Emerald Holding (EEX) 10-Q 3 Nov 22 2022 Q3 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2022	Oct. 31, 2022
Cover [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Sep. 30, 2022
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Trading Symbol	EEX
Entity Registrant Name	Emerald Holding, Inc.
Entity Central Index Key	0001579214
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Shell Company	false
Entity Small Business	false
Entity Emerging Growth Company	true
Entity Ex Transition Period	true
Entity Common Stock, Shares Outstanding		67,609,466
Title of 12(b) Security	Common Stock, par value $0.01 per share
Security Exchange Name	NYSE
Entity File Number	001-38076
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	42-1775077
Entity Address, Address Line One	100 Broadway
Entity Address, Address Line Two	14th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10005
City Area Code	949
Local Phone Number	226-5700
Document Quarterly Report	true
Document Transition Report	false

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current assets
Cash and cash equivalents	$ 366.1	$ 231.2
Trade and other receivables, net of allowances of $1.5 million and $1.2 million as of September 30, 2022 and December 31, 2021, respectively	82.8	46.4
Prepaid expenses and other current assets	18.6	12.5
Total current assets	467.5	290.1
Noncurrent assets
Property and equipment, net	4	3.7
Intangible assets, net	216.7	236.7
Goodwill	545.5	514.2
Right-of-use lease assets	14.5	15.1
Other noncurrent assets	2.6	2.6
Total assets	1,250.8	1,062.4
Current liabilities
Accounts payable and other current liabilities	65	48.3
Income tax payable	28
Cancelled event liabilities	4.4	9.8
Deferred revenues	166.7	118.1
Contingent consideration	28.5	5.1
Right-of-use lease liabilities, current portion	4.9	4.7
Term loan, current portion	5.7	5.7
Total current liabilities	303.2	191.7
Noncurrent liabilities
Term loan, net of discount and deferred financing fees	507.6	510.9
Deferred tax liabilities, net	2	1.5
Right-of-use lease liabilities, noncurrent portion	11.5	13.3
Other noncurrent liabilities	10.2	32.1
Total liabilities	834.5	749.5
Commitments and contingencies (Note 13)
Stockholders’ deficit
Common stock, $0.01 par value; authorized shares at September 30, 2022 and December 31, 2021: 800,000; 67,642 and 70,026 shares issued and outstanding at September 30, 2022 and December 31, 2021, respectively	0.7	0.7
Additional paid-in capital	619.7	653.2
Accumulated deficit	(666.5)	(774.9)
Total stockholders’ deficit	(46.1)	(121)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit	1,250.8	1,062.4
7% Series A Convertible Participating Preferred Stock [Member]
Redeemable convertible preferred stock
7% Series A Redeemable Convertible Participating Preferred stock, $0.01 par value; authorized shares at September 30, 2022 and December 31, 2021: 80,000; 71,417 and 71,442 issued and outstanding; aggregate liquidation preference of $467.7 million and $444.1 million at September 30, 2022 and December 31, 2021, respectively	$ 462.4	$ 433.9

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Allowance - trade and other receivables, current	$ 1.5	$ 1.2
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	800,000,000	800,000,000
Common stock, shares issued	67,642,000	70,026,000
Common stock, shares outstanding	67,642,000	70,026,000
7% Series A Convertible Participating Preferred Stock [Member]
Temporary equity, par value	$ 0.01	$ 0.01
Temporary equity, shares authorized	80,000,000	80,000,000
Temporary equity, shares issued	71,417,000	71,442,000
Temporary equity, share outstanding	71,417,000	71,442,000
Temporary equity, liquidation preference	$ 467.7	$ 444.1

Condensed Consolidated Statemen

Condensed Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) - USD ($) shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenues	$ 62,400,000	$ 76,500,000	$ 232,300,000	$ 104,400,000
Other income, net	151,000,000	1,100,000	182,800,000	17,500,000
Cost of revenues	22,700,000	33,700,000	83,300,000	41,300,000
Selling, general and administrative expense	48,700,000	38,800,000	127,600,000	102,700,000
Depreciation and amortization expense	14,700,000	12,200,000	43,000,000	36,100,000
Goodwill impairment charge	0		6,300,000
Intangible asset impairment charge			1,600,000
Operating income (loss)	127,300,000	(7,100,000)	153,300,000	(58,200,000)
Interest expense	6,800,000	3,900,000	15,500,000	12,000,000
Interest income	800,000		1,100,000	100,000
Other expense	100,000		200,000	100,000
Income (loss) before income taxes	121,200,000	(11,000,000)	138,700,000	(70,200,000)
Provision for (benefit from) income taxes	28,200,000	(2,000,000)	30,300,000	600,000
Net income (loss) and comprehensive income (loss)	93,000,000	(9,000,000)	108,400,000	(70,800,000)
Accretion to redemption value of redeemable convertible preferred stock	(9,900,000)	(9,000,000)	(28,700,000)	(26,300,000)
Participation rights on if-converted basis	(54,700,000)		(51,900,000)
Net income (loss) and comprehensive income (loss) attributable to Emerald Holding, Inc. common stockholders	$ 28,400,000	$ (18,000,000)	$ 27,800,000	$ (97,100,000)
Basic income (loss) per share	$ 0.42	$ (0.25)	$ 0.40	$ (1.35)
Diluted income (loss) per share	$ 0.41	$ (0.25)	$ 0.40	$ (1.35)
Basic weighted average common shares outstanding	68,433	71,033	69,479	71,719
Diluted weighted average common shares outstanding	68,643	71,033	69,588	71,719

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and of Stockholders' Equity (Deficit) - USD ($) shares in Thousands, $ in Millions	Total	Redeemable Convertible Preferred Stock [Member]	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Deficit [Member]
Balance at Dec. 31, 2020	$ (3.8)		$ 0.7	$ 690.7	$ (695.2)
Temporary Equity, Balance, shares at Dec. 31, 2020		71,445
Temporary Equity, Balance at Dec. 31, 2020		$ 398.3
Balance, shares at Dec. 31, 2020			72,195
Stock-based compensation	8.1			8.1
Stock-based compensation, shares			281
Issuance of common stock under equity plans, shares			42
Accretion to redemption value of redeemable convertible preferred stock	(26.3)			(26.3)
Temporary Equity, Accretion to redemption value of redeemable convertible preferred stock		$ 26.3
Repurchase of common stock	(10.7)			(10.7)
Repurchase of common stock, shares			(2,123)
Temporary Equity, Redeemable convertible preferred stock conversion, shares		(3)
Redeemable convertible preferred stock conversion, shares			5
Net income (loss) and comprehensive income (loss)	(70.8)				(70.8)
Balances at Sep. 30, 2021	(103.5)		$ 0.7	661.8	(766)
Temporary Equity, Balance, shares at Sep. 30, 2021		71,442
Temporary Equity, Balance at Sep. 30, 2021		$ 424.6
Balance, shares at Sep. 30, 2021			70,400
Balance at Dec. 31, 2020	(3.8)		$ 0.7	690.7	(695.2)
Temporary Equity, Balance, shares at Dec. 31, 2020		71,445
Temporary Equity, Balance at Dec. 31, 2020		$ 398.3
Balance, shares at Dec. 31, 2020			72,195
Net income (loss) and comprehensive income (loss)	(79.7)
Balances at Dec. 31, 2021	(121)		$ 0.7	653.2	(774.9)
Temporary Equity, Balance, shares at Dec. 31, 2021		71,442
Temporary Equity, Balance at Dec. 31, 2021		$ 433.9
Balance, shares at Dec. 31, 2021			70,026
Balance at Jun. 30, 2021	(82.4)		$ 0.7	673.9	(757)
Temporary Equity, Balance, shares at Jun. 30, 2021		71,442
Temporary Equity, Balance at Jun. 30, 2021		$ 415.6
Balance, shares at Jun. 30, 2021			71,518
Stock-based compensation	2.5			2.5
Stock-based compensation, shares			55
Issuance of common stock under equity plans, shares			20
Accretion to redemption value of redeemable convertible preferred stock	(9)			(9)
Temporary Equity, Accretion to redemption value of redeemable convertible preferred stock		$ 9
Repurchase of common stock	(5.6)			(5.6)
Repurchase of common stock, shares			(1,193)
Net income (loss) and comprehensive income (loss)	(9)				(9)
Balances at Sep. 30, 2021	(103.5)		$ 0.7	661.8	(766)
Temporary Equity, Balance, shares at Sep. 30, 2021		71,442
Temporary Equity, Balance at Sep. 30, 2021		$ 424.6
Balance, shares at Sep. 30, 2021			70,400
Balance at Dec. 31, 2021	(121)		$ 0.7	653.2	(774.9)
Temporary Equity, Balance, shares at Dec. 31, 2021		71,442
Temporary Equity, Balance at Dec. 31, 2021		$ 433.9
Balance, shares at Dec. 31, 2021			70,026
Stock-based compensation	5.1			5.1
Stock-based compensation, shares			361
Issuance of common stock under equity plans, shares			37
Accretion to redemption value of redeemable convertible preferred stock	(28.7)			(28.7)
Temporary Equity, Accretion to redemption value of redeemable convertible preferred stock		28.7
Repurchase of common stock	(10.1)			(10.1)
Repurchase of common stock, shares			(2,828)
Temporary Equity Redeemable convertible preferred stock conversion		$ (0.2)
Temporary Equity, Redeemable convertible preferred stock conversion, shares		(25)
Redeemable convertible preferred stock conversion	0.2			0.2
Redeemable convertible preferred stock conversion, shares			46
Net income (loss) and comprehensive income (loss)	108.4				108.4
Balances at Sep. 30, 2022	(46.1)		$ 0.7	619.7	(666.5)
Temporary Equity, Balance, shares at Sep. 30, 2022		71,417
Temporary Equity, Balance at Sep. 30, 2022		$ 462.4
Balance, shares at Sep. 30, 2022			67,642
Balance at Jun. 30, 2022	(124.8)		$ 0.7	634	(759.5)
Temporary Equity, Balance, shares at Jun. 30, 2022		71,417
Temporary Equity, Balance at Jun. 30, 2022		$ 452.5
Balance, shares at Jun. 30, 2022			69,284
Stock-based compensation	1.4			1.4
Stock-based compensation, shares			16
Issuance of common stock under equity plans, shares			17
Accretion to redemption value of redeemable convertible preferred stock	(9.9)			(9.9)
Temporary Equity, Accretion to redemption value of redeemable convertible preferred stock		$ 9.9
Repurchase of common stock	(5.8)			(5.8)
Repurchase of common stock, shares			(1,676)
Redeemable convertible preferred stock conversion, shares			1
Net income (loss) and comprehensive income (loss)	93				93
Balances at Sep. 30, 2022	$ (46.1)		$ 0.7	$ 619.7	$ (666.5)
Temporary Equity, Balance, shares at Sep. 30, 2022		71,417
Temporary Equity, Balance at Sep. 30, 2022		$ 462.4
Balance, shares at Sep. 30, 2022			67,642

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Operating activities
Net income (loss)				$ 108,400,000	$ (70,800,000)	$ (79,700,000)
Adjustments to reconcile net loss to net cash provided by operating activities:
Stock-based compensation expense	$ 1,300,000		$ 2,400,000	5,000,000	8,200,000
Provision for credit losses				300,000	200,000
Depreciation and amortization	14,700,000		12,200,000	43,000,000	36,100,000
Goodwill impairment	0	$ 6,300,000		6,300,000
Intangible asset impairment charge				1,600,000
Non-cash operating lease expense				2,500,000	2,400,000
Amortization of deferred financing fees and debt discount	300,000		300,000	1,000,000	1,100,000
Remeasurement of contingent consideration				(9,300,000)	2,600,000
Deferred income taxes				500,000	400,000
Loss on disposal of property and equipment				100,000
Changes in operating assets and liabilities:
Trade and other receivables				(32,800,000)	(8,300,000)
Insurance receivables					17,800,000
Prepaid expenses and other current assets				(6,500,000)	(600,000)
Other noncurrent assets				(100,000)	300,000
Accounts payable and other current liabilities				14,300,000	21,600,000	20,800,000
Cancelled event liabilities				(5,400,000)	(4,300,000)
Contingent consideration				(2,100,000)
Income tax payable				28,500,000	300,000
Deferred revenues				45,500,000	33,800,000
Operating lease liabilities				(3,600,000)	(1,800,000)
Other noncurrent liabilities				1,500,000	(2,700,000)
Net cash provided by operating activities				198,700,000	36,300,000	90,000,000
Investing activities
Acquisition of businesses				(37,600,000)	(7,000,000)
Purchase of marketable securities				(50,000,000)
Proceeds from maturity of marketable securities	50,000,000			50,000,000
Purchases of property and equipment				(1,500,000)	(1,000,000)
Purchases of intangible assets				(6,000,000)	(3,100,000)
Net cash used in investing activities				(45,100,000)	(11,100,000)
Financing activities
Payment of deferred consideration for acquisition of businesses					(2,000,000)
Payment of contingent consideration for acquisition of businesses				(4,400,000)
Repayment of principal on term loan				(4,200,000)	(4,200,000)
Fees paid for revolving credit facility extension					(100,000)
Repurchase of common stock				(10,200,000)	(10,700,000)
Proceeds from issuance of common stock under equity plans				100,000	100,000
Net cash used in financing activities				(18,700,000)	(16,900,000)
Net increase in cash and cash equivalents				134,900,000	8,300,000
Cash and cash equivalents
Beginning of period		$ 231,200,000		231,200,000	295,300,000	295,300,000
End of period	$ 366,100,000		$ 303,600,000	$ 366,100,000	$ 303,600,000	$ 231,200,000

Basis of Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Basis of Presentation	1. Basis of Presentation The unaudited condensed consolidated financial statements include the operations of Emerald Holding, Inc. (the “Company” or “Emerald”) and its wholly-owned subsidiaries. These unaudited condensed consolidated financial statements are presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the SEC for Interim Reporting. All intercompany transactions, accounts and profits/losses, if any, have been eliminated in the unaudited condensed consolidated financial statements. In the opinion of management, all recurring adjustments considered necessary for a fair statement of results for the interim period have been included. These unaudited condensed consolidated financial statements do not include all disclosures required by GAAP, therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the more detailed audited consolidated financial statements for the year ended December 31, 2021. The December 31, 2021 condensed consolidated balance sheet was derived from the Company’s audited consolidated financial statements for the year ended December 31, 2021. The results for the three and nine months ended September 30, 2022 are not necessarily indicative of results to be expected for a full year, any other interim periods or any future year or period. Results of our reportable segments for the three and nine months ended September 30, 2022 reflect the updated segment presentation discussed below in Note 15 “ Segment Information ”. Revision of Previously Issued Financial Statements In conjunction with the Company’s close process for the second quarter of 2022, management identified an immaterial error relating to a payment due to a third party as a result of the Company’s recognition of insurance claim proceeds associated with a cancelled event in 2021 as a result of COVID-19. Management determined that upon recognition of the insurance proceeds during December of 2021, the Company did not appropriately record a liability in the amount of $ 1.6 million, representing the portion of the insurance proceeds that were payable to the third party. The failure to accrue this payment due to the third party resulted in Cost of revenues and Accounts payable and other current liabilities being understated by $ 1.6 million. Management evaluated the impact of this error on the Company’s Q4 and full year 2021 consolidated financial statements and determined that the consolidated financial statements were not materially misstated. However, in order to correctly state equity, the December 31, 2021 stockholders’ deficit has been corrected to reflect the impact of this immaterial error. The Company will revise its consolidated financial statements as of and for the year ended December 31, 2021 when it files its Form 10-K for the period ended December 31, 2022. The following tables reflect the impact of the revision to the specific line items presented in the Company’s previously reported consolidated financial statements as of and for the year ended December 31, 2021 (dollars in millions, share data in thousands except earnings per share and share par value): Consolidated Balance Sheet December 31, 2021 (dollars in millions, share data in thousands, except par value) As Originally Adjustments As Revised Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Deficit Current liabilities Accounts payable and other current liabilities $ 46.7 $ 1.6 $ 48.3 Total current liabilities 190.1 1.6 191.7 Total liabilities 747.9 1.6 749.5 Accumulated deficit ( 773.3 ) ( 1.6 ) ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Total liabilities, redeemable convertible preferred $ 1,062.4 — $ 1,062.4 Year ended December 31, 2021 Consolidated Statements of Income (Loss) and As Originally Adjustments As Revised (dollars in millions, share data in thousands except earnings per share) Cost of revenues 55.5 1.6 57.1 Operating loss ( 63.1 ) ( 1.6 ) ( 64.7 ) Loss before income taxes ( 79.4 ) ( 1.6 ) ( 81.0 ) Net loss and comprehensive loss ( 78.1 ) ( 1.6 ) ( 79.7 ) Net loss and comprehensive loss attributable $ ( 113.7 ) $ ( 1.6 ) $ ( 115.3 ) Basic loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Diluted loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Basic weighted average common shares outstanding 71,309 71,309 71,309 Diluted weighted average common shares outstanding 71,309 71,309 71,309 Year ended December 31, 2021 Consolidated Statement of Redeemable Convertible As Originally Adjustments As Revised (in millions) Net loss and comprehensive loss attributable to: Accumulated deficit $ ( 773.3 ) $ ( 1.6 ) $ ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Consolidated Statement of Cash Flows Year ended December 31, 2021 (in millions) As Originally Adjustments As Revised Operating activities Net loss $ ( 78.1 ) $ ( 1.6 ) $ ( 79.7 ) Changes in operating assets and liabilities: Accounts payable and other current liabilities 19.2 1.6 20.8 Net cash provided by operating activities 90.0 — 90.0 There was no impact on cash flows from investing or financing activities. The accompanying applicable Notes have been updated to reflect the revision for the year ended December 31, 2021. Liquidity Position and Management’s Plan The unprecedented and rapid spread of COVID-19 and the related government restrictions and social distancing measures implemented in the United States and throughout the world significantly impacted Emerald’s business from mid-March 2020 through the end of fiscal year 2021. Late in the second quarter of 2021, management began to see positive impacts of successful vaccination rollouts in many countries, with social distancing restrictions easing and live events resuming in the United States. In the second half of 2021, Emerald’s live events business experienced a meaningful restart with the successful execution of 56 in-person events, serving more than 129,000 attendees and 7,500 exhibiting companies. The Company began 2022 planning to stage a full slate of events and successfully traded 84 in-person events during the first nine months of the year, serving approximately 282,300 attendees and 13,300 exhibiting companies. While the Company has been able to resume its full schedule of events in 2022, the ongoing effects of COVID-19 on the Company’s operations have had, and will continue to have, a negative impact on its financial results and liquidity. The assumptions used to estimate the Company’s liquidity are subject to greater uncertainty because the Company has never previously cancelled or postponed all upcoming events for a period of over a year due to a pandemic. Management cannot estimate with certainty when event exhibitors and attendees will attend the Company’s events in numbers similar to pre-pandemic editions now that our events have fully resumed. Therefore, current estimates of revenues and the associated impact on liquidity could differ significantly in the future. On August 3, 2022, the Company reached an agreement to settle outstanding insurance litigation relating to event cancellation insurance for proceeds of $ 148.6 million. During the three and nine months ended September 30, 2022, the Company recorded other income, net of $ 151.0 million and $ 182.8 million , respectively, related to event cancellation insurance claim and settlement proceeds deemed to be realizable by management. All of the other income, net for the first nine months of 2022 was received during the period. During each of the three and nine months ended September 30, 2021, the Company recorded other income, net of $ 1.1 million and $ 17.5 million , respectively, related to event cancellation insurance claim proceeds deemed to be realizable by management. All of the other income, net for the first nine months of 2021 was received during the period. Emerald’s renewed event cancellation insurance policies for the year 2022 do not cover losses due to event cancellations caused by the outbreak of communicable diseases, including COVID-19. The aggregate limit for the Company’s renewed 2022 primary event cancellation insurance policy is $ 100.0 million. The Company also obtained a similar separate event cancellation insurance policy for the Surf Expo Winter 2022 and Surf Expo Summer 2022 shows, with a coverage limit of $ 8.4 million and $ 6.5 million for each respective event. As of September 30, 2022 , the Company had $ 515.3 million of borrowings outstanding under the Amended and Restated Term Loan Facility and no borrowings outstanding under the Revolving Credit Facility. In addition, as of September 30, 2022, the Company had cash and cash equivalents of $ 366.1 million . As of September 30, 2022, the Company was in compliance with the covenants contained in the Amended and Restated Senior Secured Credit Facilities. Based on the Company's return to positive operating cash flows, current cash position and assumptions regarding the impact of COVID-19, management believes that the Company’s current financial resources will be sufficient to fund its liquidity requirements for the next twelve months. Use of Estimates and Judgments The preparation of financial statements in conformity with GAAP requires management to make estimates and judgments that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, the Company evaluates its estimates and judgments compared to historical experience and expected trends. The COVID-19 pandemic and related effects are dynamic and ongoing, and the Company has considered its impact when developing its estimates and assumptions. Actual results and outcomes may differ from management's estimates and assumptions. Marketable Securities The Company received $ 50.0 million in proceeds from the maturity of its marketable securities during the three months ended September 30, 2022 and no longer held any marketable securities as of September 30, 2022. Therefore, there were no unrealized holding gains or losses during the period. The Company has in the past held, and may from time to time hold marketable securities that consisting of certificates of deposit with financial institutions with maturities over three months and up to one year. These have historically been classified as marketable debt securities as their underlying investments primarily consist of corporate debt securities. These certificates of deposits have readily ascertainable values as they can be readily purchased or sold using established markets. These investments were classified as available-for-sale and were reported at fair value on the Company's condensed consolidated balance sheets. Unrealized holding gains and losses were immaterial for the three and nine months ended September 30, 2022 and are reported within accumulated other comprehensive income in the Company's condensed consolidated statements of stockholders’ equity (deficit). Fair value was based on available market information including quoted broker or dealer quotations, or other observable inputs. The Company did no t hold any marketable securities at September 30, 2021 therefore, there were no unrealized holding gains or losses. The Company invests its marketable securities in high-quality commercial financial instruments. The Company believes it is not exposed to significant credit risk on its marketable securities. Segment Reporting Operating segments are components of an enterprise for which discrete financial reporting information is available that is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. Emerald’s Chief Executive Officer (“CEO”) was appointed in January 2021 and is considered the CODM. Effective January 31, 2022, Emerald’s CEO changed the way that he evaluates the results of the Company’s operations and as a result, there was a change in reporting segments. The CODM evaluates performance based on the results of seven executive portfolios, which represent the Company’s seven operating segments. Based on an evaluation of economic similarities, five operating segments are aggregated into two reportable segments: "Commerce" and "Design, Creative and Technology" reportable segments. Two operating segments do not meet the quantitative thresholds of a reportable operating segment and did not meet the aggregation criteria set forth in Accounting Standards Codification 280 (“ASC 280”), Segment Reporting, as of September 30, 2022 and as such are referred to as “All Other.” Refer to Note 15, Segment Information , for information regarding the Company’s reportable segments.

