Compass (COMP) 10-Q 14 Nov 22 2022 Q3 Quarterly report Financial data

Cover Page

Cover Page - shares	9 Months Ended
	Sep. 30, 2022	Nov. 02, 2022
Cover [Abstract]
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Sep. 30, 2022
Document Transition Report	false
Entity File Number	001-40291
Entity Registrant Name	COMPASS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	30-0751604
Entity Address, Address Line One	90 Fifth Avenue, 3rd Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10011
City Area Code	212
Local Phone Number	913-9058
Title of 12(g) Security	Class A Common Stock, $0.00001 par value per share
Trading Symbol	COMP
Security Exchange Name	NYSE
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
Entity Shell Company	false
Entity Common Stock, Shares Outstanding		435,473,094
Amendment Flag	false
Document Fiscal Year Focus	2022
Document Fiscal Period Focus	Q3
Entity Central Index Key	0001563190
Current Fiscal Year End Date	--12-31

Condensed Consolidated Balance

Condensed Consolidated Balance Sheets - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Current Assets
Cash and cash equivalents	$ 354.9	$ 618.3
Accounts receivable, net of allowance of $8.0 and $7.1, respectively	34.2	48.5
Compass Concierge receivables, net of allowance of $15.6 and $17.3, respectively	60.2	32.9
Other current assets	92.5	94.9
Total current assets	541.8	794.6
Property and equipment, net	196.7	157.4
Operating lease right-of-use assets	490.1	484.7
Intangible assets, net	107.7	127.2
Goodwill	198.5	188.3
Other non-current assets	54.3	48.4
Total assets	1,589.1	1,800.6
Current liabilities
Accounts payable	44.7	34.6
Commissions payable	66.1	63.9
Accrued expenses and other current liabilities	204.9	240.9
Current lease liabilities	91.7	81.5
Concierge credit facility	36.5	16.2
Total current liabilities	443.9	437.1
Non-current lease liabilities	494.3	483
Other non-current liabilities	9.3	32.9
Total liabilities	947.5	953
Commitments and contingencies (Note 6)
Stockholders’ equity
Common stock, $0.00001 par value, 13,850,000,000 shares authorized at September 30, 2022 and December 31, 2021; 434,068,619 shares issued and outstanding at September 30, 2022; 409,267,751 shares issued and outstanding at December 31, 2021	0	0
Additional paid-in capital	2,676.3	2,438.8
Accumulated deficit	(2,038.4)	(1,595)
Total Compass, Inc. stockholders’ equity	637.9	843.8
Non-controlling interest	3.7	3.8
Total stockholders' equity	641.6	847.6
Total liabilities and stockholders’ equity	$ 1,589.1	$ 1,800.6

Condensed Consolidated Balanc_2

Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Statement of Financial Position [Abstract]
Allowance for credit loss on accounts receivable current	$ 8	$ 7.1
Allowance for credit loss on financing receivable current	$ 15.6	$ 17.3
Common stock par or stated value per share (in dollars per share)	$ 0.00001	$ 0.00001
Common stock shares authorized (in shares)	13,850,000,000	13,850,000,000
Common stock shares issued (in shares)	434,068,619	409,267,751
Common stock shares outstanding (in shares)	434,068,619	409,267,751

