8. Intangible Assets and Goodwill

Acquired intangible assets subject to amortization consist of the following (in thousands):

As of December 31, 2025, the weighted average remaining useful life for customer relationships was 11.4 years, developed technologies was 1.4 years, and capitalized software development costs was 0.3 years.

Amortization expense for customer relationships intangible assets is included in selling and marketing expenses, amortization expense for developed technologies intangible assets is included in cost of software solutions revenue, amortization expense for trademark and trade name intangible assets is included in general and administrative expenses, amortization expense for capitalized software development costs intangible assets is included in general and administrative expenses. The following table summarizes the amortization expense by financial statement line item (in thousands):

As of December 31, 2025, annual amortization of definite lived intangible assets, based on existing intangible assets and current useful lives, is estimated to be the following (in thousands):

The following table provides a summary of changes in the carrying amounts of goodwill (in thousands):