Recent Accounting Pronouncement

Recent Accounting Pronouncements	9 Months Ended
	Sep. 30, 2022
Accounting Changes And Error Corrections [Abstract]
Recent Accounting Pronouncements	2. Recent Accounting Pronouncements Recently Adopted Accounting Pronouncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard (“ASU”) 2021-08 (“ASU 2021-08”), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, creating an exception to the recognition and measurement principles in ASC 805, Business Combinations. The amendments require an acquirer to use the guidance in ASC 606, Revenue from Contracts with Customers, rather than using fair value, when recognizing and measuring contract assets and contract liabilities related to customer contracts assumed in a business combination. This guidance is effective for fiscal years beginning after December 15, 2022, and for interim periods within that year. Early adoption is permitted and the amendments in ASU 2021-08 should be applied to business combinations occurring during the year of adoption. The Company adopted ASU 2021-08 in October 2021 and the adoption did no t have a material impact on the Company’s consolidated financial statements. In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions and adding further guidance to simplify the accounting for income taxes. The standard removes certain exceptions related to intra-period tax allocations, the methodology for calculating income taxes in interim periods and the recognition of deferred taxes for investments. The standard also clarifies and amends existing guidance to reduce complexity in certain areas, including recognizing deferred taxes for tax goodwill and allocating taxes to members of a consolidated group. The Company adopted ASU 2019-12 on January 1, 2021 , which did no t have a material impact on the Company’s condensed consolidated financial statements. Recently Issued Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden of accounting for (or recognizing the effects of) reference rate reform. The amendments in ASU 2020-04 are effective upon issuance through December 31, 2022 and may be applied prospectively to contract modifications made and hedging relationships entered into on or before December 31, 2022. The Company does not expect the adoption of this accounting standard will have a material impact on the Company’s condensed consolidated financial statements. There have been no other new accounting pronouncements that are expected to have a significant impact on the Company’s condensed consolidated financial statements or notes thereto.

Revenues

Revenues	9 Months Ended
	Sep. 30, 2022
Revenue From Contract With Customer [Abstract]
Revenues	3. Revenues Impact of COVID-19 The global COVID-19 pandemic significantly impacted the Company’s revenues from mid-March 2020 through the end of fiscal year 2021. Late in the second quarter of 2021, the Company began to see the positive impacts of successful vaccination rollouts throughout the United States, with social distancing restrictions easing and live events resuming. As a result, the Company was able to hold 84 in-person events during the first nine months of 2022. Revenue Recognition and Deferred Revenue Revenue is recognized as the customer receives the benefit of the promised services and performance obligations are satisfied. Revenue is recognized at an amount that reflects the consideration the Company expects to receive in exchange for those services. Customers generally receive the benefit of the Company’s services upon the staging of each trade show or conference event and over the subscription period for access to the Company’s subscription software and services. A significant portion of the Company’s annual revenue is generated from the production of trade shows and other events, including booth space sales, registration fees and sponsorship fees. Trade show revenues and other events represented 79.8 % and 85.4 % of total revenues for the three months ended September 30, 2022 and 2021, respectively. Trade show and other event revenues represented 84.9 % and 71.6 % of total revenues for the nine months ended September 30, 2022 and 2021, respectively. Deferred revenues generally consist of booth space sales, registration fees and sponsorship fees that are invoiced prior to a trade show, as well as upfront payments for software subscription fees, professional services and implementation fees for the Company’s subscription software and services. Current deferred revenues were $ 166.7 million as of September 30, 2022 and are reported as deferred revenues on the condensed consolidated balance sheets. Long-term deferred revenues as of September 30, 2022 were $ 1.7 million and are reported as other noncurrent liabilities on the condensed consolidated balance sheets. Current and long-term deferred revenues as of December 31, 2021 were $ 118.1 million and $ 0.2 million, respectively. During the three and nine months ended September 30, 2022 , the Company recognized revenues of $ 54.5 million and $ 198.4 million, respectively, from amounts included in deferred revenue at the beginning of the respective period. During the three and nine months ended September 30, 2021 , the Company recognized revenues of $ 76.7 million and $ 91.4 million, respectively, from amounts included in deferred revenue at the beginning of the respective period. The accounts receivable and deferred revenue balances related to cancelled events have been reclassified to cancelled event liabilities in the condensed consolidated balance sheets as the total amount represents balances which are expected to be refunded to customers. As of September 30, 2022, cancelled event liabilities of $ 4.4 million represents $ 3.2 million of deferred revenues for cancelled trade shows and $ 1.2 million of related accounts receivable reclassified to cancelled event liabilities in the condensed consolidated balance sheets. As of December 31, 2021, cancelled event liabilities of $ 9.8 million represents $ 5.6 million of deferred revenues for cancelled trade shows and $ 4.2 million of related accounts receivable reclassified to cancelled event liabilities in the condensed consolidated balance sheets. Performance Obligations For the Company’s trade shows and other events, sales are deferred and recognized when performance obligations under the terms of a contract with the Company’s customers are satisfied, which is typically at the completion of a show or event. Revenue is measured as the amount of consideration the Company expects to receive upon completion of its performance obligations. For the Company’s subscription software and services, the Company enters into contracts with customers that often include multiple performance obligations, which are generally capable of being distinct. Fees associated with implementation and professional services are deferred and recognized over the expected customer life, which is four years . Subscription revenue is generally recognized over the term of the contract. The Company’s contracts associated with the subscription software and services are typically three-year terms with one-year renewals following the initial three-year term. For the Company’s other marketing services, revenues are deferred and recognized when performance obligations under the terms of a contract with the Company’s customers are satisfied. This generally occurs in the period in which the publications are issued. Revenue is measured as the amount of consideration the Company expects to receive upon completion of its performance obligations. The Company applies a practical expedient which allows the exclusion of disclosure information regarding remaining performance obligations if the performance obligation is part of a contract that has an expected duration of one year or less. The Company’s performance obligations greater than one year are immaterial. Disaggregation of Revenue The Company’s primary sources of revenue are from trade shows, other events, subscription software and services and other marketing services. The following table represents revenues disaggregated by type: Reportable Segment Commerce (1) Design, (1) All Other (1) Total Three Months Ended September 30, 2022 (in millions) Trade shows $ 32.1 $ 4.6 $ 0.9 $ 37.6 Other events 0.1 11.3 0.8 12.2 Subscription software and services 0.1 0.7 3.8 4.6 Other marketing services 1.6 6.4 — 8.0 Total revenues $ 33.9 $ 23.0 $ 5.5 $ 62.4 Three Months Ended September 30, 2021 Trade shows $ 37.3 $ 19.1 $ — $ 56.4 Other events 0.2 8.7 — 8.9 Subscription software and services — 0.8 2.9 3.7 Other marketing services 1.3 6.2 — 7.5 Total revenues $ 38.8 $ 34.8 $ 2.9 $ 76.5 Nine Months Ended September 30, 2022 Trade shows $ 104.3 $ 60.0 $ 2.4 $ 166.7 Other events 0.6 29.2 0.8 30.6 Subscription software and services 0.1 2.3 10.7 13.1 Other marketing services 5.3 16.6 — 21.9 Total revenues $ 110.3 $ 108.1 $ 13.9 $ 232.3 Nine Months Ended September 30, 2021 Trade shows $ 42.9 $ 19.1 $ — $ 62.0 Other events 1.7 11.1 — 12.8 Subscription software and services — 1.3 8.1 9.4 Other marketing services 3.7 16.5 — 20.2 Total revenues $ 48.3 $ 48.0 $ 8.1 $ 104.4 (1) Current year segment disclosures reflect the new reportable segment structure Contract Balances The Company’s contract assets are primarily sales commissions incurred in connection with the Company’s subscription software and services, which are expensed over the expected customer relationship period. As of September 30, 2022, the Company does not have material contract assets. Contract liabilities generally consist of booth space sales, registration fees, sponsorship fees that are collected prior to the trade show or other event and subscription revenue, implementation fees and professional services associated with the Company’s subscription software and services. Contract liabilities less than one year from the date of the performance obligation are reported on the condensed consolidated balance sheets as deferred revenues. Contract liabilities greater than one year from the date of the performance obligation are reported on the condensed consolidated balance sheets in other noncurrent liabilities. The Company’s sales commission costs incurred in connection with sales of booth space, registration fees and sponsorship fees at the Company’s trade shows and other events and with sales of advertising for industry publications are generally short term, as sales typically begin up to one year prior to the date of the trade shows and other events. The Company expects the period benefited by each commission to be less than one year , and as a result, the Company expenses sales commissions associated with trade shows, other events and other marketing services as incurred. Sales commissions are reported on the condensed consolidated statements of income (loss) and comprehensive income (loss) as selling, general and administrative expense. Accounts Receivable The Company monitors collections and payments from its customers and maintains an allowance based upon applying an expected credit loss rate to receivables based on the historical loss rate from similar higher risk customers adjusted for current conditions, including any specific customer collection issues identified, and forecasts of economic conditions. Delinquent account balances are written off after management has determined that the likelihood of collection is remote. The activities in this account, including the current-period provision for expected credit losses for the three and nine months ended September 30, 2022 and 2021 , were not material.

Business Acquisitions

Business Acquisitions	9 Months Ended
	Sep. 30, 2022
Business Combinations [Abstract]
Business Acquisition	4. Business Acquisitions 2022 Acquisition Bulletin, Inc. ("Bulletin") In furtherance of the Company’s strategy to combine both in-person and e-commerce offerings, the Company executed an asset purchase agreement on July 11, 2022 to acquire certain assets and assume certain liabilities of the business known as Bulletin for a total estimated purchase price of $ 9.9 million, which included an initial cash payment of $ 8.9 million and contingent consideration with an estimated fair value of $ 1.0 million. The contingent consideration liability related to the acquisition of Bulletin of $ 1.0 million, consists of a potential payment based on the 2026 Bulletin EBITDA. The 2026 payment is expected to be settled in the second quarter of 2027. Bulletin is an online wholesale market for retail where brands, buyers and designers gather to connect and discover new products. The Company believes this acquisition will infuse the NY NOW Gift and Home Show with Bulletin’s industry expertise and extensive customer base of brands and retailers. The acquisition was financed with cash from operations. The preparation of the valuation required the use of significant assumptions and estimates. Critical estimates included, but were not limited to, future expected cash flows, including projected revenues and expenses, royalty rate and the applicable discount rates. These estimates were based on assumptions that the Company believes to be reasonable, however, actual results may differ from these estimates. External acquisition costs of $ 1.1 million were expensed as incurred and included in selling, general and administrative expenses in the condensed consolidated statements of income (loss) and comprehensive income (loss). Goodwill was calculated as the excess of the purchase price over the estimated fair values of acquired assets and intangible assets acquired offset by liabilities acquired and is primarily attributable to the future economic benefits expected to arise from synergies expected to arise due to certain cost savings, operating efficiencies and other strategic benefits. Substantially all of the goodwill recorded is expected to be deductible for income tax purposes. The primary tasks that are required to be completed to finalize the valuation of assets and liabilities acquired include validation of business level forecasts, customer attrition rates and acquired working capital balances. Identified intangible assets associated with Bulletin included acquired technology and trade name intangible assets of $ 2.0 million and $ 0.1 million, respectively. The weighted-average amortization period of the acquired technology was 3.0 years. The weighted-average amortization period of the trade name intangible assets acquired was 3.0 years. There is no assumed residual value for the acquired technology and trade name intangible assets. The following table summarizes the preliminary fair value of the acquired assets and liabilities on the acquisition date: (in millions) July 11, Trade receivables and prepaid expenses $ 0.4 Goodwill 7.9 Intangible assets 2.1 Accounts payable and other current liabilities ( 0.5 ) Purchase price $ 9.9 Advertising Week In furtherance of the Company’s strategy to provide year-round engagement and optimize its portfolio within strategic growth industries, the Company executed an asset purchase agreement on June 21, 2022 to acquire all the assets and assume certain liabilities of the business known as Advertising Week from Stillwell Partners for a total estimated purchase price of $ 34.3 million, which included an initial cash payment of $ 28.4 million and contingent consideration with an estimated fair value of $ 5.9 million. Advertising Week is a global event and thought leadership platform focused on marketing, media, technology, and culture. The acquisition was financed with cash from operations. The preparation of the valuation required the use of significant assumptions and estimates. Critical estimates included, but were not limited to, future expected cash flows, including projected revenues and expenses, and the applicable discount rates. These estimates were based on assumptions that the Company believes to be reasonable, however, actual results may differ from these estimates. Identified intangible assets associated with Advertising Week included trade name, customer relationship and content intangible assets of $ 5.4 million, $ 5.9 million and $ 1.1 million, respectively. The weighted-average amortization period of the trade names acquired was 15.0 years. The weighted-average amortization period of the customer relationship intangible assets acquired was 10.0 years, based on the expected pattern of economic benefit used to calculate their fair value. The weighted-average amortization period of the content intangible assets acquired was 7.0 years. There is no assumed residual value for the acquired content, trade names, customer relationships. The contingent consideration liability related to the acquisition of Advertising Week in the amount of $ 5.9 million as of the acquisition date, consists of two potential payments, the 2023 payment and the 2026 payment. The 2023 payment is based on a multiple of 2023 EBITDA growth from a specified EBITDA target and will be settled in the second quarter of 2024. The 2026 payment is based on a range of multiples, which are dependent upon the acquisition’s 5 -year compounded annual EBITDA growth rate from 2021 through 2026, being applied to the average annual EBITDA growth in calendar years 2024, 2025 and 2026, from a specified EBITDA target, less the 2023 payment. The 2026 payment will be settled in the second quarter of 2027. The 2023 and 2026 payments are not capped as they are based on increases in EBITDA. Therefore, there is no pre-determined upper limit to the undiscounted range. External acquisition costs of $ 0.6 million were expensed as incurred and included in selling, general and administrative expenses in the condensed consolidated statements of income (loss) and comprehensive income (loss). Goodwill was calculated as the excess of the purchase price over the estimated fair values of acquired assets and intangible assets acquired offset by liabilities acquired and is primarily attributable to the future economic benefits expected to arise from synergies expected to arise due to certain cost savings, operating efficiencies and other strategic benefits. Substantially all of the goodwill recorded is expected to be deductible for income tax purposes. The primary tasks that are required to be completed include validation of business level forecasts, customer attrition rates and acquired working capital balances. The following table summarizes the preliminary fair value of the acquired assets and liabilities on the acquisition date: (in millions) June 21, Trade and other receivables $ 3.8 Prepaid expenses and other current assets 0.3 Goodwill 23.6 Intangible assets 12.4 Right-of-use lease asset 1.2 Accounts payable and other current liabilities ( 2.7 ) Deferred revenues ( 3.1 ) Right-of-use lease liability ( 1.2 ) Purchase price $ 34.3 2021 Acquisition MJBiz During the three months ended March 31, 2022, the Company finalized its analysis of the purchase accounting, including gaining a better understanding of historical MJBizCon registration revenue and its impact on the valuation model. The final analysis of the registration revenue and the associated revision to the average EBITDA growth estimate for MJBiz resulted in an $ 8.9 million increase in the estimated contingent consideration liability. The measurement period closed in the first quarter of 2022. The Company’s purchase price allocation and measurement period adjustment for the MJBiz acquisition is presented below: (in millions) Fair Value Non-Cash (1) Fair Value Trade and other receivables $ 0.6 $ — $ 0.6 Prepaid expenses 0.1 — 0.1 Goodwill 113.8 6.0 119.8 Intangible Assets 30.4 2.9 33.3 Deferred Revenues ( 1.3 ) — ( 1.3 ) Other current liabilities ( 1.4 ) — ( 1.4 ) Purchase price $ 142.2 $ 8.9 $ 151.1 (1) During the first quarter of 2022, the Company recorded a non-cash adjustment to reflect a measurement period adjustment. Upon finalizing the analysis of the average EBITDA growth estimate, including gaining a better understanding of historical MJBizCon registration revenue trends, the estimated contingent consideration liability increased by $ 8.9 million, from approximately $ 24.0 million to $ 32.9 million. Such change resulted in an increase to Goodwill of $ 6.0 million and an increase in Intangible Assets of $ 2.9 million in the Commerce reportable segment. Supplemental Pro-Forma Information Supplemental information on an unaudited pro-forma basis, is reflected as if each of the 2022 acquisitions had occurred at the beginning of 2021, after giving effect to certain pro-forma adjustments primarily related to the amortization of acquired intangible assets and interest expense. The unaudited pro-forma supplemental information is based on estimates and assumptions that the Company believes are reasonable and reflects amortization of intangible assets as a result of the acquisitions. The supplemental unaudited pro-forma financial information is presented for comparative purposes only. It is not necessarily indicative of what the Company’s financial position or results of operations actually would have been had the Company completed the acquisitions at the dates indicated, nor is it intended to project the future financial position or operating results of the combined Company. Further, the supplemental pro-forma information has not been adjusted for show timing differences or discontinued events. Three Months Ended Nine Months Ended 2022 2022 (in millions) (Unaudited) Pro-forma revenues (1) Advertising Week $ — $ 5.5 Emerald revenue 62.4 232.3 Total pro-forma revenues $ 62.4 $ 237.8 Pro-forma net income Advertising Week $ — $ ( 0.7 ) Bulletin — ( 2.1 ) Emerald net income 93.0 108.4 Total pro-forma net income $ 93.0 $ 105.6 (1) Pro-forma revenues from the Bulletin acquisition were not material to the three and nine months ended September 30, 2022. Three Months Ended Nine Months Ended 2021 2021 (in millions) (Unaudited) Pro-forma revenues (1) Advertising Week $ 0.2 $ 3.0 MJBiz 0.7 1.8 Sue Bryce Education and The Portrait Masters — 1.0 Emerald revenue 76.5 104.4 Total pro-forma revenues $ 77.4 $ 110.2 Pro-forma net (loss) income Advertising Week $ ( 0.7 ) $ ( 1.0 ) Bulletin ( 1.3 ) ( 2.4 ) MJBiz ( 3.5 ) ( 10.6 ) Sue Bryce Education and The Portrait Masters — 0.3 Emerald net loss ( 9.0 ) ( 70.8 ) Total pro-forma net loss $ ( 14.5 ) $ ( 84.5 ) (1) Pro-forma revenues from the Bulletin acquisition were not material to the three and nine months ended September 30, 2021.

Property and Equipment

Property and Equipment	9 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Property and Equipment	5. Property and Equipment Property and equipment, net, consisted of the following: (in millions) September 30, December 31, Furniture, equipment and other $ 8.0 $ 6.5 Leasehold improvements 3.2 3.1 11.2 9.6 Less: Accumulated depreciation ( 7.2 ) ( 5.9 ) Property and equipment, net $ 4.0 $ 3.7 Depreciation expense related to property and equipment for the three and nine months ended September 30, 2022 was $ 0.7 million and $ 1.3 million , respectively. Depreciation expense related to property and equipment for the three and nine months ended September 30, 2021 was $ 0.4 million and $ 1.0 million, respectively.