Condensed Consolidated Statemen

Condensed Consolidated Statements of Operations - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Statement [Abstract]
Revenue	$ 1,493,700,000	$ 1,743,600,000	$ 4,910,800,000	$ 4,808,900,000
Operating expenses:
Commissions and other related expense	1,218,000,000	1,430,600,000	4,017,300,000	3,963,200,000
Sales and marketing	144,400,000	130,600,000	444,300,000	366,200,000
Operations and support	95,100,000	97,000,000	308,900,000	263,700,000
Research and development	81,500,000	89,700,000	296,900,000	259,800,000
General and administrative	56,500,000	79,500,000	167,000,000	231,800,000
Restructuring costs	29,000,000	0	47,900,000	0
Depreciation and amortization	21,000,000	16,700,000	65,100,000	45,100,000
Total operating expenses	1,645,500,000	1,844,100,000	5,347,400,000	5,129,800,000
Loss from operations	(151,800,000)	(100,500,000)	(436,600,000)	(320,900,000)
Investment income, net	1,100,000	100,000	1,500,000	100,000
Interest expense	(900,000)	(700,000)	(2,300,000)	(1,800,000)
Loss before income taxes and equity in loss of unconsolidated entity	(151,600,000)	(101,100,000)	(437,400,000)	(322,600,000)
Benefit from income taxes	0	1,300,000	1,400,000	3,300,000
Equity in loss of unconsolidated entity	(2,500,000)	0	(7,500,000)	0
Net loss	(154,100,000)	(99,800,000)	(443,500,000)	(319,300,000)
Net (income) loss attributable to non-controlling interests	(100,000)	0	100,000	0
Net loss attributable to Compass, Inc.	$ (154,200,000)	$ (99,800,000)	$ (443,400,000)	$ (319,300,000)
Net loss per share attributable to Compass, Inc., basic (in dollars per share)	$ (0.36)	$ (0.25)	$ (1.04)	$ (1.06)
Net loss per share attributable to Compass, Inc., diluted (in dollars per share)	$ (0.36)	$ (0.25)	$ (1.04)	$ (1.06)
Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., basic (in shares)	432,459,739	392,979,596	425,338,530	300,303,624
Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., diluted (in shares)	432,459,739	392,979,596	425,338,530	300,303,624

