9. Intangible Assets and Goodwill

Intangible assets

The Company has intangible assets acquired through business acquisitions (Note 8). The estimated useful life of acquired technology is two to seven years and the estimated useful life of sublease assets is two years. The Company also purchased rights to the domain name "connect.com" and the cost is amortized on a straight-line basis over its estimated useful life of seven years. Other intangible assets have estimated useful lives of two to three years. The Company evaluates the useful lives of these assets on an annual basis and tests for impairment whenever events or changes in circumstances occur that could impact the recoverability of these assets.

Amortization expense related to intangible assets was $12.1 million in 2025, $9.6 million in 2024, and $5.3 million in 2023. Amortization expense of acquired technology is included in cost of subscription revenue and cost of professional services and other revenue. Amortization expense of customer relationships and the domain name is included in sales and marketing expense in the consolidated statements of operations.

Estimated future amortization expense for intangible assets as of December 31, 2025 is as follows:
 

Goodwill

Goodwill represents the excess of the purchase price in a business combination over the fair value of net assets acquired and is generally not deductible for tax purposes. Goodwill amounts are not amortized, but rather tested for impairment annually.