Intangible Assets and Goodwill

Intangible Assets and Goodwill	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Intangible Assets and Goodwill	6. Intangible Assets and Goodwill Intangible Assets, Net Intangible assets, net consisted of the following: (in millions) Indefinite- Customer Definite- Acquired Acquired Computer Capitalized Total Gross carrying $ 52.6 $ 362.9 $ 90.1 $ 8.4 $ 2.7 $ 23.3 $ 1.8 $ 541.8 Accumulated — ( 294.7 ) ( 16.0 ) ( 1.8 ) ( 0.5 ) ( 12.1 ) — ( 325.1 ) Net carrying $ 52.6 $ 68.2 $ 74.1 $ 6.6 $ 2.2 $ 11.2 $ 1.8 $ 216.7 Gross carrying $ 54.2 $ 354.3 $ 84.2 $ 6.2 $ 1.5 $ 13.8 $ 5.9 $ 520.1 Accumulated — $ ( 259.4 ) $ ( 12.2 ) ( 0.9 ) ( 0.2 ) $ ( 10.7 ) — ( 283.4 ) Net carrying $ 54.2 $ 94.9 $ 72.0 $ 5.3 $ 1.3 $ 3.1 $ 5.9 $ 236.7 Amortization expense for the three and nine months ended September 30, 2022 was $ 14.0 million and $ 41.7 million , respectively. Amortization expense for the three and nine months ended September 30, 2021 was $ 11.8 million and $ 35.1 million, respectively. Estimated future amortization expense as of September 30, 2022: (in millions) September 30, 2022 $ 14.0 2023 38.9 2024 20.6 2025 15.6 2026 11.3 Thereafter 58.1 $ 158.5 Impairment of Indefinite-Lived Intangible Assets During the first quarter of 2022, the Company identified an interim impairment trigger for one of its indefinite-lived intangible assets. After performing an interim impairment assessment, the Company recognized an impairment charge of $ 1.6 million related to its indefinite-lived intangible assets during the three months ended March 31, 2022. The impairment charge is recorded in intangible asset impairment charges on the condensed consolidated statements of income (loss) and comprehensive income (loss). Indefinite-lived intangible impairment charges in the Design, Creative and Technology reportable segment were $ 1.6 million during the nine months ended September 30, 2022. During the three months ended September 30, 2022, there were no triggering events or changes in circumstances that would indicate the carrying value of the Company’s indefinite-lived intangible assets was impaired. As such, no quantitative assessment for impairment was required during the third quarter of 2022. During the three and nine months ended September 30, 2021, there were no triggering events or changes in circumstances that would indicate the carrying value of the Company’s indefinite-lived intangible assets was impaired. As such, no quantitative assessment for impairment was required during the first, second or third quarters of 2021. Impairment of Long-Lived Assets Other than Goodwill During the three and nine months ended September 30, 2022 and 2021, there were no triggering events or changes in circumstances that would indicate the carrying value of the Company’s long-lived assets other than goodwill are not recoverable. As such, no quantitative assessment for impairment was required during the first, second or third quarters of 2022 or 2021. Goodwill The table below summarizes the changes in the carrying amount of goodwill: Reportable Segment (in millions) Commerce Commerce Design & Design, All Other Total Balance at December 31, 2021 $ 337.5 $ — $ 133.7 $ — $ 43.0 $ 514.2 Acquired goodwill — 7.9 — 23.6 — 31.5 Transfers ( 337.5 ) 342.2 ( 133.7 ) 142.9 ( 13.9 ) — Impairments — — ( 5.8 ) ( 0.5 ) ( 6.3 ) Measurement period adjustment — 6.0 — 0.1 — 6.1 Balance at September 30, 2022 $ — $ 356.1 $ — $ 160.8 $ 28.6 $ 545.5 Impairment of Goodwill During the three months ended March 31, 2022, the Company changed its operating segments which resulted in a change in reporting units. Under accounting standards, the Company was required to perform an impairment assessment of its prior reporting units immediately prior to the change in reporting units and immediately after the change on its new reporting units. To the extent that a prior reporting unit was separated into more than one reporting unit, the allocation of goodwill between the components of the old reporting unit was determined based on their relative fair value. The Company recently completed its annual impairment assessment on October 31, 2021 for its old reporting units. As of this impairment assessment, reporting units where fair value exceeded carrying value by less than 5 % included $ 214.6 million of goodwill. Due to the change in reporting units and a number of prior reporting units where fair value of the reporting unit did not significantly exceed its carrying value, the Company performed a quantitative assessment of the fair value of its prior reporting units as of January 31, 2022 using an income approach with assumptions that are considered Level 3 inputs and concluded that the carrying value of one reporting unit exceeded their respective fair values, resulting in a goodwill impairment of $ 6.3 million during the three months ended March 31, 2022. The values of the respective reporting units were determined primarily by discounting estimated future cash flows, which were determined based on revenue and expense long-term growth assumptions ranging from zero to of 3.0 %, at a weighted average cost of capital (discount rate) ranging from 12.8 % to 15.5 %. We also performed a fair value assessment of our new reporting units utilizing similar inputs and, as a result of that assessment, there was $ 0.5 million of goodwill impairment for one of the Company’s new reporting units. As of the date of our impairment assessment, reporting units where the fair value of the reporting unit was equal to its carrying value contained $ 3.1 million of goodwill. During the three months ended September 30, 2022 management determined there was no triggering event. As such, no goodwill impairment charges were recognized during the three months ended September 30, 2022 . The Company recorded total goodwill impairment of $ 5.8 million and $ 0.5 million for the nine months ended September 30, 2022, related to the Design, Creative and Technology segment and All Other Category, respectively. Goodwill is tested for impairment annually on October 31, and between annual tests if the Company becomes aware of an event or a change in circumstances that would indicate the carrying value may be impaired. During the three and nine months ended September 30, 2021, management determined there was no triggering event. As such, no quantitative assessment for impairment was required during the first, second or third quarters of 2021 .

Debt

Debt	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt	7. Debt Long-term debt related to the Amended and Restated Term Loan Facility is comprised of the following indebtedness to various lenders: (in millions) September 30, December 31, Amended and Restated Term Loan Facility, with 2.50 as of September 30, 2022, 5.27 % and 2.59 % at September 30, 2022 and December 31, 2024 , net (a) $ 513.3 $ 516.6 Less: Current maturities 5.7 5.7 Long-term debt, net of current maturities, debt $ 507.6 $ 510.9 (a) The Amended and Restated Term Loan Facility, a seven-year $ 565.0 million senior secured term loan facility, scheduled to mature on May 22, 2024 (the “Amended and Restated Term Loan Facility”), as of September 30, 2022 was recorded net of unamortized discount of $ 1.0 million and net of unamortized deferred financing fees of $ 1.3 million. The Amended and Restated Term Loan Facility as of December 31, 2021 was recorded net of unamortized discount of $ 1.4 million and net of unamortized deferred financing fees of $ 1.7 million. The fair market value of the Company’s debt under the Amended and Restated Term Loan Facility was $ 496.7 million as of September 30, 2022 . Revolving Credit Facility On February 14, 2020, Emerald Expositions Holding, Inc., a wholly-owned subsidiary of the Company and the borrower under the Amended and Restated Senior Secured Credit Facilities, was renamed Emerald X, Inc. (“Emerald X”). Emerald X had no borrowings outstanding under its Revolving Credit Facility as of September 30, 2022 and December 31, 2021 , respectively. Emerald X had $ 1.0 million in stand-by letters of credit outstanding under the Revolving Credit Facility as of September 30, 2022 and December 31, 2021. Until August 6, 2020, borrowings under the Revolving Credit Facility were subject to an interest rate equal to LIBOR plus 2.75 % or ABR plus 1.75 %. As a result of the Company’s Total First Lien Net Leverage Ratio decreasing below 2.50 to 1.00 (as defined in the Amended and Restated Senior Secured Credit Facilities), from August 7, 2020 through March 31, 2022, borrowings under the Revolving Credit Facility were subject to an interest rate equal to LIBOR plus 2.25 % or ABR plus 1.25 %. Interest Expense Interest expense reported in the condensed consolidated statements of income (loss) and comprehensive income (loss) consists of the following: Three Months Ended Nine Months Ended (in millions) 2022 2021 2022 2021 Senior secured term loan $ 6.4 $ 3.4 $ 14.1 $ 10.4 Non-cash interest for amortization of debt discount 0.3 0.3 1.0 1.1 Revolving credit facility interest and commitment fees 0.1 0.2 0.4 0.5 Total interest expense $ 6.8 $ 3.9 $ 15.5 $ 12.0 Covenants The Revolving Credit Facility contains a financial covenant requiring Emerald X to comply with a 5.50 to 1.00 Total First Lien Net Leverage Ratio, which is defined as the ratio of Consolidated Total Debt (as defined in the Amended and Restated Senior Secured Credit Facilities) secured on a first lien basis, net of unrestricted cash and cash equivalents to trailing four-quarter Consolidated EBITDA (as defined in the Amended and Restated Senior Secured Credit Facilities). This financial covenant is tested on the last day of each quarter only if the aggregate amount of revolving loans, swingline loans and letters of credit outstanding under the Revolving Credit Facility (net of up to $ 10.0 million of outstanding letters of credit) exceeds 35 % of the total commitments thereunder. As of September 30, 2022 , the Company was not required to test this financial covenant and Emerald X was in compliance with all covenants under the Amended and Restated Senior Secured Credit Facilities.

Fair Value Measurements and Fin

Fair Value Measurements and Financial Risk	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value Measurements and Financial Risk	8. Fair Value Measurements and Financial Risk As of September 30, 2022, the Company’s assets and liabilities measured at fair value on a recurring basis other-than-temporary are categorized in the table below: (in millions) Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents $ 175.3 $ 175.3 $ — $ — Certificates of deposits (a) 99.9 — 99.9 — Money market mutual funds (b) 90.9 90.9 — — Total assets at fair value $ 366.1 $ 266.2 $ 99.9 $ — Liabilities Market-based share awards liability (c) $ 0.4 $ — $ — $ 0.4 Contingent consideration (c) 36.3 — — 36.3 Total liabilities at fair value $ 36.7 $ — $ — $ 36.7 (a) The Company’s certificates of deposits of $ 99.9 million as of September 30, 2022 are included within cash and cash equivalents in the condensed consolidated balance sheets. The certificates of deposits with maturities of 90 days or less are not traded in active markets and are classified as Level 2 assets. The certificates of deposits with maturities of 90 days or less are reported at fair values of these assets as of the reporting date. (b) The Company’s money market mutual funds of $ 90.9 million as of September 30, 2022 are included within cash and cash equivalents in the condensed consolidated balance sheets. The money market mutual funds are traded in active markets and quoted in broker or dealer quotations and are classified as Level 1 assets. The fair value of the Company’s money market mutual funds are based on unadjusted quoted prices on the reporting date. (c) The market-based share awards liability of $ 0.4 million as of September 30, 2022 is included within other noncurrent liabilities in the condensed consolidated balance sheet. The fair value of the Company’s market-based share awards and contingent consideration are derived from valuation techniques in which one or more significant inputs are unobservable, including the Company’s own assumptions. Contingent consideration of $ 28.5 million as of September 30, 2022 is included within Contingent consideration in the condensed consolidated balance sheets and Contingent consideration of $ 7.8 million is included within other noncurrent liabilities in the condensed consolidated balance sheets. As of December 31, 2021, the Company’s assets and liabilities measured at fair value on a recurring basis are categorized in the table below: (in millions) Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents: Cash and cash equivalents $ 21.5 $ 21.5 $ — $ — Money market mutual funds (a) 209.7 209.7 — — Total assets at fair value $ 231.2 $ 231.2 $ — $ — Liabilities Market-based share awards liability (b) $ 0.4 $ — $ — $ 0.4 Contingent consideration (b) 36.2 — — 36.2 Total liabilities at fair value $ 36.6 $ — $ — $ 36.6 (a) The Company’s money market mutual funds are based on the closing price of these assets as of the reporting date. The fair value of the Company’s money market mutual funds are based on unadjusted quoted prices on the reporting date. The Company’s money market mutual funds are quoted in an active market and classified as Level 1 assets. (b) Included within other noncurrent liabilities in the condensed consolidated balance sheet. The fair value of the Company’s market-based share awards and contingent consideration are derived from valuation techniques in which one or more significant inputs are unobservable, including the Company’s own assumptions. Market-based Share Awards The market-based share awards liability of $ 0.4 million and $ 0.4 million as of September 30, 2022 and December 31, 2021 , respectively, entitles the grantees of these awards the right to receive shares of common stock equal to a maximum cash value of $ 9.8 million, in the aggregate, upon achievement of specified targeted share prices measured over sixty days within a ninety-day trading period. The liability is measured at fair value and is re-measured to an updated fair value at each reporting period. The Company recognizes stock-based compensation expense for awards subject to market-based vesting conditions regardless of whether it becomes probable that these conditions will be achieved. The stock-based compensation expense is included in selling, general and administrative expense in the condensed consolidated statements of income (loss) and comprehensive income (loss). Refer to Note 10, Stock-Based Compensation , under the heading Market-based Share Awards for unobservable inputs for the market-based share award liability. Contingent Consideration As of September 30, 2022 and December 31, 2021, the Company had $ 36.3 million and $ 36.2 million , respectively, in contingent consideration liabilities measured at fair value related to the Company’s acquisitions of G3 Communications, EDspaces, PlumRiver, Sue Bryce Education, MJBiz, Advertising Week and Bulletin. The contingent consideration liability of $ 36.3 million as of September 30, 2022 consists of liabilities of $ 28.5 million, $ 1.9 million, $ 0.3 million and $ 5.7 million that are expected to be settled in 2023, 2024, 2025 and 2027, respectively. Refer to Note 4, Business Acquisitions , for further information related to the measurement period adjustment for the MJBiz contingent consideration and the contingent consideration related to the acquisitions of Advertising Week and Bulletin. The Company paid $ 6.5 million in contingent consideration during the first quarter of 2022 in relation to the Company’s acquisition of G3 Communications. The liabilities are re-measured to fair value each reporting period. As a result of the Company’s remeasurements during the first, second and third quarters of 2022 , the Company recorded a $ 9.6 million decrease in fair value of contingent consideration, which is included in selling, general and administrative expense in the condensed consolidated statements of income (loss) and comprehensive income (loss). The determination of the fair value of the contingent consideration liabilities could change in future periods. Any such changes in fair value will be reported in selling, general and administrative expense in the condensed consolidated statements of income (loss) and comprehensive income (loss). Financial Risk The Company’s condensed consolidated financial statements reflect estimates and assumptions made by management that affect the reported amount of assets and liabilities.

Redeemable Convertible Preferre

Redeemable Convertible Preferred Stock and Stockholders' Deficit	9 Months Ended
	Sep. 30, 2022
Temporary Equity And Stockholders Equity Note [Abstract]
Redeemable Convertible Preferred Stock and Stockholders' Deficit	9. Redeemable Convertible Preferred Stock and Stockholders’ Deficit Redeemable Convertible Preferred Stock On June 10, 2020, the Company entered into an investment agreement (the “Investment Agreement”) with Onex Partners V LP (“Onex”), pursuant to which the Company agreed to (i) issue to an affiliate of Onex, in a private placement transaction (the “Initial Private Placement”), 47,058,332 shares of redeemable convertible preferred stock for a purchase price of $ 5.60 per share and (ii) effect a rights offering to holders of its outstanding common stock of one non-transferable subscription right for each share of the Company’s common stock held, with each right entitling the holder to purchase one share of redeemable convertible preferred stock at the Series A Price per share. Onex agreed to purchase (the “Onex Backstop”) any and all redeemable convertible preferred stock not subscribed for in the Rights Offering by stockholders other than affiliates of Onex at the Series A Price per share. On June 29, 2020 (the “First Closing Date”), Emerald received proceeds of $ 252.0 million, net of fees and expenses of $ 11.6 million, from the sale of redeemable convertible preferred stock to Onex in the Initial Private Placement. Emerald used $ 50.0 million of the net proceeds from the sale of redeemable convertible preferred stock to repay outstanding debt under the Revolving Credit Facility and expects to use the remaining proceeds for general corporate purposes, including organic and acquisition growth initiatives. The Rights Offering subscription period started and ended on July 7, 2020 and July 22, 2020, respectively. On July 24, 2020, the Company issued a further 1,727,427 shares of redeemable convertible preferred stock pursuant to the Rights Offering and received proceeds of approximately $ 9.7 million. Pursuant to the Onex Backstop, on August 13, 2020, an additional 22,660,587 shares of redeemable convertible preferred stock were sold to Onex in exchange for approximately $ 121.3 million, net of fees and estimated expenses of $ 5.6 million. The rights of the redeemable convertible preferred stock are summarized below. Liquidation Preference Upon liquidation or dissolution of the Company, the holders of redeemable convertible preferred stock are entitled to receive the greater of (a) the accreted liquidation preference, and (b) the amount the holders of redeemable convertible preferred stock would have received if they had converted their redeemable convertible preferred stock into common stock immediately prior to such liquidation or dissolution. Dividends Each share of redeemable convertible preferred stock will accumulate dividends at a rate per annum equal to 7 % of the accreted liquidation preference, compounding quarterly by adding to the accreted liquidation preference until July 1, 2023 and thereafter, at the Company’s option, paid either in cash or by adding to the accreted liquidation preference. During the three and nine months ended September 30, 2022 , the redeemable convertible preferred stock accumulated $ 8.0 million and $ 23.6 million worth of dividends, respectively, bringing the aggregate accreted liquidation preference to $ 467.7 million as of September 30, 2022 . There were no dividends declared or paid in the first, second or third quarters of 2022 or 2021 . Holders of redeemable convertible preferred stock are also entitled to participate in and receive any dividends declared or paid on the Company’s common stock on an as-converted basis, and no dividends may be paid to holders of common stock unless the aggregate accreted liquidation preference on the redeemable convertible preferred stock has been paid or holders of a majority of the outstanding redeemable convertible preferred stock have consented to such dividends. Conversion Features Shares of the redeemable convertible preferred stock may be converted at the option of the holder into a number of shares of common stock equal to (a) the amount of the accreted liquidation preference, divided by (b) the applicable conversion price. Each share of redeemable convertible preferred stock had an initial liquidation preference of $ 5.60 and were initially convertible into approximately 1.59 shares of common stock, which is equivalent to the initial liquidation preference per share of $ 5.60 divided by the initial conversion price of $ 3.52 per share. The conversion price is subject to customary anti-dilution adjustments upon the occurrence of certain events, including downward adjustment in the event the Company issues securities, subject to exceptions, at a price that is lower than the fair market value of such securities. If, at any time following the third anniversary of the First Closing Date the closing price per share of the Company’s common stock exceeds 175 % of the then-applicable conversion price for at least 20 consecutive trading days, the Company may, at its option, and subject to certain liquidity conditions, cause any or all of the then outstanding shares of redeemable convertible preferred stock to be converted automatically into common stock at the then applicable conversion price. Redemption Features The Company has the right to redeem all, but not less than all, of the redeemable convertible preferred stock on or after June 29, 2026 for a cash purchase price equal to (a) on or after the six-year anniversary of the initial issuance date, 105 % of the accreted liquidation preference, (b) on or after the seven-year anniversary of the initial issuance date, 103 % of the accreted liquidation preference or (c) on or after the eight-year anniversary of the initial issuance date, the accreted liquidation preference. In addition, if there is a change of control transaction involving the Company prior to the six-year anniversary of the First Closing Date, the Company has the right to redeem all, but not less than all, of the redeemable convertible preferred stock for a cash purchase price equal to the accreted liquidation preference plus the net present value of the additional amount by which the accreted liquidation preference would have otherwise increased from the date of such redemption through the sixth anniversary of the closing. If, after the Company ceases to have a controlling stockholder group, there is a change of control transaction involving the Company, holders of redeemable convertible preferred stock may elect to (x) convert their redeemable convertible preferred stock into shares of common stock at the then current conversion price or (y) require the Company to redeem the redeemable convertible preferred stock for cash, at a price per share equal to the then-unpaid accreted liquidation preference. Although only Unaffiliated Directors (as defined below) can be involved in any decisions with respect to the Company’s rights to exercise the redemption features, the holders of the redeemable convertible preferred stock control the majority of the votes through representation on the board of directors. Therefore, the redeemable convertible preferred stock is required to be accreted to its redemption price on the date the redemption option first becomes exercisable. For the three months ended September 30, 2022 and 2021, the Company recorded $ 9.9 million and $ 9.0 million in deemed dividends, respectively, and for the nine months ended September 30, 2022 and 2021, the Company recorded $ 28.7 million and $ 26.3 million in deemed dividends, respectively, representing the accretion of the redeemable convertible preferred stock to the redemption value. Voting Rights Certain matters will require the approval of holders of a majority of the redeemable convertible preferred stock, including (i) amendments to the Company’s organizational documents in a manner adverse to the redeemable convertible preferred stock, (ii) the creation or issuance of senior or parity equity securities or (iii) the issuance of any convertible indebtedness, other class of redeemable convertible preferred stock or other equity securities in each case with rights to payments or distributions in which the redeemable convertible preferred stock would not participate on a pro-rata, as-converted basis. In addition, for so long as the redeemable convertible preferred stock represents more than 30 % of the outstanding common stock on an as-converted basis, without the approval of a majority of the directors elected by the holders of the redeemable convertible preferred stock, the Company may not (i) incur new indebtedness to the extent certain financial metrics are not satisfied, (ii) redeem or repurchase any equity securities junior to the redeemable convertible preferred stock, (iii) enter into any agreement for the acquisition or disposition of assets or businesses involving a purchase price in excess of $ 100 million, (iv) hire or terminate the chief executive officer of the Company or (v) make a voluntary filing for bankruptcy or commence a dissolution of the Company. For so long as the redeemable convertible preferred stock represents a minimum percentage of the outstanding shares of common stock on an as-converted basis as set forth in the Certificate of Designations relating to the redeemable convertible preferred stock, the holders of the redeemable convertible preferred stock shall have the right to appoint up to five members of the Company’s Board of Directors (the “Board”). All decisions of the Company’s Board with respect to the exercise or waiver of the Company’s rights relating to the redeemable convertible preferred stock shall be determined by a majority of the Company’s directors that are not employees of the Company or affiliated with Onex (“Unaffiliated Directors”), or a committee of Unaffiliated Directors. As part of the transactions contemplated by the Investment Agreement, the Company and Onex entered into a Registration Rights Agreement whereby Onex is entitled to certain demand and piggyback registration rights in respect of the redeemable convertible preferred stock and the shares of common stock issuable upon conversion thereof. Dividends There were no dividends paid or declared during the first, second or third quarters of 2 0 22 and 2021. Share Repurchases October 2020 Share Repurchase Program (“October 2020 Share Repurchase Program”) In October 2020, the Company’s Board authorized and approved a $ 20.0 million share repurchase program. Under the terms of the October 2020 Share Repurchase Program, the Company may, from time to time, purchase shares of its common stock for an aggregate purchase price not to exceed $ 20.0 million through December 31, 2021, subject to early termination or extension by the Board. In October 2022, the Company's Board approved an extension and expansion of its share repurchase program which allows for the repurchase of $ 20.0 million of the Company's common stock through December 31, 2023 subject to early termination or extension by the Board. The share repurchase program may be suspended or discontinued at any time without notice. The Company repurchased 1,590,030 shares and 2,828,236 shares for $ 5.9 million and $ 10.2 million during the three and nine months ended September 30, 2022 , respectively. The Company repurchased 1,193,861 shares and 2,122,964 shares for $ 5.5 million and $ 10.7 million during the three and nine months ended September 30, 2021 , respectively. There was $ 9.2 million remaining available for share repurchases under the October 2020 Share Repurchase Program as of September 30, 2022 .

