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Adjusted Earnings Before Interest, Taxes, Depreciation and Amortization (“Adjusted EBITDA”) is defined as operating income excluding: (1) stock-based compensation expense; (2) depreciation; and (3) acquisition-related items consisting of (i) amortization of intangible assets and impairments of goodwill and intangible assets, if applicable, and (ii) gains and losses recognized on changes in the fair value of contingent consideration arrangements. We believe this measure is useful for analysts and investors as this measure allows a more meaningful comparison between our performance and that of our competitors. The above items are excluded from our Adjusted EBITDA measure because they are non-cash in nature. Adjusted EBITDA has certain limitations because it excludes the impact of these expenses