Condensed Consolidated Statem_2

Condensed Consolidated Statements of Convertible Preferred Stock and Stockholders' Equity - USD ($)	Total	2021 Agent Equity Program	Common Stock	Common Stock 2021 Agent Equity Program	Additional Paid-in Capital	Additional Paid-in Capital 2021 Agent Equity Program	Accumulated Deficit	Total Compass, Inc. Stockholders’ Equity	Total Compass, Inc. Stockholders’ Equity 2021 Agent Equity Program	Non-controlling Interest	Preferred Stock Convertible preferred stock
Beginning balance (in shares) at Dec. 31, 2020											237,047,550
Beginning balance (in shares) at Dec. 31, 2020			122,971,900
Beginning balance at Dec. 31, 2020	$ (862,900,000)				$ 238,000,000		$ (1,100,900,000)	$ (862,900,000)		$ 0	$ 1,486,700,000
Net loss	(319,600,000)						(319,300,000)	(319,300,000)		(300,000)
Capital contribution from non-controlling interest	5,000,000									5,000,000
Issuance of common stock in connection with acquisitions (in shares)			855,740
Issuance of common stock in connection with acquisitions	10,100,000				10,100,000			10,100,000
Issuance of common stock upon exercise of stock options (in shares)			10,004,310
Issuance of common stock upon exercise of stock options	14,100,000				14,100,000			14,100,000
Vesting of early exercised stock options	3,800,000				3,800,000			3,800,000
Stock-based compensation	254,000,000				254,000,000			254,000,000
Conversion of Series D convertible preferred stock (in shares)			15,920,450								(15,920,450)
Conversion of Series D convertible preferred stock	67,600,000				67,600,000			67,600,000			$ (67,600,000)
Conversion of convertible preferred stock in connection with the initial public offering (in shares)			223,033,725								(221,127,100)
Conversion of convertible preferred stock in connection with the initial public offering	1,419,100,000				1,419,100,000			1,419,100,000			$ (1,419,100,000)
Issuance of common stock in connection with the initial public offering, net of offering costs (in shares)			26,296,438
Issuance of common stock in connection with the initial public offering, offering cost	438,700,000				438,700,000			438,700,000
Ending balance (in shares) at Sep. 30, 2021											0
Ending balance (in shares) at Sep. 30, 2021			399,082,563
Ending balance at Sep. 30, 2021	1,029,900,000				2,445,400,000		(1,420,200,000)	1,025,200,000		4,700,000	$ 0
Beginning balance (in shares) at Jun. 30, 2021			394,419,967
Beginning balance at Jun. 30, 2021	1,075,500,000				2,395,900,000		(1,320,400,000)	1,075,500,000		0
Net loss	(100,100,000)						(99,800,000)	(99,800,000)		(300,000)
Capital contribution from non-controlling interest	5,000,000									5,000,000
Issuance of common stock upon exercise of stock options (in shares)			4,662,596
Issuance of common stock upon exercise of stock options	2,900,000				2,900,000			2,900,000
Vesting of early exercised stock options	1,300,000				1,300,000			1,300,000
Stock-based compensation	45,300,000				45,300,000			45,300,000
Ending balance (in shares) at Sep. 30, 2021											0
Ending balance (in shares) at Sep. 30, 2021			399,082,563
Ending balance at Sep. 30, 2021	$ 1,029,900,000				2,445,400,000		(1,420,200,000)	1,025,200,000		4,700,000	$ 0
Beginning balance (in shares) at Dec. 31, 2021	409,267,751		409,267,751
Beginning balance at Dec. 31, 2021	$ 847,600,000				2,438,800,000		(1,595,000,000)	843,800,000		3,800,000
Net loss	(443,500,000)						(443,400,000)	(443,400,000)		(100,000)
Issuance of common stock in connection with acquisitions (in shares)			335,252
Issuance of common stock in connection with acquisitions	$ 2,000,000				2,000,000			2,000,000
Issuance of common stock upon exercise of stock options (in shares)	3,949,244		3,949,244
Issuance of common stock upon exercise of stock options	$ 8,600,000				8,600,000			8,600,000
Issuance of common stock upon settlement of RSUs, net of taxes withheld (in shares)			6,328,555
Issuance of common stock upon settlement of RSUs, net of taxes withheld	(19,500,000)				(19,500,000)			(19,500,000)
Vesting of early exercised stock options	5,300,000				5,300,000			5,300,000
Issuance of common stock in connection with the 2021 Agent Equity Program (in shares)				13,608,896
Issuance of common stock in connection with the 2021 Agent Equity Program		$ 100,000,000				$ 100,000,000			$ 100,000,000
Issuance of common stock under the Employee Stock Purchase Plan (in shares)			578,921
Issuance of common stock under the Employee Stock Purchase Plan	2,300,000				2,300,000			2,300,000
Stock-based compensation	$ 138,800,000				138,800,000			138,800,000
Ending balance (in shares) at Sep. 30, 2022	434,068,619		434,068,619
Ending balance at Sep. 30, 2022	$ 641,600,000				2,676,300,000		(2,038,400,000)	637,900,000		3,700,000
Beginning balance (in shares) at Jun. 30, 2022			429,957,017
Beginning balance at Jun. 30, 2022	755,800,000				2,636,400,000		(1,884,200,000)	752,200,000		3,600,000
Net loss	(154,100,000)						(154,200,000)	(154,200,000)		100,000
Issuance of common stock in connection with acquisitions (in shares)			211,400
Issuance of common stock in connection with acquisitions	1,200,000				1,200,000			1,200,000
Issuance of common stock upon exercise of stock options (in shares)			417,056
Issuance of common stock upon exercise of stock options	900,000				900,000			900,000
Issuance of common stock upon settlement of RSUs, net of taxes withheld (in shares)			2,904,225
Issuance of common stock upon settlement of RSUs, net of taxes withheld	(5,700,000)				(5,700,000)			(5,700,000)
Vesting of early exercised stock options	3,100,000				3,100,000			3,100,000
Issuance of common stock under the Employee Stock Purchase Plan (in shares)			578,921
Issuance of common stock under the Employee Stock Purchase Plan	2,300,000				2,300,000			2,300,000
Stock-based compensation	$ 38,100,000				38,100,000			38,100,000
Ending balance (in shares) at Sep. 30, 2022	434,068,619		434,068,619
Ending balance at Sep. 30, 2022	$ 641,600,000				$ 2,676,300,000		$ (2,038,400,000)	$ 637,900,000		$ 3,700,000