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Stock-Based Compensation	10. Stock-Based Compensation The Company recognizes cumulative stock-based compensation expense for the portion of the awards for which the service period and performance or market conditions, as applicable, have been satisfied. Stock-based compensation expense is included in selling, general and administrative expense in the condensed consolidated statements of income (loss) and comprehensive income (loss). The related deferred tax benefit for stock-based compensation recognized was $ 0.3 million and $ 1.1 million for the three and nine months ended September 30, 2022 , respectively. The related deferred tax benefit for stock-based compensation recognized was $ 0.5 million and $ 1.7 million for the three and nine months ended September 30, 2021. 2019 Employee Stock Purchase Plan (the “ESPP”) In January 2019, the Company’s Board approved the ESPP, which was approved by the Company’s stockholders in May 2019. The ESPP requires that participating employees must be customarily employed for at least 20 hours per week, have completed at least 6 months of service, and have compensation (as defined in the ESPP) not greater than $ 150,000 in the 12-month period before the enrollment date to be eligible to participate in the ESPP. Under the ESPP, eligible employees will receive a 10 % discount from the lesser of the closing price on the first day of the offering period and the closing price on the purchase date. The Company reserved 500,000 shares of its common stock for issuance under the ESPP. The ESPP expense recognized by the Company was not material for the three and nine months ended September 30, 2022 and 2021. Stock Options The Company recognized stock-based compensation expense relating to stock option activity of $ 0.9 million and $ 3.1 million for the three and nine months ended September 30, 2022 , respectively. The Company recognized stock-based compensation expense relating to stock option activity of $ 1.6 million and $ 4.9 million for the three and nine months ended September 30, 2021, respectively. Stock option activity for the nine months ended September 30, 2022, was as follows: Weighted-Average Number of Exercise Price Remaining Aggregate (thousands) (years) (millions) Outstanding at December 31, 2021 14,403 $ 8.10 8.1 $ — Granted 575 5.66 Exercised Forfeited ( 523 ) 10.18 Outstanding at September 30, 2022 14,455 $ 7.93 7.5 $ — Exercisable at September 30, 2022 4,845 $ 10.97 5.8 $ — The aggregate intrinsic value is the amount by which the fair value of the Company’s common stock exceeded the exercise price of the options as of the close of trading hours on the New York Stock Exchange on September 30, 2022 for those options for which the market price was in excess of the exercise price. There was a total of $ 8.5 million unrecognized stock-based compensation expense at September 30, 2022 related to unvested stock options expected to be recognized over a weighted-average period of 2.72 years. Restricted Stock Units (“RSUs”) The Company periodically grants RSUs that contain service and, in certain instances, performance and market conditions to certain directors, executives and employees. Stock-based compensation expense relating to RSU activity recognized in the three and nine months ended September 30, 2022 was $ 0.5 million and $ 1.9 million, respectively. Stock-based compensation expense relating to RSU activity recognized in the three and nine months ended September 30, 2021 was $ 0.9 million and $ 3.3 million, respectively. There was a total of $ 2.5 million of unrecognized stock-based compensation expense at September 30, 2022 related to unvested RSUs expected to be recognized over a weighted-average period of 2.0 years. RSU activity for the three months ended September 30, 2022 was as follows: (share data in thousands, except per share data) Number of Weighted Unvested balance, December 31, 2021 1,358 $ 8.13 Granted 126 3.58 Forfeited ( 47 ) 10.72 Vested ( 504 ) 8.73 Unvested balance, September 30, 2022 933 $ 7.05 Market-based Share Awards In January 2020, the Company granted performance-based market condition share awards to one senior executive under the 2017 Omnibus Equity Plan, which entitle this employee the right to receive shares of common stock equal to a maximum value of $ 4.9 million in the aggregate upon achievement of specified targeted share prices measured over sixty days within a ninety-day trading period. In June 2019, the Company granted performance-based market condition share awards to one senior executive under the 2017 Omnibus Equity Plan, which entitle this employee the right to receive shares of common stock equal to a maximum value of $ 4.9 million in the aggregate, upon achievement of specified targeted share prices measured over sixty days within a ninety-day trading period. As of September 30, 2022 , all outstanding performance-based market condition share awards remain unvested with an estimated weighted average conversion threshold of $ 21.08 per share, which would result in an estimated 78,041 shares of common stock to be issued upon vesting. Each of the estimated 78,041 shares of common stock have a weighted-average grant date fair value of $ 24.77 per share. As of September 30, 2022 and December 31, 2021, the liability for these awards was $ 0.4 million and $ 0.4 million , respectively, and is reported on the condensed consolidated balance sheets in other noncurrent liabilities. The fair value of performance-based market condition share awards is estimated on the grant date using a risk-neutral Monte Carlo simulation model. The grant date fair value of the remaining outstanding awards granted in 2019 was $ 0.8 million. The grant date fair value of the 2020 awards was $ 1.1 million. The Company recognized stock-based compensation expense relating to performance-based market condition share awards of a credit of $ 0.1 million and zero for the three and nine months ended September 30, 2022 , respectively. The Company recognized stock-based compensation expense relating to performance-based market condition share awards of zero during the three and nine months ended September 30, 2021, respectively. The assumptions used in determining the fair value for the performance-based market condition share awards outstanding at September 30, 2022 were as follows: September 30, Expected volatility 57.50 % Dividend yield 0.00 % Risk-free interest rate 3.97 % Weighted-average expected term (in years) 4.5 The weighted-average expected term of the Company’s performance-based market condition share awards is the weighted-average of the derived service periods for the share awards.

Earnings Per Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Earnings Per Share	11. Earnings Per Share Basic earnings per share is computed using the weighted-average number of common shares outstanding during the period. Diluted earnings per share is computed using the weighted-average number of common shares outstanding during the period, plus the dilutive effect of outstanding options, using the treasury stock method and the average market price of the Company's common stock during the applicable period. Certain shares related to some of the Company's outstanding employee share awards were excluded from the computation of diluted earnings per share, because they were antidilutive in the periods presented but could be dilutive in the future. Performance-based market condition share awards are considered contingently issuable shares, which would be included in the denominator for earnings per share if the applicable market conditions have been achieved, and the inclusion of any performance-based market condition share awards is dilutive for the respective reporting periods. For both the three and nine months ended September 30, 2022 and 2021, unvested performance-based market condition share awards were excluded from the calculation of diluted earnings per share because the market conditions had not been met. There were 71,416,907 7 % Series A Redeemable Convertible Participating Preferred Stock shares outstanding which were convertible into 132,868,526 shares of common stock at September 30, 2022. These preferred stock shares were anti-dilutive for the three and nine months ended September 30, 2022 and are therefore excluded from the diluted income (loss) per common share calculation. The details of the computation of basic and diluted earnings per common share are as follows: Three Months Ended Nine Months Ended (dollars in millions, share data in thousands except earnings per share) 2022 2021 2022 2021 Net income (loss) and comprehensive income (loss) $ 93.0 $ ( 9.0 ) $ 108.4 $ ( 70.8 ) Accretion to redemption value of redeemable ( 9.9 ) ( 9.0 ) ( 28.7 ) ( 26.3 ) Participation rights on if-converted basis ( 54.7 ) — ( 51.9 ) — Net income (loss) and comprehensive income (loss) $ 28.4 $ ( 18.0 ) $ 27.8 $ ( 97.1 ) Weighted average common shares outstanding 68,433 71,033 69,479 71,719 Basic income (loss) per share $ 0.42 $ ( 0.25 ) $ 0.40 $ ( 1.35 ) Net income (loss) and comprehensive income (loss) $ 28.4 $ ( 18.0 ) $ 27.8 $ ( 97.1 ) Diluted weighted average common shares 68,643 71,033 69,588 71,719 Diluted income (loss) per share $ 0.41 $ ( 0.25 ) $ 0.40 $ ( 1.35 ) Anti-dilutive employee share awards excluded 14,455 1,259 14,814 14,911

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	12. Income Taxes The Company determines its interim income tax provision by applying the estimated effective income tax rate expected to be applicable for the full fiscal year to the income (loss) before income taxes for the period. In determining the full year effective tax rate estimate, the Company does not include the estimated impact of unusual and/or infrequent items, which may cause significant variations in the expected relationship between income tax expense (benefit) and pre-tax income (loss). Significant judgment is exercised in determining the income tax provision due to transactions, credits and estimates where the ultimate tax determination is uncertain. The Company’s U.S. federal statutory corporate income tax rate was 21 % as of September 30, 2022. For the three and nine months ended September 30, 2022, the Company recorded provision for income taxes of $ 28.2 million and $ 30.3 million , respectively, which resulted in an effective tax rate of 23.3 % and 21.8 %, respectively. The differences between the U.S. federal statutory and effective tax rates before discrete items are primarily attributable to changes in valuation allowances, nondeductible officer compensation and goodwill impairment. For the three and nine months ended September 30, 2021, the Company recorded a benefit from income taxes of $ 2.0 million and a provision for income taxes of $ 0.6 million , respectively, which resulted in effective tax rates of 17.5 % and negative 0.9 %, respectively. Liabilities for unrecognized tax benefits and associated interest and penalties were zero as of September 30, 2022 and December 31, 2021 , respectively.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2022
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	13. Commitments and Contingencies Leases and Other Contractual Arrangements The Company has entered into operating leases and other contractual obligations to secure real estate facilities, equipment and trade show venues. These agreements are not unilaterally cancelable by the Company, are legally enforceable and specify fixed or minimum amounts or quantities of goods or services at fixed or minimum prices. Legal Proceedings and Contingencies The Company is subject to litigation and other claims in the ordinary course of business. In the opinion of management, the Company’s liability, if any, arising from regulatory matters and legal proceedings related to these matters is not expected to have a material adverse impact on the Company’s condensed consolidated balance sheets, results of operations or cash flows. In the opinion of management, there are no claims, commitments or guarantees pending to which the Company is party that would have a material adverse effect on the condensed consolidated financial statements.

Accounts Payable and Other Curr

Accounts Payable and Other Current Liabilities	9 Months Ended
	Sep. 30, 2022
Payables And Accruals [Abstract]
Accounts Payable and Other Current Liabilities	14. Accounts Payable and Other Current Liabilities Accounts payable and other current liabilities consisted of the following: (in millions) September 30, December 31, Accrued event costs $ 11.5 $ 9.5 Accrued personnel costs 19.6 16.0 Trade payables 16.8 12.0 Other current liabilities 17.1 10.8 Total accounts payable and other $ 65.0 $ 48.3

Segment Information

Segment Information	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Segment Information	15. Segment Information The Company routinely evaluates whether its operating and reportable segments continue to reflect the way the Chief Operating Decision Maker (the “CODM”) evaluates the business. The determination is based on: (1) how the Company’s CODM evaluates the performance of the business, including resource allocation decisions, and (2) whether discrete financial information for each operating segment is available. The Company considers its CEO to be its CODM. The CODM evaluates performance based on the results of seven executive brand portfolios, which represent the Company’s seven operating segments. The brands managed by the Company’s segment managers do not necessarily align with specific industry sectors. Due to economic similarities and the nature of services, fulfillment processes of those services and types of customers, five operating segments are aggregated into two reportable segments, the Commerce and the Design, Creative, and Technology reportable segments. In addition, two operating segments did not meet the quantitative thresholds of a reportable segment and did not meet the aggregation criteria set forth in ASC Topic 280, Segment Reporting . Therefore, results for these operating segments are included in the rows labeled "All Other" in the tables below for all periods presented. Six of the executive portfolios generate revenues through the production of trade show events, including booth space sales, registration fees and sponsorship fees. In addition, these six segments generate revenues from marketing activities, including digital and print media. The seventh operating segment generates revenues from Emerald’s software-as-a-service platform. Operating segment performance is evaluated by the Company’s CODM based on revenues and Adjusted EBITDA, a non-GAAP measure, defined as EBITDA exclusive of general corporate expenses, stock-based compensation expense, impairments and other items. These adjustments are primarily related to items that are managed on a consolidated basis at the corporate level. The exclusion of such charges from each segment is consistent with how the CODM evaluates segment performance. The following table presents a reconciliation of reportable segment revenues, other income, net, and Adjusted EBITDA to net income (loss): Three Months Ended Nine Months Ended (in millions) 2022 2021 (1) 2022 2021 (1) Revenues Commerce $ 33.9 $ 38.8 $ 110.3 $ 48.3 Design, Creative, and Technology 23.0 34.8 108.1 48.0 All Other 5.5 2.9 13.9 8.1 Total revenues $ 62.4 $ 76.5 $ 232.3 $ 104.4 Other Income, net Commerce $ 2.4 $ 1.1 $ 8.0 $ 7.8 Design, Creative, and Technology — — 25.3 9.2 All Other — — 0.9 0.5 Total other income, net $ 2.4 $ 1.1 $ 34.2 $ 17.5 Adjusted EBITDA Commerce $ 16.0 $ 17.2 $ 57.6 $ 19.9 Design, Creative, and Technology 2.5 4.2 57.0 7.3 All Other ( 3.1 ) ( 0.5 ) ( 8.1 ) ( 0.1 ) Subtotal Adjusted EBITDA $ 15.4 $ 20.9 $ 106.5 $ 27.1 General corporate and other expenses $ ( 14.3 ) $ ( 11.5 ) $ ( 40.6 ) $ ( 34.0 ) Other Income, net (2) 148.6 — 148.6 — Interest expense, net ( 6.0 ) ( 3.9 ) ( 14.4 ) ( 12.0 ) Goodwill impairment charge — — ( 6.3 ) — Intangible asset impairment charge — — ( 1.6 ) — Depreciation and amortization expense ( 14.7 ) ( 12.2 ) ( 43.0 ) ( 36.1 ) Stock-based compensation expense ( 1.3 ) ( 2.4 ) ( 5.0 ) ( 8.2 ) Deferred revenue adjustment ( 0.2 ) ( 0.3 ) ( 0.6 ) ( 1.4 ) Other items ( 6.3 ) ( 1.6 ) ( 4.9 ) ( 5.6 ) Income (loss) before income taxes $ 121.2 $ ( 11.0 ) $ 138.7 $ ( 70.2 ) (1) Segment disclosures for the current and prior year reflect the new reportable segment structure. (2) On August 3, 2022, the Company reached an agreement for a one-time settlement of outstanding insurance litigation relating to event cancellation insurance for proceeds of $ 148.6 million. The one-time settlement payment was not specifically attributable to any of the Company's outstanding event cancellation insurance claims and therefore was not recorded at the segment level. The other income, net related to this one-time settlement is not indicative of any one segment's performance and is not included in the measure of segment profit and loss analyzed by the CODM on a regular basis. The Company’s CODM does not receive information with a measure of total assets or capital expenditures for each operating segment as this information is not used for the evaluation of executive brand portfolio performance as the Company’s operations are not capital intensive. Capital expenditure information is provided to the CODM on a consolidated basis. Therefore, the Company has not provided asset and capital expenditure information by reportable segment. Intersegment revenues were immaterial for the three months ended September 30, 2022 and 2021. For the three months ended September 30, 2022 and 2021 , substantially all revenues were derived from transactions in the United States.

Related Party Transactions

Related Party Transactions	9 Months Ended
	Sep. 30, 2022
Related Party Transactions [Abstract]
Related Party Transactions	16. Related Party Transactions Investment funds affiliated with Onex Corporation owned approximately 88.1 % of the Company’s common stock on an as-converted basis as of September 30, 2022 . Affiliates of Onex Corporation held a 48.0 % ownership position in ASM Global (“ASM”), including SMG Food & Beverage, LLC, a wholly-owned subsidiary of ASM, which the Company has contracted with for catering services at certain of the Company’s trade shows and events and a 97.0 % ownership position in Convex Group Ltd. (“Convex”), which is one of the insurers in the syndicate that provides the Company’s insurance coverage. Additionally, certain of the Company’s future tradeshows and other events may be held at facilities managed by ASM. The Company made payments of $ 0.4 million and $ 1.2 million to ASM and ASM managed facilities during the three and nine months ended September 30, 2022 , respectively. The Company made payments of $ 0.3 million and $ 0.4 million to ASM and ASM managed facilities during the three and nine months ended September 30, 2021 , respectively. The Company had zero and $ 0.1 million due to ASM as of September 30, 2022 and December 31, 2021 , respectively. The Company made payments of zero and $ 0.5 million to Convex during the three and nine months ended September 30, 2022 , respectively. The Company made no payments to Convex for the three and nine months ended September 30, 2021 . The Company had no accounts payable due to Convex as of September 30, 2022 and December 31, 2021 .

Subsequent Event

Subsequent Event	9 Months Ended
	Sep. 30, 2022
Subsequent Events [Abstract]
Subsequent Event	17. Subsequent Event October 2022 Share Repurchase Program Extension and Expansion On October 26, 2022, the Company's Board approved an extension and expansion of its share repurchase program, which allows for the repurchase of $ 20.0 million of the Company's common stock through December 31, 2023, subject to early termination or extension by the Board. The share repurchase program may be suspended or discontinued at any time without notice.

