These acquisition-related costs are included in the following categories: (i) transition and integration costs; (ii) professional service fees; and (iii) acquisition-related adjustments. Although these expenses are not recurring with respect to past acquisitions, the Company generally will incur these expenses in connection with any future acquisitions. These categories are further discussed as follows:(i) Transition and integration costs. Transition and integration costs include retention payments, transitional employee costs, earn-out payments treated as compensation expense, as well as the costs of integration-related services provided by third parties. (ii) Professional service fees. Professional service fees include third party costs related to the acquisition, and legal and other professional service fees associated with disputes and regulatory matters related to acquired entities. (iii) Acquisition-related adjustments. Acquisition-related adjustments include adjustments to acquisition-related items that are required to be marked to fair value each reporting period, such as contingent consideration, and other items related to acquisitions for which the measurement period has ended, such as gains or losses on settlements of pre-acquisition contingencies. Amortization of Acquired Intangible Assets. The Company excludes the amortization of acquired intangible assets from non-GAAP expense and income measures. These amounts are inconsistent in amount and frequency and are significantly impacted by the timing and size of acquisitions. Providing a supplemental measure which excludes these charges allows management and investors to evaluate results “as-if” the acquired intangible assets had been developed internally rather than acquired and, therefore, provides a supplemental measure of performance in which the Company’s acquired intellectual property is treated in a comparable manner to its internally developed intellectual property. Although the Company excludes amortization of acquired intangible assets from its non-GAAP expenses, the Company believes that it is important for investors to understand that such intangible assets contribute to revenue generation. Amortization of intangible assets that relate to past acquisitions will recur in future periods until such intangible assets have been fully amortized. Future acquisitions may result in the amortization of additional intangible assets.