Condensed Consolidated Statem_3

Condensed Consolidated Statements of Cash Flows - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021
Operating Activities
Net loss	$ (443.5)	$ (319.3)
Adjustments to reconcile net loss to net cash (used in) provided by operating activities:
Depreciation and amortization	65.1	45.1
Stock-based compensation	173.1	292.9
Equity in loss of unconsolidated entity	7.5	0
Change in acquisition related contingent consideration	(1.9)	(4.4)
Bad debt expense	5.2	8.9
Amortization of debt issuance costs	0.7	0.9
Changes in operating assets and liabilities:
Accounts receivable	11.1	1.6
Compass Concierge receivables	(29.1)	(7.1)
Other current assets	1.8	(29.6)
Other non-current assets	1.9	(13.4)
Operating lease right-of-use assets and operating lease liabilities	5.8	1.6
Accounts payable	5.9	(2.4)
Commissions payable	2.2	8.8
Accrued expenses and other liabilities	20.3	64.7
Net cash (used in) provided by operating activities	(173.9)	48.3
Investing Activities
Investment in unconsolidated entity	(15)	0
Capital expenditures	(56.9)	(33.6)
Payments for acquisitions, net of cash acquired	(15)	(127.3)
Net cash used in investing activities	(86.9)	(160.9)
Financing Activities
Proceeds from exercise and early exercise of stock options	8.6	19.1
Proceeds from issuance of common stock under Employee Stock Purchase Plan	2.3	0
Taxes paid related to net share settlement of equity awards	(19.5)	0
Proceeds from drawdowns on Concierge credit facility	47	29.6
Repayments of drawdowns on Concierge credit facility	(26.7)	(19.3)
Payments related to acquisitions, including contingent consideration	(13.9)	(8.2)
Payments of debt issuance costs for credit facilities	(0.4)	(1.9)
Proceeds from capital contribution of non-controlling interest	0	5
Proceeds from issuance of common stock upon initial public offering, net of offering costs	0	439.6
Net cash (used in) provided by financing activities	(2.6)	463.9
Net (decrease) increase in cash and cash equivalents	(263.4)	351.3
Cash and cash equivalents at beginning of period	618.3	440.1
Cash and cash equivalents at end of period	354.9	791.4
Supplemental disclosures of cash flow information:
Cash paid for interest	1.5	0.7
Supplemental non-cash information:
Issuance of common stock for acquisitions	2	10.1
Conversion of convertible preferred stock in connection with initial public offering	0	1,419.1
Conversion of Series D convertible preferred stock	$ 0	$ 67.6

Business and Basis of Presentat

Business and Basis of Presentation	9 Months Ended
	Sep. 30, 2022
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Business and Basis of Presentation	Business and Basis of Presentation Description of the Business Compass, Inc. (the “Company”) was incorporated in Delaware on October 4, 2012 under the name Urban Compass, Inc. On January 8, 2021, the board of directors approved a change to the Company’s name from Urban Compass, Inc. to Compass, Inc. The Company provides an end-to-end platform that empowers its residential real estate agents to deliver exceptional service to seller and buyer clients. The Company’s platform includes an integrated suite of cloud-based software for customer relationship management, marketing, client service and other critical functionality, all custom-built for the real estate industry, which enables the Company’s core brokerage services. The platform also uses proprietary data, analytics, artificial intelligence, and machine learning to deliver high value recommendations and outcomes for Compass agents and their clients. The Company’s agents are independent contractors who affiliate their real estate licenses with the Company, operating their businesses on the Company’s platform and under the Compass brand. The Company generates revenue from clients through its agents by assisting home sellers and buyers in listing, marketing, selling and finding homes as well as through the provision of services adjacent to the transaction, like title and escrow services, which comprise a smaller portion of the Company’s revenue to date. The Company currently generates substantially all of its revenue from commissions paid by clients at the time that a home is transacted. Initial Public Offering On April 6, 2021, the Company completed its initial public offering (“IPO”) and the Company’s Class A common stock began trading on the New York Stock Exchange on April 1, 2021 under the symbol “COMP”. In connection with the IPO, the Company issued and sold 26.3 million shares of its common stock at a public offering price of $18.00 per share. The Company received aggregate proceeds of $438.7 million from the IPO, net of the underwriting discount and offering costs of approximately $11.0 million (of which $0.9 million were paid in 2020). Offering costs, including the legal, accounting, printing and other IPO-related costs have been recorded in Additional paid-in capital against the proceeds from the offering. During April 2021, also in connection with the IPO, all