Basis of Presentation (Policies

Basis of Presentation (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	1. Basis of Presentation The unaudited condensed consolidated financial statements include the operations of Emerald Holding, Inc. (the “Company” or “Emerald”) and its wholly-owned subsidiaries. These unaudited condensed consolidated financial statements are presented in conformity with accounting principles generally accepted in the United States of America (“GAAP”) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the SEC for Interim Reporting. All intercompany transactions, accounts and profits/losses, if any, have been eliminated in the unaudited condensed consolidated financial statements. In the opinion of management, all recurring adjustments considered necessary for a fair statement of results for the interim period have been included. These unaudited condensed consolidated financial statements do not include all disclosures required by GAAP, therefore, these unaudited condensed consolidated financial statements should be read in conjunction with the more detailed audited consolidated financial statements for the year ended December 31, 2021. The December 31, 2021 condensed consolidated balance sheet was derived from the Company’s audited consolidated financial statements for the year ended December 31, 2021. The results for the three and nine months ended September 30, 2022 are not necessarily indicative of results to be expected for a full year, any other interim periods or any future year or period. Results of our reportable segments for the three and nine months ended September 30, 2022 reflect the updated segment presentation discussed below in Note 15 “ Segment Information ”. Revision of Previously Issued Financial Statements In conjunction with the Company’s close process for the second quarter of 2022, management identified an immaterial error relating to a payment due to a third party as a result of the Company’s recognition of insurance claim proceeds associated with a cancelled event in 2021 as a result of COVID-19. Management determined that upon recognition of the insurance proceeds during December of 2021, the Company did not appropriately record a liability in the amount of $ 1.6 million, representing the portion of the insurance proceeds that were payable to the third party. The failure to accrue this payment due to the third party resulted in Cost of revenues and Accounts payable and other current liabilities being understated by $ 1.6 million. Management evaluated the impact of this error on the Company’s Q4 and full year 2021 consolidated financial statements and determined that the consolidated financial statements were not materially misstated. However, in order to correctly state equity, the December 31, 2021 stockholders’ deficit has been corrected to reflect the impact of this immaterial error. The Company will revise its consolidated financial statements as of and for the year ended December 31, 2021 when it files its Form 10-K for the period ended December 31, 2022. The following tables reflect the impact of the revision to the specific line items presented in the Company’s previously reported consolidated financial statements as of and for the year ended December 31, 2021 (dollars in millions, share data in thousands except earnings per share and share par value): Consolidated Balance Sheet December 31, 2021 (dollars in millions, share data in thousands, except par value) As Originally Adjustments As Revised Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Deficit Current liabilities Accounts payable and other current liabilities $ 46.7 $ 1.6 $ 48.3 Total current liabilities 190.1 1.6 191.7 Total liabilities 747.9 1.6 749.5 Accumulated deficit ( 773.3 ) ( 1.6 ) ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Total liabilities, redeemable convertible preferred $ 1,062.4 — $ 1,062.4 Year ended December 31, 2021 Consolidated Statements of Income (Loss) and As Originally Adjustments As Revised (dollars in millions, share data in thousands except earnings per share) Cost of revenues 55.5 1.6 57.1 Operating loss ( 63.1 ) ( 1.6 ) ( 64.7 ) Loss before income taxes ( 79.4 ) ( 1.6 ) ( 81.0 ) Net loss and comprehensive loss ( 78.1 ) ( 1.6 ) ( 79.7 ) Net loss and comprehensive loss attributable $ ( 113.7 ) $ ( 1.6 ) $ ( 115.3 ) Basic loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Diluted loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Basic weighted average common shares outstanding 71,309 71,309 71,309 Diluted weighted average common shares outstanding 71,309 71,309 71,309 Year ended December 31, 2021 Consolidated Statement of Redeemable Convertible As Originally Adjustments As Revised (in millions) Net loss and comprehensive loss attributable to: Accumulated deficit $ ( 773.3 ) $ ( 1.6 ) $ ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Consolidated Statement of Cash Flows Year ended December 31, 2021 (in millions) As Originally Adjustments As Revised Operating activities Net loss $ ( 78.1 ) $ ( 1.6 ) $ ( 79.7 ) Changes in operating assets and liabilities: Accounts payable and other current liabilities 19.2 1.6 20.8 Net cash provided by operating activities 90.0 — 90.0 There was no impact on cash flows from investing or financing activities. The accompanying applicable Notes have been updated to reflect the revision for the year ended December 31, 2021.
Liquidity Position and Management's Plan	Liquidity Position and Management’s Plan The unprecedented and rapid spread of COVID-19 and the related government restrictions and social distancing measures implemented in the United States and throughout the world significantly impacted Emerald’s business from mid-March 2020 through the end of fiscal year 2021. Late in the second quarter of 2021, management began to see positive impacts of successful vaccination rollouts in many countries, with social distancing restrictions easing and live events resuming in the United States. In the second half of 2021, Emerald’s live events business experienced a meaningful restart with the successful execution of 56 in-person events, serving more than 129,000 attendees and 7,500 exhibiting companies. The Company began 2022 planning to stage a full slate of events and successfully traded 84 in-person events during the first nine months of the year, serving approximately 282,300 attendees and 13,300 exhibiting companies. While the Company has been able to resume its full schedule of events in 2022, the ongoing effects of COVID-19 on the Company’s operations have had, and will continue to have, a negative impact on its financial results and liquidity. The assumptions used to estimate the Company’s liquidity are subject to greater uncertainty because the Company has never previously cancelled or postponed all upcoming events for a period of over a year due to a pandemic. Management cannot estimate with certainty when event exhibitors and attendees will attend the Company’s events in numbers similar to pre-pandemic editions now that our events have fully resumed. Therefore, current estimates of revenues and the associated impact on liquidity could differ significantly in the future. On August 3, 2022, the Company reached an agreement to settle outstanding insurance litigation relating to event cancellation insurance for proceeds of $ 148.6 million. During the three and nine months ended September 30, 2022, the Company recorded other income, net of $ 151.0 million and $ 182.8 million , respectively, related to event cancellation insurance claim and settlement proceeds deemed to be realizable by management. All of the other income, net for the first nine months of 2022 was received during the period. During each of the three and nine months ended September 30, 2021, the Company recorded other income, net of $ 1.1 million and $ 17.5 million , respectively, related to event cancellation insurance claim proceeds deemed to be realizable by management. All of the other income, net for the first nine months of 2021 was received during the period. Emerald’s renewed event cancellation insurance policies for the year 2022 do not cover losses due to event cancellations caused by the outbreak of communicable diseases, including COVID-19. The aggregate limit for the Company’s renewed 2022 primary event cancellation insurance policy is $ 100.0 million. The Company also obtained a similar separate event cancellation insurance policy for the Surf Expo Winter 2022 and Surf Expo Summer 2022 shows, with a coverage limit of $ 8.4 million and $ 6.5 million for each respective event. As of September 30, 2022 , the Company had $ 515.3 million of borrowings outstanding under the Amended and Restated Term Loan Facility and no borrowings outstanding under the Revolving Credit Facility. In addition, as of September 30, 2022, the Company had cash and cash equivalents of $ 366.1 million . As of September 30, 2022, the Company was in compliance with the covenants contained in the Amended and Restated Senior Secured Credit Facilities. Based on the Company's return to positive operating cash flows, current cash position and assumptions regarding the impact of COVID-19, management believes that the Company’s current financial resources will be sufficient to fund its liquidity requirements for the next twelve months.
Use of Estimates and Judgments	Use of Estimates and Judgments The preparation of financial statements in conformity with GAAP requires management to make estimates and judgments that affect the amounts reported and disclosed in the condensed consolidated financial statements and accompanying notes. Actual results could differ materially from those estimates. On an ongoing basis, the Company evaluates its estimates and judgments compared to historical experience and expected trends. The COVID-19 pandemic and related effects are dynamic and ongoing, and the Company has considered its impact when developing its estimates and assumptions. Actual results and outcomes may differ from management's estimates and assumptions.
Marketable Securities	Marketable Securities The Company received $ 50.0 million in proceeds from the maturity of its marketable securities during the three months ended September 30, 2022 and no longer held any marketable securities as of September 30, 2022. Therefore, there were no unrealized holding gains or losses during the period. The Company has in the past held, and may from time to time hold marketable securities that consisting of certificates of deposit with financial institutions with maturities over three months and up to one year. These have historically been classified as marketable debt securities as their underlying investments primarily consist of corporate debt securities. These certificates of deposits have readily ascertainable values as they can be readily purchased or sold using established markets. These investments were classified as available-for-sale and were reported at fair value on the Company's condensed consolidated balance sheets. Unrealized holding gains and losses were immaterial for the three and nine months ended September 30, 2022 and are reported within accumulated other comprehensive income in the Company's condensed consolidated statements of stockholders’ equity (deficit). Fair value was based on available market information including quoted broker or dealer quotations, or other observable inputs. The Company did no t hold any marketable securities at September 30, 2021 therefore, there were no unrealized holding gains or losses. The Company invests its marketable securities in high-quality commercial financial instruments. The Company believes it is not exposed to significant credit risk on its marketable securities.
Segment Reporting	Segment Reporting Operating segments are components of an enterprise for which discrete financial reporting information is available that is evaluated regularly by the chief operating decision maker (“CODM”) in deciding how to allocate resources and in assessing performance. Emerald’s Chief Executive Officer (“CEO”) was appointed in January 2021 and is considered the CODM. Effective January 31, 2022, Emerald’s CEO changed the way that he evaluates the results of the Company’s operations and as a result, there was a change in reporting segments. The CODM evaluates performance based on the results of seven executive portfolios, which represent the Company’s seven operating segments. Based on an evaluation of economic similarities, five operating segments are aggregated into two reportable segments: "Commerce" and "Design, Creative and Technology" reportable segments. Two operating segments do not meet the quantitative thresholds of a reportable operating segment and did not meet the aggregation criteria set forth in Accounting Standards Codification 280 (“ASC 280”), Segment Reporting, as of September 30, 2022 and as such are referred to as “All Other.” Refer to Note 15, Segment Information , for information regarding the Company’s reportable segments.
Recently Adopted Accounting Pronouncements and Recently Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In October 2021, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard (“ASU”) 2021-08 (“ASU 2021-08”), Accounting for Contract Assets and Contract Liabilities from Contracts with Customers, creating an exception to the recognition and measurement principles in ASC 805, Business Combinations. The amendments require an acquirer to use the guidance in ASC 606, Revenue from Contracts with Customers, rather than using fair value, when recognizing and measuring contract assets and contract liabilities related to customer contracts assumed in a business combination. This guidance is effective for fiscal years beginning after December 15, 2022, and for interim periods within that year. Early adoption is permitted and the amendments in ASU 2021-08 should be applied to business combinations occurring during the year of adoption. The Company adopted ASU 2021-08 in October 2021 and the adoption did no t have a material impact on the Company’s consolidated financial statements. In December 2019, the Financial Accounting Standards Board (“FASB”) issued Accounting Standard Update (“ASU”) 2019-12, Income Taxes (Topic 740) Simplifying the Accounting for Income Taxes (“ASU 2019-12”). ASU 2019-12 simplifies the accounting for income taxes by removing certain exceptions and adding further guidance to simplify the accounting for income taxes. The standard removes certain exceptions related to intra-period tax allocations, the methodology for calculating income taxes in interim periods and the recognition of deferred taxes for investments. The standard also clarifies and amends existing guidance to reduce complexity in certain areas, including recognizing deferred taxes for tax goodwill and allocating taxes to members of a consolidated group. The Company adopted ASU 2019-12 on January 1, 2021 , which did no t have a material impact on the Company’s condensed consolidated financial statements. Recently Issued Accounting Pronouncements In March 2020, the FASB issued ASU 2020-04, Reference Rate Reform (Topic 848) Facilitation of the Effects of Reference Rate Reform on Financial Reporting (“ASU 2020-04”). ASU 2020-04 provides optional guidance for a limited period of time to ease the potential burden of accounting for (or recognizing the effects of) reference rate reform. The amendments in ASU 2020-04 are effective upon issuance through December 31, 2022 and may be applied prospectively to contract modifications made and hedging relationships entered into on or before December 31, 2022. The Company does not expect the adoption of this accounting standard will have a material impact on the Company’s condensed consolidated financial statements. There have been no other new accounting pronouncements that are expected to have a significant impact on the Company’s condensed consolidated financial statements or notes thereto.
Revenue Recognition and Deferred Revenue	Impact of COVID-19 The global COVID-19 pandemic significantly impacted the Company’s revenues from mid-March 2020 through the end of fiscal year 2021. Late in the second quarter of 2021, the Company began to see the positive impacts of successful vaccination rollouts throughout the United States, with social distancing restrictions easing and live events resuming. As a result, the Company was able to hold 84 in-person events during the first nine months of 2022. Revenue Recognition and Deferred Revenue Revenue is recognized as the customer receives the benefit of the promised services and performance obligations are satisfied. Revenue is recognized at an amount that reflects the consideration the Company expects to receive in exchange for those services. Customers generally receive the benefit of the Company’s services upon the staging of each trade show or conference event and over the subscription period for access to the Company’s subscription software and services. A significant portion of the Company’s annual revenue is generated from the production of trade shows and other events, including booth space sales, registration fees and sponsorship fees. Trade show revenues and other events represented 79.8 % and 85.4 % of total revenues for the three months ended September 30, 2022 and 2021, respectively. Trade show and other event revenues represented 84.9 % and 71.6 % of total revenues for the nine months ended September 30, 2022 and 2021, respectively. Deferred revenues generally consist of booth space sales, registration fees and sponsorship fees that are invoiced prior to a trade show, as well as upfront payments for software subscription fees, professional services and implementation fees for the Company’s subscription software and services. Current deferred revenues were $ 166.7 million as of September 30, 2022 and are reported as deferred revenues on the condensed consolidated balance sheets. Long-term deferred revenues as of September 30, 2022 were $ 1.7 million and are reported as other noncurrent liabilities on the condensed consolidated balance sheets. Current and long-term deferred revenues as of December 31, 2021 were $ 118.1 million and $ 0.2 million, respectively. During the three and nine months ended September 30, 2022 , the Company recognized revenues of $ 54.5 million and $ 198.4 million, respectively, from amounts included in deferred revenue at the beginning of the respective period. During the three and nine months ended September 30, 2021 , the Company recognized revenues of $ 76.7 million and $ 91.4 million, respectively, from amounts included in deferred revenue at the beginning of the respective period. The accounts receivable and deferred revenue balances related to cancelled events have been reclassified to cancelled event liabilities in the condensed consolidated balance sheets as the total amount represents balances which are expected to be refunded to customers. As of September 30, 2022, cancelled event liabilities of $ 4.4 million represents $ 3.2 million of deferred revenues for cancelled trade shows and $ 1.2 million of related accounts receivable reclassified to cancelled event liabilities in the condensed consolidated balance sheets. As of December 31, 2021, cancelled event liabilities of $ 9.8 million represents $ 5.6 million of deferred revenues for cancelled trade shows and $ 4.2 million of related accounts receivable reclassified to cancelled event liabilities in the condensed consolidated balance sheets. Performance Obligations For the Company’s trade shows and other events, sales are deferred and recognized when performance obligations under the terms of a contract with the Company’s customers are satisfied, which is typically at the completion of a show or event. Revenue is measured as the amount of consideration the Company expects to receive upon completion of its performance obligations. For the Company’s subscription software and services, the Company enters into contracts with customers that often include multiple performance obligations, which are generally capable of being distinct. Fees associated with implementation and professional services are deferred and recognized over the expected customer life, which is four years . Subscription revenue is generally recognized over the term of the contract. The Company’s contracts associated with the subscription software and services are typically three-year terms with one-year renewals following the initial three-year term. For the Company’s other marketing services, revenues are deferred and recognized when performance obligations under the terms of a contract with the Company’s customers are satisfied. This generally occurs in the period in which the publications are issued. Revenue is measured as the amount of consideration the Company expects to receive upon completion of its performance obligations. The Company applies a practical expedient which allows the exclusion of disclosure information regarding remaining performance obligations if the performance obligation is part of a contract that has an expected duration of one year or less. The Company’s performance obligations greater than one year are immaterial. Disaggregation of Revenue The Company’s primary sources of revenue are from trade shows, other events, subscription software and services and other marketing services. The following table represents revenues disaggregated by type: Reportable Segment Commerce (1) Design, (1) All Other (1) Total Three Months Ended September 30, 2022 (in millions) Trade shows $ 32.1 $ 4.6 $ 0.9 $ 37.6 Other events 0.1 11.3 0.8 12.2 Subscription software and services 0.1 0.7 3.8 4.6 Other marketing services 1.6 6.4 — 8.0 Total revenues $ 33.9 $ 23.0 $ 5.5 $ 62.4 Three Months Ended September 30, 2021 Trade shows $ 37.3 $ 19.1 $ — $ 56.4 Other events 0.2 8.7 — 8.9 Subscription software and services — 0.8 2.9 3.7 Other marketing services 1.3 6.2 — 7.5 Total revenues $ 38.8 $ 34.8 $ 2.9 $ 76.5 Nine Months Ended September 30, 2022 Trade shows $ 104.3 $ 60.0 $ 2.4 $ 166.7 Other events 0.6 29.2 0.8 30.6 Subscription software and services 0.1 2.3 10.7 13.1 Other marketing services 5.3 16.6 — 21.9 Total revenues $ 110.3 $ 108.1 $ 13.9 $ 232.3 Nine Months Ended September 30, 2021 Trade shows $ 42.9 $ 19.1 $ — $ 62.0 Other events 1.7 11.1 — 12.8 Subscription software and services — 1.3 8.1 9.4 Other marketing services 3.7 16.5 — 20.2 Total revenues $ 48.3 $ 48.0 $ 8.1 $ 104.4 (1) Current year segment disclosures reflect the new reportable segment structure Contract Balances The Company’s contract assets are primarily sales commissions incurred in connection with the Company’s subscription software and services, which are expensed over the expected customer relationship period. As of September 30, 2022, the Company does not have material contract assets. Contract liabilities generally consist of booth space sales, registration fees, sponsorship fees that are collected prior to the trade show or other event and subscription revenue, implementation fees and professional services associated with the Company’s subscription software and services. Contract liabilities less than one year from the date of the performance obligation are reported on the condensed consolidated balance sheets as deferred revenues. Contract liabilities greater than one year from the date of the performance obligation are reported on the condensed consolidated balance sheets in other noncurrent liabilities. The Company’s sales commission costs incurred in connection with sales of booth space, registration fees and sponsorship fees at the Company’s trade shows and other events and with sales of advertising for industry publications are generally short term, as sales typically begin up to one year prior to the date of the trade shows and other events. The Company expects the period benefited by each commission to be less than one year , and as a result, the Company expenses sales commissions associated with trade shows, other events and other marketing services as incurred. Sales commissions are reported on the condensed consolidated statements of income (loss) and comprehensive income (loss) as selling, general and administrative expense. Accounts Receivable The Company monitors collections and payments from its customers and maintains an allowance based upon applying an expected credit loss rate to receivables based on the historical loss rate from similar higher risk customers adjusted for current conditions, including any specific customer collection issues identified, and forecasts of economic conditions. Delinquent account balances are written off after management has determined that the likelihood of collection is remote. The activities in this account, including the current-period provision for expected credit losses for the three and nine months ended September 30, 2022 and 2021 , were not material.

Basis of Presentation (Tables)

Basis of Presentation (Tables)	9 Months Ended
	Sep. 30, 2022
Organization Consolidation And Presentation Of Financial Statements [Abstract]
Revision of Consolidated Financial Statements	The following tables reflect the impact of the revision to the specific line items presented in the Company’s previously reported consolidated financial statements as of and for the year ended December 31, 2021 (dollars in millions, share data in thousands except earnings per share and share par value): Consolidated Balance Sheet December 31, 2021 (dollars in millions, share data in thousands, except par value) As Originally Adjustments As Revised Liabilities, Redeemable Convertible Preferred Stock and Stockholders’ Deficit Current liabilities Accounts payable and other current liabilities $ 46.7 $ 1.6 $ 48.3 Total current liabilities 190.1 1.6 191.7 Total liabilities 747.9 1.6 749.5 Accumulated deficit ( 773.3 ) ( 1.6 ) ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Total liabilities, redeemable convertible preferred $ 1,062.4 — $ 1,062.4 Year ended December 31, 2021 Consolidated Statements of Income (Loss) and As Originally Adjustments As Revised (dollars in millions, share data in thousands except earnings per share) Cost of revenues 55.5 1.6 57.1 Operating loss ( 63.1 ) ( 1.6 ) ( 64.7 ) Loss before income taxes ( 79.4 ) ( 1.6 ) ( 81.0 ) Net loss and comprehensive loss ( 78.1 ) ( 1.6 ) ( 79.7 ) Net loss and comprehensive loss attributable $ ( 113.7 ) $ ( 1.6 ) $ ( 115.3 ) Basic loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Diluted loss per share $ ( 1.59 ) $ ( 0.03 ) $ ( 1.62 ) Basic weighted average common shares outstanding 71,309 71,309 71,309 Diluted weighted average common shares outstanding 71,309 71,309 71,309 Year ended December 31, 2021 Consolidated Statement of Redeemable Convertible As Originally Adjustments As Revised (in millions) Net loss and comprehensive loss attributable to: Accumulated deficit $ ( 773.3 ) $ ( 1.6 ) $ ( 774.9 ) Total stockholders’ deficit ( 119.4 ) ( 1.6 ) ( 121.0 ) Consolidated Statement of Cash Flows Year ended December 31, 2021 (in millions) As Originally Adjustments As Revised Operating activities Net loss $ ( 78.1 ) $ ( 1.6 ) $ ( 79.7 ) Changes in operating assets and liabilities: Accounts payable and other current liabilities 19.2 1.6 20.8 Net cash provided by operating activities 90.0 — 90.0 There was no impact on cash flows from investing or financing activities. The accompanying applicable Notes have been updated to reflect the revision for the year ended December 31, 2021.

