Acquisitions	12 Months Ended
Acquisitions	Dec. 31, 2021
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions Acquisitions Year Ended December 31, 2021 On June 17, 2021, the Company acquired 100% of the outstanding capital stock of Pulse Q&A Inc. (“Pulse”), a privately-held company based in San Francisco, California, for an aggregate purchase price of $29.1 million. Pulse is a technology-enabled community platform. For cash flow reporting purposes, the Company paid $22.9 million in cash for Pulse after considering the cash acquired with the business, amounts held in escrow and certain other purchase price adjustments. In addition to the purchase price, the Company may also be required to pay up to $4.5 million in cash in the future based on the continuing employment of certain key employees. Such amount will be recognized as compensation expense over three years and reported in Acquisition and integration charges in the Consolidated Statements of Operations. The Company recorded $31.0 million of goodwill and finite-lived intangible assets for Pulse and $1.9 million of liabilities on a net basis. The Company believes that the recorded goodwill is supported by the anticipated synergies resulting from the acquisition. None of the recorded goodwill will be deductible for tax purposes. The fair value measurement of the finite-lived intangible assets was based on income valuation methodologies, primarily an incremental profits approach, which included significant unobservable inputs and thus represented a Level 3 measurement as defined in FASB ASC Topic 820. The allocation of the purchase price is preliminary with respect to certain tax matters. The operating results of the acquired Pulse business and the related goodwill are being reported as part of the Company’s Research segment. The operating results of Pulse have been included in the Company’s consolidated financial statements since the date of acquisition; however, such operating results were not material to the Company’s consolidated operating results and segment results. Had the Company acquired Pulse in prior periods, the impact on the Company’s operating results would not have been material and, as a result, pro forma financial information for prior periods has not been presented herein. Year Ended December 31, 2019 On October 1, 2019, the Company acquired 100% of the outstanding membership interests of TOPO Research LLC (“TOPO”), a privately-held company based in Redwood City, California, for $25.0 million. TOPO was a subscription-based research and advisory business. The acquisition of TOPO expanded the Company’s market presence, product offerings and other business opportunities. For cash flow reporting purposes, the Company paid $23.7 million in cash for TOPO after considering the cash acquired with the business and certain other purchase price adjustments. In addition to the purchase price, the Company paid $6.5 million cash in total to certain key employees based on their continuing employment. Such amount was recognized as compensation expense over two years and reported in Acquisition and integration charges in the Consolidated Statements of Operations. The Company recorded $24.5 million of goodwill and finite-lived intangible assets for TOPO and $0.5 million of other assets on a net basis. The Company believes that the recorded goodwill was supported by the anticipated synergies resulting from the acquisition. All of the recorded goodwill is deductible for tax purposes. The fair value measurement of the finite-lived intangible assets was based on income valuation methodologies, which included significant unobservable inputs and thus represented a Level 3 measurement as defined in FASB ASC Topic 820. The operating results of the acquired TOPO business and the related goodwill are being reported as part of the Company’s Research and Conferences segment. The operating results of TOPO have been included in the Company’s consolidated financial statements since the date of acquisition; however, such operating results were not material to the Company’s consolidated operating results and segment results. Had the Company acquired TOPO in prior periods, the impact on the Company’s operating results would not have been material and, as a result, pro forma financial information for prior periods has not been presented herein. During 2019, the Company also paid $2.3 million of restricted cash for deferred consideration from a 2017 acquisition. Acquisition and Integration Charges The Company recognized $6.1 million, $6.3 million and $9.5 million of Acquisition and integration charges during 2021, 2020 and 2019, respectively. Acquisition and integration charges reflect additional costs and expenses resulting from the Company’s acquisitions and include, among other items, professional fees, severance and stock-based compensation charges. During 2021, the Company received $2.3 million cash proceeds from deferred consideration related to a 2018 divestiture.