(10) Business Combinations Our business acquisitions have historically been made at prices above the fair value of the assets acquired and liabilities assumed, resulting in goodwill, based on our expectations of synergies and other benefits of combining the businesses. These synergies and benefits include elimination of redundant facilities, functions and staffing; use of our existing commercial infrastructure to expand sales of the products of the acquired businesses; and use of the commercial infrastructure of the acquired businesses to expand product sales in a cost-efficient manner. Net assets acquired are recorded at their estimated fair value and are subject to adjustment upon finalization of the fair value analysis. The estimated useful lives of the individual categories of intangible assets were based on the nature of the applicable intangible asset and the expected future cash flows to be derived from the intangible asset. Amortization of intangible assets with finite lives is recognized over the shorter of the respective lives of the agreement or the period of time the intangible assets are expected to contribute to future cash flows. We amortize our finite-lived intangible assets based on patterns on which the respective economic benefits are expected to be realized. Acquisition in 2016 EDTS On February 11, 2016, we acquired the shares of European Drug Testing Services EDTS AB, or EDTS, located in Lidingo, Sweden, a provider of services related to on-site drug testing. The aggregate purchase price was approximately $6.5 million and was paid in cash. The operating results of EDTS are included in our professional diagnostics reporting unit and business segment. Our consolidated statements of operations for the three and six months ended June 30, 2016 included revenue totaling approximately $1.7 million and $2.6 million, respectively, related to this business. Goodwill has been recognized in the acquisition and amounted to approximately $2.1 million, which is deductible for tax purposes. A summary of the