Revenues (Tables)

Revenues (Tables)	9 Months Ended
	Sep. 30, 2022
Revenue From Contract With Customer [Abstract]
Summary of Revenues Disaggregated	The following table represents revenues disaggregated by type: Reportable Segment Commerce (1) Design, (1) All Other (1) Total Three Months Ended September 30, 2022 (in millions) Trade shows $ 32.1 $ 4.6 $ 0.9 $ 37.6 Other events 0.1 11.3 0.8 12.2 Subscription software and services 0.1 0.7 3.8 4.6 Other marketing services 1.6 6.4 — 8.0 Total revenues $ 33.9 $ 23.0 $ 5.5 $ 62.4 Three Months Ended September 30, 2021 Trade shows $ 37.3 $ 19.1 $ — $ 56.4 Other events 0.2 8.7 — 8.9 Subscription software and services — 0.8 2.9 3.7 Other marketing services 1.3 6.2 — 7.5 Total revenues $ 38.8 $ 34.8 $ 2.9 $ 76.5 Nine Months Ended September 30, 2022 Trade shows $ 104.3 $ 60.0 $ 2.4 $ 166.7 Other events 0.6 29.2 0.8 30.6 Subscription software and services 0.1 2.3 10.7 13.1 Other marketing services 5.3 16.6 — 21.9 Total revenues $ 110.3 $ 108.1 $ 13.9 $ 232.3 Nine Months Ended September 30, 2021 Trade shows $ 42.9 $ 19.1 $ — $ 62.0 Other events 1.7 11.1 — 12.8 Subscription software and services — 1.3 8.1 9.4 Other marketing services 3.7 16.5 — 20.2 Total revenues $ 48.3 $ 48.0 $ 8.1 $ 104.4 (1) Current year segment disclosures reflect the new reportable segment structure

Business Acquisitions (Tables)

Business Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2022
Schedule of Supplemental Pro-Forma Information	Supplemental information on an unaudited pro-forma basis, is reflected as if each of the 2022 acquisitions had occurred at the beginning of 2021, after giving effect to certain pro-forma adjustments primarily related to the amortization of acquired intangible assets and interest expense. The unaudited pro-forma supplemental information is based on estimates and assumptions that the Company believes are reasonable and reflects amortization of intangible assets as a result of the acquisitions. The supplemental unaudited pro-forma financial information is presented for comparative purposes only. It is not necessarily indicative of what the Company’s financial position or results of operations actually would have been had the Company completed the acquisitions at the dates indicated, nor is it intended to project the future financial position or operating results of the combined Company. Further, the supplemental pro-forma information has not been adjusted for show timing differences or discontinued events. Three Months Ended Nine Months Ended 2022 2022 (in millions) (Unaudited) Pro-forma revenues (1) Advertising Week $ — $ 5.5 Emerald revenue 62.4 232.3 Total pro-forma revenues $ 62.4 $ 237.8 Pro-forma net income Advertising Week $ — $ ( 0.7 ) Bulletin — ( 2.1 ) Emerald net income 93.0 108.4 Total pro-forma net income $ 93.0 $ 105.6 (1) Pro-forma revenues from the Bulletin acquisition were not material to the three and nine months ended September 30, 2022. Three Months Ended Nine Months Ended 2021 2021 (in millions) (Unaudited) Pro-forma revenues (1) Advertising Week $ 0.2 $ 3.0 MJBiz 0.7 1.8 Sue Bryce Education and The Portrait Masters — 1.0 Emerald revenue 76.5 104.4 Total pro-forma revenues $ 77.4 $ 110.2 Pro-forma net (loss) income Advertising Week $ ( 0.7 ) $ ( 1.0 ) Bulletin ( 1.3 ) ( 2.4 ) MJBiz ( 3.5 ) ( 10.6 ) Sue Bryce Education and The Portrait Masters — 0.3 Emerald net loss ( 9.0 ) ( 70.8 ) Total pro-forma net loss $ ( 14.5 ) $ ( 84.5 ) (1) Pro-forma revenues from the Bulletin acquisition were not material to the three and nine months ended September 30, 2021.
Bulletin Inc [Member]
Summary of Purchase Price Allocation and Measurement Period Adjustment	The following table summarizes the preliminary fair value of the acquired assets and liabilities on the acquisition date: (in millions) July 11, Trade receivables and prepaid expenses $ 0.4 Goodwill 7.9 Intangible assets 2.1 Accounts payable and other current liabilities ( 0.5 ) Purchase price $ 9.9
Advertising Week [Member]
Summary of Purchase Price Allocation and Measurement Period Adjustment	The following table summarizes the preliminary fair value of the acquired assets and liabilities on the acquisition date: (in millions) June 21, Trade and other receivables $ 3.8 Prepaid expenses and other current assets 0.3 Goodwill 23.6 Intangible assets 12.4 Right-of-use lease asset 1.2 Accounts payable and other current liabilities ( 2.7 ) Deferred revenues ( 3.1 ) Right-of-use lease liability ( 1.2 ) Purchase price $ 34.3
MJ Biz [Member]
Summary of Purchase Price Allocation and Measurement Period Adjustment	The Company’s purchase price allocation and measurement period adjustment for the MJBiz acquisition is presented below: (in millions) Fair Value Non-Cash (1) Fair Value Trade and other receivables $ 0.6 $ — $ 0.6 Prepaid expenses 0.1 — 0.1 Goodwill 113.8 6.0 119.8 Intangible Assets 30.4 2.9 33.3 Deferred Revenues ( 1.3 ) — ( 1.3 ) Other current liabilities ( 1.4 ) — ( 1.4 ) Purchase price $ 142.2 $ 8.9 $ 151.1 (1) During the first quarter of 2022, the Company recorded a non-cash adjustment to reflect a measurement period adjustment. Upon finalizing the analysis of the average EBITDA growth estimate, including gaining a better understanding of historical MJBizCon registration revenue trends, the estimated contingent consideration liability increased by $ 8.9 million, from approximately $ 24.0 million to $ 32.9 million. Such change resulted in an increase to Goodwill of $ 6.0 million and an increase in Intangible Assets of $ 2.9 million in the Commerce reportable segment.

Property and Equipment (Tables)

Property and Equipment (Tables)	9 Months Ended
	Sep. 30, 2022
Property Plant And Equipment [Abstract]
Summary of Property and Equipment, Net	Property and equipment, net, consisted of the following: (in millions) September 30, December 31, Furniture, equipment and other $ 8.0 $ 6.5 Leasehold improvements 3.2 3.1 11.2 9.6 Less: Accumulated depreciation ( 7.2 ) ( 5.9 ) Property and equipment, net $ 4.0 $ 3.7

Intangible Assets and Goodwill

Intangible Assets and Goodwill (Tables)	9 Months Ended
	Sep. 30, 2022
Goodwill And Intangible Assets Disclosure [Abstract]
Summary of Intangible Assets, Net	Intangible assets, net consisted of the following: (in millions) Indefinite- Customer Definite- Acquired Acquired Computer Capitalized Total Gross carrying $ 52.6 $ 362.9 $ 90.1 $ 8.4 $ 2.7 $ 23.3 $ 1.8 $ 541.8 Accumulated — ( 294.7 ) ( 16.0 ) ( 1.8 ) ( 0.5 ) ( 12.1 ) — ( 325.1 ) Net carrying $ 52.6 $ 68.2 $ 74.1 $ 6.6 $ 2.2 $ 11.2 $ 1.8 $ 216.7 Gross carrying $ 54.2 $ 354.3 $ 84.2 $ 6.2 $ 1.5 $ 13.8 $ 5.9 $ 520.1 Accumulated — $ ( 259.4 ) $ ( 12.2 ) ( 0.9 ) ( 0.2 ) $ ( 10.7 ) — ( 283.4 ) Net carrying $ 54.2 $ 94.9 $ 72.0 $ 5.3 $ 1.3 $ 3.1 $ 5.9 $ 236.7
Summary of Estimated Future Amortization Expense	Estimated future amortization expense as of September 30, 2022: (in millions) September 30, 2022 $ 14.0 2023 38.9 2024 20.6 2025 15.6 2026 11.3 Thereafter 58.1 $ 158.5
Schedule of Changes in Carrying Amount of Goodwill	The table below summarizes the changes in the carrying amount of goodwill: Reportable Segment (in millions) Commerce Commerce Design & Design, All Other Total Balance at December 31, 2021 $ 337.5 $ — $ 133.7 $ — $ 43.0 $ 514.2 Acquired goodwill — 7.9 — 23.6 — 31.5 Transfers ( 337.5 ) 342.2 ( 133.7 ) 142.9 ( 13.9 ) — Impairments — — ( 5.8 ) ( 0.5 ) ( 6.3 ) Measurement period adjustment — 6.0 — 0.1 — 6.1 Balance at September 30, 2022 $ — $ 356.1 $ — $ 160.8 $ 28.6 $ 545.5

Debt (Tables)

Debt (Tables)	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Summary of Long-Term Debt Related to Amended and Restated Term Loan Facility	Long-term debt related to the Amended and Restated Term Loan Facility is comprised of the following indebtedness to various lenders: (in millions) September 30, December 31, Amended and Restated Term Loan Facility, with 2.50 as of September 30, 2022, 5.27 % and 2.59 % at September 30, 2022 and December 31, 2024 , net (a) $ 513.3 $ 516.6 Less: Current maturities 5.7 5.7 Long-term debt, net of current maturities, debt $ 507.6 $ 510.9 (a) The Amended and Restated Term Loan Facility, a seven-year $ 565.0 million senior secured term loan facility, scheduled to mature on May 22, 2024 (the “Amended and Restated Term Loan Facility”), as of September 30, 2022 was recorded net of unamortized discount of $ 1.0 million and net of unamortized deferred financing fees of $ 1.3 million. The Amended and Restated Term Loan Facility as of December 31, 2021 was recorded net of unamortized discount of $ 1.4 million and net of unamortized deferred financing fees of $ 1.7 million. The fair market value of the Company’s debt under the Amended and Restated Term Loan Facility was $ 496.7 million as of September 30, 2022 .
Summary of Interest Expense	Interest expense reported in the condensed consolidated statements of income (loss) and comprehensive income (loss) consists of the following: Three Months Ended Nine Months Ended (in millions) 2022 2021 2022 2021 Senior secured term loan $ 6.4 $ 3.4 $ 14.1 $ 10.4 Non-cash interest for amortization of debt discount 0.3 0.3 1.0 1.1 Revolving credit facility interest and commitment fees 0.1 0.2 0.4 0.5 Total interest expense $ 6.8 $ 3.9 $ 15.5 $ 12.0

Fair Value Measurements and F_2

Fair Value Measurements and Financial Risk (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Financial Assets and Liabilities Measured at Fair Value on Recurring Basis	As of September 30, 2022, the Company’s assets and liabilities measured at fair value on a recurring basis other-than-temporary are categorized in the table below: (in millions) Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents $ 175.3 $ 175.3 $ — $ — Certificates of deposits (a) 99.9 — 99.9 — Money market mutual funds (b) 90.9 90.9 — — Total assets at fair value $ 366.1 $ 266.2 $ 99.9 $ — Liabilities Market-based share awards liability (c) $ 0.4 $ — $ — $ 0.4 Contingent consideration (c) 36.3 — — 36.3 Total liabilities at fair value $ 36.7 $ — $ — $ 36.7 (a) The Company’s certificates of deposits of $ 99.9 million as of September 30, 2022 are included within cash and cash equivalents in the condensed consolidated balance sheets. The certificates of deposits with maturities of 90 days or less are not traded in active markets and are classified as Level 2 assets. The certificates of deposits with maturities of 90 days or less are reported at fair values of these assets as of the reporting date. (b) The Company’s money market mutual funds of $ 90.9 million as of September 30, 2022 are included within cash and cash equivalents in the condensed consolidated balance sheets. The money market mutual funds are traded in active markets and quoted in broker or dealer quotations and are classified as Level 1 assets. The fair value of the Company’s money market mutual funds are based on unadjusted quoted prices on the reporting date. (c) The market-based share awards liability of $ 0.4 million as of September 30, 2022 is included within other noncurrent liabilities in the condensed consolidated balance sheet. The fair value of the Company’s market-based share awards and contingent consideration are derived from valuation techniques in which one or more significant inputs are unobservable, including the Company’s own assumptions. Contingent consideration of $ 28.5 million as of September 30, 2022 is included within Contingent consideration in the condensed consolidated balance sheets and Contingent consideration of $ 7.8 million is included within other noncurrent liabilities in the condensed consolidated balance sheets. As of December 31, 2021, the Company’s assets and liabilities measured at fair value on a recurring basis are categorized in the table below: (in millions) Total Level 1 Level 2 Level 3 Assets Cash and cash equivalents: Cash and cash equivalents $ 21.5 $ 21.5 $ — $ — Money market mutual funds (a) 209.7 209.7 — — Total assets at fair value $ 231.2 $ 231.2 $ — $ — Liabilities Market-based share awards liability (b) $ 0.4 $ — $ — $ 0.4 Contingent consideration (b) 36.2 — — 36.2 Total liabilities at fair value $ 36.6 $ — $ — $ 36.6 (a) The Company’s money market mutual funds are based on the closing price of these assets as of the reporting date. The fair value of the Company’s money market mutual funds are based on unadjusted quoted prices on the reporting date. The Company’s money market mutual funds are quoted in an active market and classified as Level 1 assets. (b) Included within other noncurrent liabilities in the condensed consolidated balance sheet. The fair value of the Company’s market-based share awards and contingent consideration are derived from valuation techniques in which one or more significant inputs are unobservable, including the Company’s own assumptions.

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2022
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Schedule of Stock Option Activity	Stock option activity for the nine months ended September 30, 2022, was as follows: Weighted-Average Number of Exercise Price Remaining Aggregate (thousands) (years) (millions) Outstanding at December 31, 2021 14,403 $ 8.10 8.1 $ — Granted 575 5.66 Exercised Forfeited ( 523 ) 10.18 Outstanding at September 30, 2022 14,455 $ 7.93 7.5 $ — Exercisable at September 30, 2022 4,845 $ 10.97 5.8 $ —
Schedule of Restricted Stock Units Activity	RSU activity for the three months ended September 30, 2022 was as follows: (share data in thousands, except per share data) Number of Weighted Unvested balance, December 31, 2021 1,358 $ 8.13 Granted 126 3.58 Forfeited ( 47 ) 10.72 Vested ( 504 ) 8.73 Unvested balance, September 30, 2022 933 $ 7.05
Schedule of Assumptions Used in Determining Fair Value Performance-based Market Condition Share Awards Outstanding	The assumptions used in determining the fair value for the performance-based market condition share awards outstanding at September 30, 2022 were as follows: September 30, Expected volatility 57.50 % Dividend yield 0.00 % Risk-free interest rate 3.97 % Weighted-average expected term (in years) 4.5

Earnings Per Share (Tables)

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Computation of Basic and Diluted Earnings Per Common Share	The details of the computation of basic and diluted earnings per common share are as follows: Three Months Ended Nine Months Ended (dollars in millions, share data in thousands except earnings per share) 2022 2021 2022 2021 Net income (loss) and comprehensive income (loss) $ 93.0 $ ( 9.0 ) $ 108.4 $ ( 70.8 ) Accretion to redemption value of redeemable ( 9.9 ) ( 9.0 ) ( 28.7 ) ( 26.3 ) Participation rights on if-converted basis ( 54.7 ) — ( 51.9 ) — Net income (loss) and comprehensive income (loss) $ 28.4 $ ( 18.0 ) $ 27.8 $ ( 97.1 ) Weighted average common shares outstanding 68,433 71,033 69,479 71,719 Basic income (loss) per share $ 0.42 $ ( 0.25 ) $ 0.40 $ ( 1.35 ) Net income (loss) and comprehensive income (loss) $ 28.4 $ ( 18.0 ) $ 27.8 $ ( 97.1 ) Diluted weighted average common shares 68,643 71,033 69,588 71,719 Diluted income (loss) per share $ 0.41 $ ( 0.25 ) $ 0.40 $ ( 1.35 ) Anti-dilutive employee share awards excluded 14,455 1,259 14,814 14,911

Accounts Payable and Other Cu_2

Accounts Payable and Other Current Liabilities (Tables)	9 Months Ended
	Sep. 30, 2022
Payables And Accruals [Abstract]
Schedule of Accounts Payable and Other Current Liabilities	Accounts payable and other current liabilities consisted of the following: (in millions) September 30, December 31, Accrued event costs $ 11.5 $ 9.5 Accrued personnel costs 19.6 16.0 Trade payables 16.8 12.0 Other current liabilities 17.1 10.8 Total accounts payable and other $ 65.0 $ 48.3

Segment Information (Tables)

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2022
Segment Reporting [Abstract]
Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net Income (Loss)	The following table presents a reconciliation of reportable segment revenues, other income, net, and Adjusted EBITDA to net income (loss): Three Months Ended Nine Months Ended (in millions) 2022 2021 (1) 2022 2021 (1) Revenues Commerce $ 33.9 $ 38.8 $ 110.3 $ 48.3 Design, Creative, and Technology 23.0 34.8 108.1 48.0 All Other 5.5 2.9 13.9 8.1 Total revenues $ 62.4 $ 76.5 $ 232.3 $ 104.4 Other Income, net Commerce $ 2.4 $ 1.1 $ 8.0 $ 7.8 Design, Creative, and Technology — — 25.3 9.2 All Other — — 0.9 0.5 Total other income, net $ 2.4 $ 1.1 $ 34.2 $ 17.5 Adjusted EBITDA Commerce $ 16.0 $ 17.2 $ 57.6 $ 19.9 Design, Creative, and Technology 2.5 4.2 57.0 7.3 All Other ( 3.1 ) ( 0.5 ) ( 8.1 ) ( 0.1 ) Subtotal Adjusted EBITDA $ 15.4 $ 20.9 $ 106.5 $ 27.1 General corporate and other expenses $ ( 14.3 ) $ ( 11.5 ) $ ( 40.6 ) $ ( 34.0 ) Other Income, net (2) 148.6 — 148.6 — Interest expense, net ( 6.0 ) ( 3.9 ) ( 14.4 ) ( 12.0 ) Goodwill impairment charge — — ( 6.3 ) — Intangible asset impairment charge — — ( 1.6 ) — Depreciation and amortization expense ( 14.7 ) ( 12.2 ) ( 43.0 ) ( 36.1 ) Stock-based compensation expense ( 1.3 ) ( 2.4 ) ( 5.0 ) ( 8.2 ) Deferred revenue adjustment ( 0.2 ) ( 0.3 ) ( 0.6 ) ( 1.4 ) Other items ( 6.3 ) ( 1.6 ) ( 4.9 ) ( 5.6 ) Income (loss) before income taxes $ 121.2 $ ( 11.0 ) $ 138.7 $ ( 70.2 ) (1) Segment disclosures for the current and prior year reflect the new reportable segment structure. (2) On August 3, 2022, the Company reached an agreement for a one-time settlement of outstanding insurance litigation relating to event cancellation insurance for proceeds of $ 148.6 million. The one-time settlement payment was not specifically attributable to any of the Company's outstanding event cancellation insurance claims and therefore was not recorded at the segment level. The other income, net related to this one-time settlement is not indicative of any one segment's performance and is not included in the measure of segment profit and loss analyzed by the CODM on a regular basis.