series of the Company’s convertible preferred stock then outstanding were converted into 223.0 million shares of common stock and the Company reclassified $1.4 billion of Convertible preferred stock to Additional paid-in-capital. On March 31, 2021, in connection with the effectiveness of the Company’s IPO registration statement, the Company recognized $148.5 million in stock-based compensation expense for (i) certain RSUs that contained both service-based and liquidity event-based vesting conditions as the liquidity event-based vesting condition was satisfied upon effectiveness of the registration statement and (ii) certain stock options and RSU awards with service, performance and market-based vesting conditions that include stock price targets to be met after the listing of the Company’s stock on a public exchange. Basis of Presentation The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company’s condensed consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and include the assets, liabilities, revenues and expenses of all controlled subsidiaries. The condensed consolidated statements of operations include the results of entities acquired from the date of each respective acquisition. Interests held by third parties in consolidated subsidiaries are presented as non-controlling interests, which represents the non-controlling stockholders’ interests in the underlying net assets of the Company’s consolidated subsidiaries. For entities where the Company does not have a controlling interest (financial or operating), the investments in such entities are accounted for using the equity method. The Company applies the equity method of accounting when it has the ability to exercise significant influence over the operating and financial policies of an investee. The Company measures all other investments at fair value with changes in fair value recognized in net income or in the case that an equity investment does not have readily determinable fair values, at cost minus impairment (if any) plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. The unaudited interim condensed consolidated financial statements and related disclosures have been prepared by management on a basis consistent with the annual consolidated financial statements and, in the opinion of management, include all adjustments necessary for a fair statement of the interim periods presented. The results of the interim periods presented are not necessarily indicative of the results expected for the full year. Certain information and notes normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted under the SEC’s rules and regulations. Accordingly, the unaudited condensed consolidated financial statements and notes included herein should be read in conjunction with the Company’s audited consolidated financial statements and the related notes for the year ended December 31, 2021, included in the 2021 Form 10-K. Liquidity Since inception, the Company has primarily generated negative cash flows from operations and has primarily financed operations from net proceeds from the issuance of convertible preferred stock and common stock. In addition, a number of macroeconomic conditions, including rising inflation and rapidly rising mortgage interest rates, have contributed to a slowdown in the U.S. residential real estate market, which has had an adverse impact on the Company’s business and may continue to adversely impact the Company’s business in the future. The Company has a Revolving Credit Facility, which it can draw upon provided it maintains continued compliance with certain financial and non-financial covenants. As of September 30, 2022, the Company had $318.2 million available to be drawn under the Revolving Credit Facility and was in compliance with each of the financial and non-financial covenants. See Note 5 — "Debt" for further details. During the nine months ended September 30, 2022, the Company announced various restructuring actions to improve the alignment between the Company’s organizational structure and its long-term business strategy, drive cost efficiencies enabled by the Company’s technology and other competitive advantages and continue to drive toward profitability and positive free cash flow. The actions are expected to reduce the Company's annual cash operating expense levels to between $1.05 billion to $1.15 billion for the year ended December 31, 2023. This target expense level excludes Commission and other related expense, Depreciation and amortization and stock-based compensation expense. See Note 12 — "Restructuring Activities" for further details. As of September 30, 2022 and December 31, 2021, the Company held cash and cash equivalents of approximately $354.9 million and $618.3 million, respectively. The Company believes that it will have sufficient liquidity from cash on hand, its Revolving Credit Facility, and future operations to sustain its business operations for the next twelve months and beyond.

