During the fourth quarter of fiscal years 2023 and 2022, the Company completed a goodwill impairment analysis for its single reporting unit. The Company determined that the carrying value of its reporting unit was in excess of its fair value and recorded a non-cash impairment charge of $1,182 and $810 during the fourth quarter of fiscal years 2023 and 2022, respectively. This impairment reduced the goodwill to $90 and $0 as of December 31, 2023 and 2022, respectively. When performing quantitative testing, the Company first estimates the fair values of its reporting unit using a combination of an income and market approach. The single step is to determine the estimated fair value of the reporting unit and compare it to the carrying value of the reporting unit, including goodwill. The majority of the inputs used in the discounted cash flow model are unobservable and thus are considered to be Level 3 inputs. See Note A – Organization and Summary of Significant Accounting Policies for more detail of methodology.

The following table summarizes the activity in the Company’s goodwill balance:

The following table presents details of the Company’s intangible assets, estimated lives and related accumulated amortization:

The Company recorded amortization expense of $294 and $163 for the years ended December 31, 2023 and 2022, respectively. The following table presents future estimated amortization expense based on existing intangible assets held for use:

Actual future estimated amortization expense could differ from these estimated amounts as a result of future acquisitions, dispositions, impairments, and other factors or changes.