Basis of Presentation - Additio

Basis of Presentation - Additional Information (Detail)		3 Months Ended			6 Months Ended	9 Months Ended		12 Months Ended
	Aug. 03, 2022 USD ($)	Sep. 30, 2022 USD ($)	Dec. 31, 2021 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($) Event Exhibitingcompany Attendee	Sep. 30, 2022 USD ($) Segment Attendee Exhibitingcompany Event Portfolio	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Proceeds from insurance								$ 1,600,000
Cost of revenues		$ 22,700,000		$ 33,700,000		$ 83,300,000	$ 41,300,000	57,100,000
Accounts payable and other current liabilities		65,000,000	$ 48,300,000		$ 48,300,000	65,000,000		48,300,000
Cash and cash equivalents		366,100,000	231,200,000		231,200,000	366,100,000		231,200,000
Marketable securities				0			0
Proceeds from maturity of marketable securities		50,000,000				$ 50,000,000
Unrealized holding gains or losses on marketable securities		0					0
Number of operating segments, aggregated into reportable segments | Segment						5
Number of reportable segments | Segment						2
Number of additional operating segments that do not meet quantitative thresholds for reporting segment | Segment						2
Chief Operating Decision Maker [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of executive portfolios | Portfolio						7
Number of operating segment | Segment						7
Amended and Restated Term Loan Facility [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Borrowings outstanding		515,300,000				$ 515,300,000
Revolving Credit Facility [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Borrowings outstanding		0	0		$ 0	$ 0		0
COVID-19 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Number of in-person events | Event					56	84
Number of serving attendees | Attendee					129,000	282,300
Number of exhibiting companies | Exhibitingcompany					7,500	13,300
Insurance litigation settlement proceeds relating to event cancellation	$ 148,600,000
Other income from insurance settlement		151,000,000		$ 1,100,000		$ 182,800,000	$ 17,500,000
Insurance receivables		$ 100,000,000				100,000,000
COVID-19 [Member] | Surf Expo Winter 2022 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Insurance policy, coverage limit						8,400,000
COVID-19 [Member] | Surf Expo Summer 2022 [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Insurance policy, coverage limit						$ 6,500,000
Adjustments [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Cost of revenues			1,600,000					1,600,000
Accounts payable and other current liabilities			$ 1,600,000		$ 1,600,000			$ 1,600,000

Basis of Presentation - Consoli

Basis of Presentation - Consolidated Balance Sheet (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Current liabilities
Accounts payable and other current liabilities	$ 65		$ 48.3
Total current liabilities	303.2		191.7
Total liabilities	834.5		749.5
Accumulated deficit	(666.5)		(774.9)
Total stockholders’ deficit	(46.1)	$ (124.8)	(121)	$ (103.5)	$ (82.4)	$ (3.8)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit	$ 1,250.8		1,062.4
As Originally Reported [Member]
Current liabilities
Accounts payable and other current liabilities			46.7
Total current liabilities			190.1
Total liabilities			747.9
Accumulated deficit			(773.3)
Total stockholders’ deficit			(119.4)
Total liabilities, redeemable convertible preferred stock and stockholders’ deficit			1,062.4
Adjustments [Member]
Current liabilities
Accounts payable and other current liabilities			1.6
Total current liabilities			1.6
Total liabilities			1.6
Accumulated deficit			(1.6)
Total stockholders’ deficit			$ (1.6)

Basis of Presentation - Condens

Basis of Presentation - Condensed Consolidated Statements of Income (Loss) and Comprehensive Income (Loss) (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Cost of revenues	$ 22.7		$ 33.7	$ 83.3	$ 41.3	$ 57.1
Operating loss	127.3		(7.1)	153.3	(58.2)	(64.7)
Loss before income taxes	121.2		(11)	138.7	(70.2)	(81)
Net loss and comprehensive loss	93		(9)	108.4	(70.8)	(79.7)
Net loss and comprehensive loss income attributable to Emerald Holding, Inc. common stockholders	$ 28.4		$ (18)	$ 27.8	$ (97.1)	$ (115.3)
Basic loss per share	$ 0.42		$ (0.25)	$ 0.40	$ (1.35)	$ (1.62)
Diluted loss per share	$ 0.41		$ (0.25)	$ 0.40	$ (1.35)	$ (1.62)
Basic weighted average common shares outstanding	68,433		71,033	69,479	71,719	71,309
Diluted weighted average common shares outstanding	68,643		71,033	69,588	71,719	71,309
As Originally Reported [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Cost of revenues						$ 55.5
Operating loss						(63.1)
Loss before income taxes						(79.4)
Net loss and comprehensive loss						(78.1)
Net loss and comprehensive loss income attributable to Emerald Holding, Inc. common stockholders						$ (113.7)
Basic loss per share						$ (1.59)
Diluted loss per share						$ (1.59)
Basic weighted average common shares outstanding						71,309
Diluted weighted average common shares outstanding						71,309
Adjustments [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Cost of revenues		$ 1.6				$ 1.6
Operating loss						(1.6)
Loss before income taxes						(1.6)
Net loss and comprehensive loss						(1.6)
Net loss and comprehensive loss income attributable to Emerald Holding, Inc. common stockholders						$ (1.6)
Basic loss per share						$ (0.03)
Diluted loss per share						$ (0.03)
Basic weighted average common shares outstanding						71,309
Diluted weighted average common shares outstanding						71,309

Basis of Presentation - Conde_2

Basis of Presentation - Condensed Consolidated Statements of Redeemable Convertible Preferred Stock and of Stockholders' Deficit (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit	$ (666.5)		$ (774.9)
Total stockholders’ deficit	$ (46.1)	$ (124.8)	(121)	$ (103.5)	$ (82.4)	$ (3.8)
As Originally Reported [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit			(773.3)
Total stockholders’ deficit			(119.4)
Adjustments [Member]
Description Of Business And Summary Of Significant Accounting Policies [Line Items]
Accumulated deficit			(1.6)
Total stockholders’ deficit			$ (1.6)

Basis of Presentation - Conso_2

Basis of Presentation - Consolidated Statement Of Cash Flows (Detail) - USD ($) $ in Millions	9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Operating activities
Net income (loss)	$ 108.4	$ (70.8)	$ (79.7)
Changes in operating assets and liabilities:
Accounts payable and other current liabilities	14.3	21.6	20.8
Net cash provided by operating activities	$ 198.7	$ 36.3	90
As Originally Reported [Member]
Operating activities
Net income (loss)			(78.1)
Changes in operating assets and liabilities:
Accounts payable and other current liabilities			19.2
Net cash provided by operating activities			90
Adjustments [Member]
Operating activities
Net income (loss)			(1.6)
Changes in operating assets and liabilities:
Accounts payable and other current liabilities			$ 1.6

Recent Accounting Pronounceme_2

Recent Accounting Pronouncements - Additional Information (Detail)	Sep. 30, 2022
ASU 2021-08 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Oct. 31, 2021
Change in accounting principle accounting standards update immaterial effect	true
ASU 2019-12 [Member]
New Accounting Pronouncements Or Change In Accounting Principle [Line Items]
Change in accounting principle, accounting standards update, adopted	true
Change in accounting principle, accounting standards update, adoption date	Jan. 01, 2021
Change in accounting principle accounting standards update immaterial effect	true

Revenues - Additional Informati

Revenues - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenue From Contract With Customer [Line Items]
Held events description			hold 84 in-person events during the first nine months
Current deferred revenues	$ 166.7		$ 166.7		$ 118.1
Revenue recognized	54.5	$ 76.7	198.4	$ 91.4
Cancelled event liabilities	4.4		$ 4.4		9.8
Maximum [Member]
Revenue From Contract With Customer [Line Items]
Contracts with customers sales beginning period			1 year
Contracts with customers commission benefited expected period			1 year
Other Noncurrent Liabilities [Member]
Revenue From Contract With Customer [Line Items]
Long-term deferred revenues	$ 1.7		$ 1.7		0.2
Trade Show and Other Events [Member] | Sales Revenue, Net [Member] | Customer Concentration Risk [Member]
Revenue From Contract With Customer [Line Items]
Concentration risk, percentage	79.80%	85.40%	84.90%	71.60%
Trade Shows [Member] | COVID-19 [Member]
Revenue From Contract With Customer [Line Items]
Current deferred revenues	$ 3.2		$ 3.2		5.6
Accounts receivable credits reclassified to cancelled event liabilities	$ 1.2		$ 1.2		$ 4.2

Revenues - Additional Informa_2

Revenues - Additional Information (Detail 1) - Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date: 2022-10-01	9 Months Ended
	Sep. 30, 2022
Maximum [Member]
Revenue From Contract With Customer [Line Items]
Revenue recognition of remaining performance obligations original expected period	1 year
Implementation Fees and Professional Services [Member]
Revenue From Contract With Customer [Line Items]
Revenue recognition of remaining performance obligations original expected period	4 years
Subscription Software and Services [Member]
Revenue From Contract With Customer [Line Items]
Revenue recognition of remaining performance obligations original expected period	3 years
Revenue recognition of remaining performance obligations expected renewal period	1 year

Revenues - Summary of Revenues

Revenues - Summary of Revenues Disaggregated (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation Of Revenue [Line Items]
Revenues	$ 62.4	$ 76.5	$ 232.3	$ 104.4
Trade Shows [Member]
Disaggregation Of Revenue [Line Items]
Revenues	37.6	56.4	166.7	62
Other Events [Member]
Disaggregation Of Revenue [Line Items]
Revenues	12.2	8.9	30.6	12.8
Subscription Software and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4.6	3.7	13.1	9.4
Other Marketing Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	8	7.5	21.9	20.2
Commerce [Member]
Disaggregation Of Revenue [Line Items]
Revenues	33.9	38.8	110.3	48.3
Commerce [Member] | Trade Shows [Member]
Disaggregation Of Revenue [Line Items]
Revenues	32.1	37.3	104.3	42.9
Commerce [Member] | Other Events [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.1	0.2	0.6	1.7
Commerce [Member] | Subscription Software and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.1		0.1
Commerce [Member] | Other Marketing Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	1.6	1.3	5.3	3.7
Design, Creative and Technology [Member]
Disaggregation Of Revenue [Line Items]
Revenues	23	34.8	108.1	48
Design, Creative and Technology [Member] | Trade Shows [Member]
Disaggregation Of Revenue [Line Items]
Revenues	4.6	19.1	60	19.1
Design, Creative and Technology [Member] | Other Events [Member]
Disaggregation Of Revenue [Line Items]
Revenues	11.3	8.7	29.2	11.1
Design, Creative and Technology [Member] | Subscription Software and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.7	0.8	2.3	1.3
Design, Creative and Technology [Member] | Other Marketing Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	6.4	6.2	16.6	16.5
All Other [Member]
Disaggregation Of Revenue [Line Items]
Revenues	5.5	2.9	13.9	8.1
All Other [Member] | Trade Shows [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.9		2.4
All Other [Member] | Other Events [Member]
Disaggregation Of Revenue [Line Items]
Revenues	0.8		0.8
All Other [Member] | Subscription Software and Services [Member]
Disaggregation Of Revenue [Line Items]
Revenues	$ 3.8	$ 2.9	$ 10.7	$ 8.1

Business Acquisitions - Additio

Business Acquisitions - Additional Information (Detail) - USD ($) $ in Millions			3 Months Ended	9 Months Ended
	Jul. 11, 2022	Jun. 21, 2022	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Contingent consideration on purchase price				$ 36.3	$ 36.2
Advertising Week [Member]
Business Acquisition [Line Items]
Purchase price		$ 34.3
Business acquisition, initial cash payment		28.4
Contingent consideration on purchase price		5.9
Intangible assets		12.4
Advertising Week [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition costs incurred		$ 0.6
Advertising Week [Member] | 2026 Payment [Member]
Business Acquisition [Line Items]
Business combination payment dependent upon compounded annual term		5 years
Advertising Week [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets		$ 5.4
Weighted-average amortization period		15 years
Assumed residual value		$ 0
Advertising Week [Member] | Customer Relationships Intangibles [Member]
Business Acquisition [Line Items]
Intangible assets		$ 5.9
Weighted-average amortization period		10 years
Assumed residual value		$ 0
Advertising Week [Member] | Content Intangible Assets [Member]
Business Acquisition [Line Items]
Intangible assets		$ 1.1
Weighted-average amortization period		7 years
Advertising Week [Member] | Estimated Fair Value [Member]
Business Acquisition [Line Items]
Contingent consideration on purchase price		$ 5.9
MJ Biz [Member]
Business Acquisition [Line Items]
Contingent consideration on purchase price			$ 32.9		$ 24
Intangible assets				33.3
Increase in contingent consideration liability			$ 8.9	$ 8.9
Bulletin Inc [Member]
Business Acquisition [Line Items]
Purchase price	$ 9.9
Business acquisition, initial cash payment	8.9
Contingent consideration on purchase price	1
Intangible assets	2.1
Bulletin Inc [Member] | Selling, General and Administrative Expenses [Member]
Business Acquisition [Line Items]
Acquisition costs incurred	1.1
Bulletin Inc [Member] | Acquired Technology [Member]
Business Acquisition [Line Items]
Intangible assets	$ 2
Weighted-average amortization period	3 years
Assumed residual value	$ 0
Bulletin Inc [Member] | Trade Names [Member]
Business Acquisition [Line Items]
Intangible assets	$ 0.1
Weighted-average amortization period	3 years
Assumed residual value	$ 0
Bulletin Inc [Member] | Estimated Fair Value [Member]
Business Acquisition [Line Items]
Contingent consideration on purchase price	$ 1

Business Acquisitions - Summary

Business Acquisitions - Summary of Purchase Price Allocation and Measurement Period Adjustment (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Jul. 11, 2022	Jun. 21, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Goodwill	$ 545.5			$ 514.2
Bulletin Inc [Member]
Business Acquisition [Line Items]
Trade receivables and prepaid expenses		$ 0.4
Goodwill		7.9
Intangible assets		2.1
Accounts payable and other current liabilities		(0.5)
Purchase price		$ 9.9
Advertising Week [Member]
Business Acquisition [Line Items]
Trade and other receivables			$ 3.8
Prepaid expenses and other current assets			0.3
Goodwill			23.6
Intangible assets			12.4
Right-of-use lease asset			1.2
Accounts payable and other current liabilities			(2.7)
Deferred revenues			(3.1)
Right-of-use lease liability			(1.2)
Purchase price			$ 34.3
MJ Biz [Member]
Business Acquisition [Line Items]
Trade and other receivables	0.6
Prepaid expenses and other current assets	0.1
Goodwill	119.8
Intangible assets	33.3
Accounts payable and other current liabilities	(1.3)
Deferred revenues	(1.4)
Purchase price	151.1
MJ Biz [Member] | As Originally Reported [Member]
Business Acquisition [Line Items]
Trade and other receivables				0.6
Prepaid expenses and other current assets				0.1
Goodwill				113.8
Intangible assets				30.4
Accounts payable and other current liabilities				(1.3)
Deferred revenues				(1.4)
Purchase price				$ 142.2
MJ Biz [Member] | Non-Cash Measurement Period Adjustment [Member]
Business Acquisition [Line Items]
Goodwill	6
Intangible assets	2.9
Purchase price	$ 8.9

Business Acquisitions - Summa_2

Business Acquisitions - Summary of Purchase Price Allocation and Measurement Period Adjustment (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Estimated contingent consideration liability		$ 36.3	$ 36.2
MJ Biz [Member]
Business Acquisition [Line Items]
Increase in contingent consideration liability	$ 8.9	$ 8.9
Estimated contingent consideration liability	32.9		$ 24
MJ Biz [Member] | Commerce [Member]
Business Acquisition [Line Items]
Increase to goodwill	6
Increase in intangible assets	$ 2.9

Business Acquisitions - Schedul

Business Acquisitions - Schedule of Supplemental Pro-Forma Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Total pro-forma revenues	$ 62.4	$ 77.4	$ 237.8	$ 110.2
Total pro-forma net income (loss)	93	(14.5)	105.6	(84.5)
Advertising Week [Member]
Business Acquisition [Line Items]
Total pro-forma revenues		0.2	5.5	3
Total pro-forma net income (loss)		(0.7)	(0.7)	(1)
Bulletin Inc [Member]
Business Acquisition [Line Items]
Total pro-forma net income (loss)		(1.3)	(2.1)	(2.4)
Emerald Revenue [Member]
Business Acquisition [Line Items]
Total pro-forma revenues	62.4	76.5	232.3	104.4
Emerald Net (Loss) Income [Member]
Business Acquisition [Line Items]
Total pro-forma net income (loss)	$ 93	(9)	$ 108.4	(70.8)
MJ Biz [Member]
Business Acquisition [Line Items]
Total pro-forma revenues		0.7		1.8
Total pro-forma net income (loss)		$ (3.5)		(10.6)
Sue Bryce Education and The Portrait Masters [Member]
Business Acquisition [Line Items]
Total pro-forma revenues				0.3
Total pro-forma net income (loss)				$ 1

Property and Equipment - Summar

Property and Equipment - Summary of Property and Equipment, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 11.2	$ 9.6
Less: Accumulated depreciation	(7.2)	(5.9)
Property and equipment, net	4	3.7
Furniture, Equipment and Other [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	8	6.5
Leasehold Improvements [Member]
Property Plant And Equipment [Line Items]
Property and equipment, gross	$ 3.2	$ 3.1

Property and Equipment - Additi

Property and Equipment - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Property Plant And Equipment [Abstract]
Depreciation expense related to property and equipment	$ 0.7	$ 0.4	$ 1.3	$ 1

Intangible Assets and Goodwil_2

Intangible Assets and Goodwill - Summary of Intangible Assets, Net (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	$ 541.8	$ 520.1
Accumulated amortization	(325.1)	(283.4)
Net carrying amount	216.7	236.7
Trade Names [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	52.6	54.2
Net carrying amount	52.6	54.2
Customer Relationships Intangibles [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	362.9	354.3
Accumulated amortization	(294.7)	(259.4)
Net carrying amount	68.2	94.9
Trade Names [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	90.1	84.2
Accumulated amortization	(16)	(12.2)
Net carrying amount	74.1	72
Acquired Technology [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	8.4	6.2
Accumulated amortization	(1.8)	(0.9)
Net carrying amount	6.6	5.3
Acquired Content [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	2.7	1.5
Accumulated amortization	(0.5)	(0.2)
Net carrying amount	2.2	1.3
Computer Software [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	23.3	13.8
Accumulated amortization	(12.1)	(10.7)
Net carrying amount	11.2	3.1
Capitalized Software in Progress [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Gross carrying amount	1.8	5.9
Net carrying amount	$ 1.8	$ 5.9

Intangible Assets and Goodwil_3

Intangible Assets and Goodwill - Additional Information (Detail)	3 Months Ended			9 Months Ended
	Sep. 30, 2022 USD ($)	Mar. 31, 2022 USD ($)	Sep. 30, 2021 USD ($)	Sep. 30, 2022 USD ($) Segment	Sep. 30, 2021 USD ($)	Oct. 31, 2021 USD ($)
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Amortization expense	$ 14,000,000		$ 11,800,000	$ 41,700,000	$ 35,100,000
Impairment of indefinite-lived intangible assets		$ 1,600,000		$ 1,600,000
Number of reporting units | Segment				1
Goodwill impairment charge	0	$ 6,300,000		$ 6,300,000
Fair value of goodwill	$ 3,100,000			$ 3,100,000		$ 214,600,000
Maximum [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Percentage of fair value of reporting unit exceeding carry value						5%
Estimated future net cash flows discounted rate	3%			3%
Weighted average cost of capital discount rate	15.50%			15.50%
Minimum [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Estimated future net cash flows discounted rate	0%			0%
Weighted average cost of capital discount rate	12.80%			12.80%
New Reporting Unit [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Number of reporting units | Segment				1
Goodwill impairment charge				$ 500,000
Design, Creative and Technology [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Impairment of indefinite-lived intangible assets				1,600,000
Goodwill impairment charge				5,800,000
All Other [Member]
Schedule Of Intangible Assets Excluding Goodwill [Line Items]
Goodwill impairment charge				$ 500,000

Intangible Assets and Goodwil_4

Intangible Assets and Goodwill - Summary of Estimated Future Amortization Expense (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Goodwill And Intangible Assets Disclosure [Abstract]
2022	$ 14
2023	38.9
2024	20.6
2025	15.6
2026	11.3
Thereafter	58.1
Estimated future amortization expense	$ 158.5

Intangible Assets and Goodwil_5

Intangible Assets and Goodwill - Schedule of Changes in Carrying Amount of Goodwill (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2022
Goodwill [Line Items]
Goodwill, balance		$ 514,200,000	$ 514,200,000
Acquired goodwill			31,500,000
Impairments	$ 0	(6,300,000)	(6,300,000)
Measurement period adjustment			6,100,000
Goodwill, balance	545,500,000		545,500,000
Commerce (Legacy) [Member]
Goodwill [Line Items]
Goodwill, balance		337,500,000	337,500,000
Transfers			(337,500,000)
Commerce [Member]
Goodwill [Line Items]
Acquired goodwill			7,900,000
Transfers			342,200,000
Measurement period adjustment			6,000,000
Goodwill, balance	356,100,000		356,100,000
Design, Creative and Technology [Member]
Goodwill [Line Items]
Acquired goodwill			23,600,000
Transfers			142,900,000
Impairments			(5,800,000)
Measurement period adjustment			100,000
Goodwill, balance	160,800,000		160,800,000
Design and Technology [Member]
Goodwill [Line Items]
Goodwill, balance		133,700,000	133,700,000
Transfers			(133,700,000)
All Other [Member]
Goodwill [Line Items]
Goodwill, balance		$ 43,000,000	43,000,000
Transfers			(13,900,000)
Impairments			(500,000)
Goodwill, balance	$ 28,600,000		$ 28,600,000

Debt - Summary of Long-Term Deb

Debt - Summary of Long-Term Debt Related to Amended and Restated Term Loan Facility (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Less: Current maturities	$ 5.7	$ 5.7
Long-term debt, net of current maturities, debt discount and deferred financing fees	507.6	510.9
Amended and Restated Term Loan Facility [Member]
Debt Instrument [Line Items]
Amended and Restated Term Loan Facility, with interest at LIBOR plus 2.50 as of September 30, 2022, and December 31, 2021 (equal to 5.27% and 2.59% at September 30, 2022 and December 31, 2021, respectively) due 2024, net	$ 513.3	$ 516.6