Summary of Significant Accounti

Summary of Significant Accounting Policies	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and reported amounts of revenue and expenses during the reporting periods covered by the condensed consolidated financial statements and accompanying notes. These judgments, estimates and assumptions are used for, but not limited to (i) valuation of the Company’s common stock and stock awards, (ii) fair value of acquired intangible assets and goodwill, (iii) fair value of contingent consideration arrangements in connection with business combinations, (iv) incremental borrowing rate used for the Company’s operating leases, (v) useful lives of long-lived assets, (vi) impairment of intangible assets and goodwill, (vii) allowance for Compass Concierge receivables and (viii) income taxes and certain deferred tax assets. The Company determines its estimates and judgments based on historical experience and on various other assumptions that it believes are reasonable under the circumstances. However, actual results could differ from these estimates and these differences may be material. Business Combinations Business combinations are accounted for under the acquisition method of accounting. This method requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over the values of these identifiable assets and liabilities is recorded as goodwill. When determining the fair value of assets acquired and liabilities assumed, management makes significant estimates and assumptions, especially with respect to intangible assets. Management’s estimates of fair value are based upon assumptions believed to be reasonable, but which are inherently uncertain and unpredictable and, as a result, actual results may differ from estimates. During the measurement period, not to exceed one year from the date of acquisition, the Company may record adjustments to the assets acquired and liabilities assumed, with a corresponding offset to goodwill if new information is obtained related to facts and circumstances that existed as of the acquisition date. After the measurement period, any subsequent adjustments are reflected in the condensed consolidated statements of operations. Acquisition costs, consisting primarily of third-party legal and consulting fees, are expensed as incurred. Stock-Based Compensation The Company issues stock-based awards to employees, affiliated agents, service providers and board members. The Company measures compensation expense for all stock-based awards based on the estimated fair value of the awards on the date of grant. Compensation expense is generally recognized on a straight-line basis over the service period based on the vesting requirements. The Company recognizes forfeitures as they occur. For stock options, the Company generally estimates the fair value using the Black-Scholes option pricing model, which requires the input of subjective assumptions, including (i) the fair value of common stock, (ii) the expected stock price volatility, (iii) the expected term of the award, (iv) the risk-free interest rate and (v) expected dividends. In addition to the issuance of RSUs to affiliated agents as compensation for the provision of services, the Company offers RSUs to agents through its Agent Equity Program. The Agent Equity Program offers affiliated agents the ability to elect to have a portion of their commissions earned during a calendar year to be paid in the form of RSUs. RSUs issued in connection with the Agent Equity Program are granted at the beginning of the year following the calendar year in which the commissions were earned and are subject to the terms and conditions of the 2012 Stock Incentive Plan and the 2021 Equity Incentive Plan, as applicable. RSUs granted prior to December 2020 generally vest based upon the satisfaction of both a service-based condition and a liquidity event-based condition. The service-based vesting condition for these awards is generally satisfied over four years, except for the RSUs granted since 2020 associated with the Agent Equity Program, which vested immediately on the date of grant. The liquidity event-based vesting condition is satisfied on the occurrence of a qualifying event, generally defined as a change in control or the effective date of the registration statement for the Company’s IPO. The fair value of these RSUs was measured based on the fair value of the Company’s common stock on the grant date and began to be recognized as expense when both the required service-based vesting condition and the liquidity event-based vesting condition had been achieved using the accelerated attribution method. The liquidity event-based vesting requirement was met on March 31, 2021, the effective date of the Company’s registration statement, see Note 1—“Business and Basis of Presentation—Initial Public Offering .” Beginning in December 2020, the Company began granting RSUs that vest upon the satisfaction of only a service-based vesting condition that generally ranges from one For RSUs to be granted in connection with the Agent Equity Program, the Company determines the value of the stock-based compensation expense at the time the underlying commission is earned and begins to recognize the associated expense on a straight-line basis over the requisite service periods beginning on the closing date of the underlying real estate commission transactions. The stock-based compensation expense is recorded as a liability and will be reclassified to Additional paid-in capital at the end of the vesting period when the underlying RSUs are granted. RSUs granted in connection with the Agent Equity Program are granted in the first quarter of the calendar year following the year in which the underlying commissions were earned. On a limited basis, the Company has issued stock options and RSUs that contain service-based, performance-based and market-based vesting conditions that include stock price targets to be met. Such awards are valued using a Monte Carlo simulation and the underlying expense will be recognized as the associated vesting conditions are met. New Accounting Pronouncements In March 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . An update was also issued expanding the scope of this guidance. The guidance provides optional expedients and exceptions for applying GAAP to contract modifications, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The guidance became effective starting March 12, 2020 and may be applied prospectively through December 31, 2022. The Company is evaluating applicable contracts and transactions to determine whether to elect the optional guidance. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers . The guidance amends ASC 805 to require acquiring entities to apply Topic 606 to recognize and measure contract assets and contract liabilities in a business combination. The amendment is effective for public companies with fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The amendment should be applied prospectively to business combinations occurring on or after the effective date. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In March 2022, the FASB issued ASU 2022-02, Financial Instruments - Credit Losses (Topic 326) - Troubled Debt Restructurings and Vintage Disclosures, which requires enhanced disclosure of certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty while eliminating certain current recognition and measurement accounting guidance. This ASU also requires the disclosure of current-period gross write-offs by year of origination for financing receivables and net investments in leases. The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The adoption of this standard is currently being evaluated and is not expected to have a material impact on the Company’s consolidated financial statements.

