, 2024, the weighted-average amortization periods for customer relationships, trademarks and tradenames, patents, technology, and capitalized software to be sold or leased were 12.8, 12.1, 7.0, 4.7, and 5.0 years, respectively.

Amortization expense for the three- and nine-month periods ended December 31, 2023 was $1,148 and $4,317, respectively, and for the three- and nine-month periods ended December 31, 2024 was $8,966 and $18,389, respectively.

Estimated future amortization expense for each of the five succeeding fiscal years for these intangible assets is as follows:

Refer to Note 3 for the change in the carrying amount of goodwill from April 1, 2024 to December 31, 2024 as a result of the MiX Combination and FC Acquisition.