Debt - Summary of Long-Term D_2

Debt - Summary of Long-Term Debt Related to Amended and Restated Term Loan Facility (Parenthetical) (Detail) - Amended and Restated Term Loan Facility [Member] - USD ($) $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Interest rate	5.27%	2.59%
Maturity year	2024	2024
Term Loan Facility	$ 513.3	$ 516.6
Unamortized discount	1	1.4
Unamortized deferred financing fees	1.3	$ 1.7
Fair market value	$ 496.7
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Secured debt maturity period	7 years
Term Loan Facility	$ 565
Security debt maturity date	May 22, 2024
LIBOR [Member]
Debt Instrument [Line Items]
Basis spread	2.50%	2.50%

Debt - Revolving Credit Facilit

Debt - Revolving Credit Facility - Additional Information (Detail) - USD ($)	20 Months Ended
	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021	Aug. 06, 2020
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Borrowings outstanding		$ 0	$ 0
Stand-by letters of credit		$ 1,000,000	$ 1,000,000
Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin				2.75%
Revolving Credit Facility [Member] | ABR [Member]
Debt Instrument [Line Items]
Applicable margin				1.75%
Amended and Restated Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Net leverage ratio	2.50%
Amended and Restated Revolving Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Applicable margin	2.25%
Amended and Restated Revolving Credit Facility [Member] | ABR [Member]
Debt Instrument [Line Items]
Applicable margin	1.25%

Debt - Summary of Interest Expe

Debt - Summary of Interest Expense (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Debt Instrument [Line Items]
Non-cash interest for amortization of debt discount and debt issuance costs	$ 0.3	$ 0.3	$ 1	$ 1.1
Total interest expense	6.8	3.9	15.5	12
Senior Secured Term Loan [Member]
Debt Instrument [Line Items]
Interest expense on senior secured term loan	6.4	3.4	14.1	10.4
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility interest and commitment fees	$ 0.1	$ 0.2	$ 0.4	$ 0.5

Debt - Covenants - Additional I

Debt - Covenants - Additional Information (Detail) - Revolving Credit Facility [Member] $ in Millions	9 Months Ended
	Sep. 30, 2022 USD ($)
Debt Instrument [Line Items]
Percentage of amount outstanding exceeds total commitment for testing of financial covenant	35%
Maximum [Member]
Debt Instrument [Line Items]
Letters of credit outstanding amount	$ 10
First Lien [Member]
Debt Instrument [Line Items]
Leverage ratio	550%

Fair Value Measurements and F_3

Fair Value Measurements and Financial Risk - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Assets
Total assets at fair value	$ 366.1	$ 231.2
Liabilities
Market-based share awards liability	0.4	0.4
Contingent consideration	36.3	36.2
Total liabilities at fair value	36.7	36.6
Cash and Cash Equivalents [Member]
Assets
Cash and cash equivalents	175.3	21.5
Certificates of Deposits [Member]
Assets
Cash and cash equivalents	99.9
Money Market Mutual Funds [Member]
Assets
Cash and cash equivalents	90.9	209.7
Fair Value Measurements Recurring [Member] | Level 1 [Member]
Assets
Total assets at fair value	266.2	231.2
Fair Value Measurements Recurring [Member] | Level 2 [Member]
Assets
Total assets at fair value	99.9
Fair Value Measurements Recurring [Member] | Level 3 [Member]
Liabilities
Market-based share awards liability	0.4	0.4
Contingent consideration	36.3	36.2
Total liabilities at fair value	36.7	36.6
Fair Value Measurements Recurring [Member] | Cash and Cash Equivalents [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	175.3	21.5
Fair Value Measurements Recurring [Member] | Certificates of Deposits [Member] | Level 2 [Member]
Assets
Cash and cash equivalents	99.9
Fair Value Measurements Recurring [Member] | Money Market Mutual Funds [Member] | Level 1 [Member]
Assets
Cash and cash equivalents	$ 90.9	$ 209.7

Fair Value Measurements and F_4

Fair Value Measurements and Financial Risk - Financial Assets and Liabilities Measured at Fair Value on Recurring Basis (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Certificates of deposit	$ 99.9
Money market mutual funds	90.9
Market-based share awards liability	0.4	$ 0.4
Contingent consideration	28.5
Other Noncurrent Liabilities [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Market-based share awards liability	0.4
Contingent consideration	$ 7.8

Fair Value Measurements and F_5

Fair Value Measurements and Financial Risk - Additional Information (Detail) - USD ($)	3 Months Ended			9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2022	Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Market-based share awards liability	$ 400,000			$ 400,000	$ 400,000
Contingent consideration on purchase price	36,300,000			36,300,000	36,200,000
Selling, General and Administrative Expenses [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Remeasurement adjustments	(9,600,000)	$ (9,600,000)	$ (9,600,000)
G3 Communications, EDspaces, PlumRiver, Sue Bryce Education, MJBiz, Advertising Week and Bulletin [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration on purchase price	36,300,000			36,300,000	36,200,000
G3 Communications [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Remeasurement adjustments			$ 6,500,000
Expected to be Settled in 2023 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration on purchase price	28,500,000			28,500,000
Expected to be Settled in 2024 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration on purchase price	1,900,000			1,900,000
Expected to be Settled in 2025 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration on purchase price	300,000			300,000
Expected to be Settled in 2027 [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Contingent consideration on purchase price	5,700,000			5,700,000
Market-based Share Awards [Member]
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]
Market-based share awards liability	$ 400,000			400,000	$ 400,000
Employee right to receive restricted stock equal to maximum cash price				$ 9,800,000

Redeemable Convertible Prefer_2

Redeemable Convertible Preferred Stock and Stockholders' Deficit - Additional Information (Detail) - USD ($)					1 Months Ended	3 Months Ended						9 Months Ended
	Aug. 13, 2020	Jul. 24, 2020	Jun. 29, 2020	Jun. 10, 2020	Oct. 31, 2020	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Oct. 31, 2022
Temporary Equity And Shareholders Equity [Line Items]
Dividends paid or declared						$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Repurchase of common stock						5,800,000			5,600,000			$ 10,100,000	$ 10,700,000
October 2020 Share Repurchase Program [Member]
Temporary Equity And Shareholders Equity [Line Items]
Stock repurchase program, authorized amount					$ 20,000,000
Repurchase of common stock						$ 5,900,000			$ 5,500,000			$ 10,200,000	$ 10,700,000
Repurchase of common stock, shares						1,590,030			1,193,861			2,828,236	2,122,964
Stock repurchase program, remaining authorized repurchase amount						$ 9,200,000						$ 9,200,000
October 2020 Share Repurchase Program [Member] | Subsequent Event [Member]
Temporary Equity And Shareholders Equity [Line Items]
Stock repurchase program, authorized amount														$ 20,000,000
Maximum [Member] | October 2020 Share Repurchase Program [Member]
Temporary Equity And Shareholders Equity [Line Items]
Repurchase of common stock					$ 20,000,000
Redeemable Convertible Preferred Stock [Member]
Temporary Equity And Shareholders Equity [Line Items]
Dividends payable to common stock						$ 0	$ 0	$ 0	$ 0	$ 0	$ 0	$ 0
Consecutive trading days												20 days
Right to redeem preferred stock threshold period												6 years
Preferred stock as percentage on outstanding common stock on an as-converted basis												30%
Redeemable Convertible Preferred Stock [Member] | After Six-Year Anniversary Thereof [Member]
Temporary Equity And Shareholders Equity [Line Items]
Percentage of accreted liquidation preference												105%
Redeemable Convertible Preferred Stock [Member] | After Seven-Year Anniversary Thereof [Member]
Temporary Equity And Shareholders Equity [Line Items]
Percentage of accreted liquidation preference												103%
Redeemable Convertible Preferred Stock [Member] | Minimum [Member]
Temporary Equity And Shareholders Equity [Line Items]
Percentage of trading price per share of common stock after third anniversary						175%						175%
Threshold purchase price for acquisition or disposition of assets												$ 100,000,000
Initial Private Placement [Member] | Onex Partners V LP [Member] | Redeemable Convertible Preferred Stock [Member]
Temporary Equity And Shareholders Equity [Line Items]
Shares issued				47,058,332
Aggregate purchase price per share				$ 5.60
Proceeds from issuance of preferred stock			$ 252,000,000
Fees and estimated expenses			11,600,000
Proceeds from stock issuance used to repay debt			$ 50,000,000
Preferred stock accretion rate per annum												7%
Preferred stock, accretion						$ 8,000,000						$ 23,600,000
Aggregate liquidation preference						$ 467,700,000						$ 467,700,000
Preferred stock initial liquidation preference						$ 5.60						$ 5.60
Number of shares issued upon conversion of preferred stock												1.59
Initial conversion price per share												$ 3.52
Preferred stock, accretion of deemed dividend						$ 9,900,000			$ 9,000,000			$ 28,700,000	$ 26,300,000
Rights Offering [Member] | Onex Partners V LP [Member] | Redeemable Convertible Preferred Stock [Member]
Temporary Equity And Shareholders Equity [Line Items]
Shares issued	22,660,587	1,727,427
Proceeds from issuance of preferred stock	$ 121,300,000	$ 9,700,000
Fees and estimated expenses	$ 5,600,000

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail)		1 Months Ended		3 Months Ended			9 Months Ended
	Jan. 31, 2019 USD ($) Hours shares	Jan. 31, 2020 USD ($)	Jun. 30, 2019 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Mar. 31, 2019 USD ($)	Sep. 30, 2022 USD ($) $ / shares shares	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)	Mar. 31, 2020 USD ($)
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Deferred tax benefit for stock-based compensation				$ 300,000	$ 500,000		$ 1,100,000	$ 1,700,000
Market-based share awards liability				400,000			400,000		$ 400,000
Stock Options [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				900,000	1,600,000		3,100,000	4,900,000
Unrecognized stock-based compensation expense				8,500,000			$ 8,500,000
Unrecognized stock-based compensation expense weighted average period of recognition							2 years 8 months 19 days
Restricted Stock Units ("RSUs") [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				500,000	900,000		$ 1,900,000	3,300,000
Unrecognized stock-based compensation expense				2,500,000			$ 2,500,000
Unrecognized stock-based compensation expense weighted average period of recognition							2 years
Estimated shares of common stock granted | shares							126,000
Weighted-average grant date fair value | $ / shares							$ 3.58
Market-based Share Awards [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock-based compensation expense				$ 100,000	$ 0		$ 0	$ 0
Employee right to receive restricted stock equal to maximum price		$ 4,900,000	$ 4,900,000
Estimated weighted average conversion threshold | $ / shares				$ 21.08			$ 21.08
Estimated shares of common stock issue upon conversion | shares				78,041			78,041
Estimated shares of common stock granted | shares							78,041
Weighted-average grant date fair value | $ / shares							$ 24.77
Market-based share awards liability				$ 400,000			$ 400,000		$ 400,000
Fair value at grant date						$ 800,000
Fair value of awards										$ 1,100,000
2019 Employee Stock Purchase Plan [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Percentage of discount received	10
Common stock, reserved for issuance | shares	500,000
2019 Employee Stock Purchase Plan [Member] | Minimum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of hours per week worked by employees for eligible | Hours	20
Number of months of service to be completed for eligible	6 months
2019 Employee Stock Purchase Plan [Member] | Maximum [Member]
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Amount of compensation	$ 150,000

Stock-Based Compensation - Sche

Stock-Based Compensation - Schedule of Stock Option Activity (Detail) - $ / shares shares in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Number of Options Outstanding, Beginning Balance	14,403
Number of Options, Granted	575
Number of Options, Forfeited	(523)
Number of Options Outstanding, Ending Balance	14,455	14,403
Number of Options, Exercisable	4,845
Weighted-Average Exercise Price per Option Outstanding, Beginning Balance	$ 8.10
Weighted-Average Exercise Price per Option, Granted	5.66
Weighted-Average Exercise Price per Option, Forfeited	10.18
Weighted-Average Exercise Price per Option Outstanding, Ending Balance	7.93	$ 8.10
Weighted-Average Exercise Price per Option, Exercisable	$ 10.97
Weighted-Average Remaining Contractual Term, Outstanding Balance	7 years 6 months	8 years 1 month 6 days
Weighted-Average Remaining Contractual Term, Exercisable	5 years 9 months 18 days

Stock-Based Compensation - Sc_2

Stock-Based Compensation - Schedule of Restricted Stock Units Activity (Detail) - Restricted Stock Units ("RSUs") [Member] shares in Thousands	9 Months Ended
	Sep. 30, 2022 $ / shares shares
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Number of RSUs Unvested, Beginning Balance | shares	1,358
Number of RSUs, Granted | shares	126
Number of RSUs, Forfeited | shares	(47)
Number of RSUs, Vested | shares	(504)
Number of RSUs Unvested, Ending Balance | shares	933
Weighted Average Grant Date Fair Value per Share Unvested, Beginning Balance | $ / shares	$ 8.13
Weighted Average Grant Date Fair Value per Share, Granted | $ / shares	3.58
Weighted Average Grant Date Fair Value per Share, Forfeited | $ / shares	10.72
Weighted Average Grant Date Fair Value per Share, Vested | $ / shares	8.73
Weighted Average Grant Date Fair Value per Share Unvested, Ending Balance | $ / shares	$ 7.05

Stock-Based Compensation - Sc_3

Stock-Based Compensation - Schedule of Assumptions Used in Determining Fair Value Performance-based Market Condition Share Awards Outstanding (Detail) - Market-based Share Awards [Member]	9 Months Ended
	Sep. 30, 2022
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Expected volatility	57.50%
Dividend yield	0%
Risk-free interest rate	3.97%
Weighted-average expected term (in years)	4 years 6 months

Earnings Per Share - Additional

Earnings Per Share - Additional Information (Detail) - 7% Series A Convertible Participating Preferred Stock [Member]	9 Months Ended
	Sep. 30, 2022 shares
Earnings Per Share [Line Items]
Preferred stock, shares outstanding	71,416,907
Convertible preferred stock, converted to common stock	132,868,526
Convertible preferred stock, percentage	7%

Earnings Per Share - Computatio

Earnings Per Share - Computation of Basic and Diluted Earnings Per Common Share (Detail) - USD ($) $ / shares in Units, shares in Thousands, $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Earnings Per Share [Line Items]
Net income (loss) and comprehensive income (loss)	$ 93	$ (9)	$ 108.4	$ (70.8)	$ (79.7)
Accretion to redemption value of redeemable convertible preferred stock	(9.9)	(9)	(28.7)	(26.3)
Participation rights on if-converted basis	(54.7)		(51.9)
Net income (loss) and comprehensive income (loss) attributable to Emerald Holding, Inc. common stockholders	$ 28.4	$ (18)	$ 27.8	$ (97.1)	$ (115.3)
Weighted average common shares outstanding	68,433	71,033	69,479	71,719	71,309
Basic income (loss) per share	$ 0.42	$ (0.25)	$ 0.40	$ (1.35)	$ (1.62)
Diluted weighted average common shares outstanding	68,643	71,033	69,588	71,719	71,309
Diluted income (loss) per share	$ 0.41	$ (0.25)	$ 0.40	$ (1.35)	$ (1.62)
Anti-dilutive employee share awards excluded from diluted earnings per share calculation	14,455	1,259	14,814	14,911
Redeemable Convertible Preferred Stock [Member]
Earnings Per Share [Line Items]
Accretion to redemption value of redeemable convertible preferred stock	$ (9.9)	$ (9)	$ (28.7)	$ (26.3)

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Income Tax Disclosure [Abstract]
U.S. Corporate federal income tax rate			21%
(Benefit from) provision for income taxes	$ 28.2	$ (2)	$ 30.3	$ 0.6
Effective income tax rates	23.30%	17.50%	21.80%	(0.90%)
Liabilities for unrecognized tax benefits and associated interest and penalties	$ 0		$ 0		$ 0

Accounts Payable and Other Cu_3

Accounts Payable and Other Current Liabilities - Schedule of Accounts Payable and Other Current Liabilities (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Payables And Accruals [Abstract]
Accrued event costs	$ 11.5	$ 9.5
Accrued personnel costs	19.6	16
Trade payables	16.8	12
Other current liabilities	17.1	10.8
Total accounts payable and other current liabilities	$ 65	$ 48.3

Segment Information - Additiona

Segment Information - Additional Information (Detail)	9 Months Ended
	Sep. 30, 2022 Segment BrandPortfolio
Segment Reporting Information [Line Items]
Number of operating segments, aggregated into reportable segments	5
Number of reportable segments	2
Number of additional operating segments that do not meet quantitative thresholds for reporting segment	2
New Chief Operating Decision Maker [Member]
Segment Reporting Information [Line Items]
Number of operating segment	7
Number of executive brand portfolios | BrandPortfolio	7

Segment Information - Reconcili

Segment Information - Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net Income (Loss) (Detail) - USD ($)	3 Months Ended			9 Months Ended		12 Months Ended
	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Revenues
Revenues	$ 62,400,000		$ 76,500,000	$ 232,300,000	$ 104,400,000
Other Income, net
Other income, net	2,400,000		1,100,000	34,200,000	17,500,000
Adjusted EBITDA
Subtotal Adjusted EBITDA	15,400,000		20,900,000	106,500,000	27,100,000
General corporate and other expenses	(14,300,000)		(11,500,000)	(40,600,000)	(34,000,000)
Other Income, net	148,600,000			148,600,000
Interest expense, net	(6,000,000)		(3,900,000)	(14,400,000)	(12,000,000)
Goodwill impairment charge	0	$ (6,300,000)		(6,300,000)
Intangible asset impairment charge		$ (1,600,000)		(1,600,000)
Depreciation and amortization expense	(14,700,000)		(12,200,000)	(43,000,000)	(36,100,000)
Stock-based compensation expense	(1,300,000)		(2,400,000)	(5,000,000)	(8,200,000)
Deferred revenue adjustment	(200,000)		(300,000)	(600,000)	(1,400,000)
Other items	(6,300,000)		(1,600,000)	(4,900,000)	(5,600,000)
Income (loss) before income taxes	121,200,000		(11,000,000)	138,700,000	(70,200,000)	$ (81,000,000)
Commerce [Member]
Revenues
Revenues	33,900,000		38,800,000	110,300,000	48,300,000
Other Income, net
Other income, net	2,400,000		1,100,000	8,000,000	7,800,000
Adjusted EBITDA
Subtotal Adjusted EBITDA	16,000,000		17,200,000	57,600,000	19,900,000
Design, Creative and Technology [Member]
Revenues
Revenues	23,000,000		34,800,000	108,100,000	48,000,000
Other Income, net
Other income, net				25,300,000	9,200,000
Adjusted EBITDA
Subtotal Adjusted EBITDA	2,500,000		4,200,000	57,000,000	7,300,000
Goodwill impairment charge				(5,800,000)
Intangible asset impairment charge				(1,600,000)
All Other [Member]
Revenues
Revenues	5,500,000		2,900,000	13,900,000	8,100,000
Other Income, net
Other income, net				900,000	500,000
Adjusted EBITDA
Subtotal Adjusted EBITDA	$ (3,100,000)		$ (500,000)	(8,100,000)	$ 100,000
Goodwill impairment charge				$ (500,000)

Segment Information - Reconci_2

Segment Information - Reconciliation of Reportable Segment Revenues, Other Income and Adjusted EBITDA to Net Income (Loss) (Parenthetical) (Detail) $ in Millions	Aug. 03, 2022 USD ($)
COVID-19 [Member]
Segment Reporting Information [Line Items]
Insurance litigation settlement proceeds relating to event cancellation	$ 148.6

Related Party Transactions - Ad

Related Party Transactions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Onex Corporation [Member]
Related Party Transaction [Line Items]
Related parties, ownership percentage	88.10%		88.10%
ASM Global [Member]
Related Party Transaction [Line Items]
Due to related parties	$ 0		$ 0		$ 100,000
ASM Global [Member] | Onex Corporation [Member]
Related Party Transaction [Line Items]
Related parties, ownership percentage	48%		48%
ASM Global [Member] | Cost Of Revenues [Member]
Related Party Transaction [Line Items]
Cost of services facilities and catering	$ 400,000	$ 300,000	$ 1,200,000	$ 400,000
Convex Group Ltd [Member]
Related Party Transaction [Line Items]
Due to related parties	$ 0		$ 0		$ 0
Convex Group Ltd [Member] | Onex Corporation [Member]
Related Party Transaction [Line Items]
Related parties, ownership percentage	97%		97%
Convex Group Ltd [Member] | Cost Of Revenues [Member]
Related Party Transaction [Line Items]
Selling, general and administrative expense insurance	$ 0	$ 0	$ 500,000	$ 0

Subsequent Event - Additional I

Subsequent Event - Additional Information (Detail)	Oct. 26, 2022 USD ($)
October 2022 Share Repurchase Program [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Stock repurchase program, authorized amount	$ 20,000,000