Acquisitions

Acquisitions	9 Months Ended
	Sep. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Acquisitions	Acquisitions During the nine months ended September 30, 2022, the Company completed the acquisition of 100% of the ownership interests in a title insurance and escrow settlement services company and acquired the assets of a small real estate brokerage. The purpose of these acquisitions was to expand the Company’s title and escrow offerings and to expand its existing brokerage business in key domestic markets. The Company has accounted for these acquisitions as business combinations. Total Consideration The total consideration for acquisitions completed during the nine months ended September 30, 2022 comprised $12.1 million of cash, net of cash acquired, $0.8 million in Class A common stock of the Company and up to $3.6 million of additional cash that may be paid contingent on certain earnings-based targets being met through 2029. Future cash payments were recorded as Accrued expenses and other current liabilities and Other non-current liabilities in the condensed consolidated balance sheets. The fair value of the assets acquired and the liabilities assumed primarily resulted in the recognition of: customer relationships of $8.1 million; trademark intangible assets of $1.1 million; $1.0 million of other current and non-current assets; and $2.5 million of current and non-current liabilities. The excess of the purchase price over the fair value of the acquired net assets was recorded as goodwill of $8.8 million. Acquired intangible assets are being amortized over their estimated useful lives of approximately 3 to 5 years. None of the goodwill recorded during the nine months ended September 30, 2022 is deductible for tax purposes. The amount of tax-deductible goodwill may increase in the future to approximately $2.6 million dependent on the payment of certain holdbacks and acquisition-related compensation arrangements. These amounts are not expected to have an impact on the income tax provision while the Company maintains a full valuation allowance on its U.S. deferred tax assets. The Company has recorded the preliminary purchase price allocation as of the acquisition dates and expects to finalize its analysis within the measurement period (up to one year from the acquisition date) of the respective transaction. Any adjustments during the measurement period would have a corresponding offset to goodwill. Upon conclusion of the measurement period or final determination of the values of assets acquired or liabilities assumed, any subsequent adjustments are recorded to the consolidated statements of operations. Pro forma revenue and earnings for 2022 acquisitions have not been presented because they are not material to the Company’s consolidated revenue and results of operations, either individually or in the aggregate. Contingent Consideration Contingent consideration represents obligations of the Company to transfer cash and common stock to the sellers of certain acquired businesses in the event that certain targets and milestones are met. Approximately $4.7 million of the obligations as of September 30, 2022 are fixed in value. As of September 30, 2022, the undiscounted maximum payment under these arrangements was $15.5 million. Changes in contingent consideration measured at fair value on a recurring basis were as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Opening balance $ 21.7 $ 33.0 $ 24.4 $ 39.8 Acquisitions — 0.7 3.6 5.4 Payments and issuances (4.6) (2.7) (10.6) (13.7) Fair value gains included in net loss (1.6) (3.9) (1.9) (4.4) Closing balance $ 15.5 $ 27.1 $ 15.5 $ 27.1 Other Acquisition Related Compensation

Fair Value of Financial Assets

Fair Value of Financial Assets and Liabilities	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Fair Value of Financial Assets and Liabilities	Fair Value of Financial Assets and Liabilities The Company’s cash and cash equivalents of $354.9 million and $618.3 million as of September 30, 2022 and December 31, 2021, respectively, are held in cash and money market funds, which are classified as Level 1 within the fair value hierarchy because they are valued using quoted prices in active markets. These are the Company’s only Level 1 financial instruments. The Company does not hold any Level 2 financial instruments. The Company’s contingent consideration liabilities of $15.5 million and $24.4 million as of September 30, 2022 and December 31, 2021, respectively, are the Company’s only Level 3 financial instruments. See Note 3 – “Acquisitions” for changes in contingent consideration for the three and nine months ended September 30, 2022 and 2021. The following table presents the balances of contingent consideration as presented in the condensed consolidated balance sheets (in millions): September 30, 2022 December 31, 2021 Accrued expenses and other current liabilities $ 9.5 $ 12.9 Other non-current liabilities 6.0 11.5 Total contingent consideration $ 15.5 $ 24.4 There were no transfers of financial instruments between Level 1, Level 2 and Level 3 during the periods presented.

Debt

Debt	9 Months Ended
	Sep. 30, 2022
Debt Disclosure [Abstract]
Debt	Debt Concierge Credit Facility In July 2020, the Company entered into a Revolving Credit and Security Agreement (the “Concierge Facility”) with Barclays Bank PLC, as administrative agent, and the several lenders party thereto. The Concierge Facility provides for a $75.0 million revolving credit facility and is solely used to finance, in part, the Company’s Compass Concierge Program. The Concierge Facility is secured primarily by the Concierge Receivables and cash of the Compass Concierge Program. On July 29, 2021, the Company amended and restated the Concierge Facility (the “A&R Concierge Facility”) to among other things, extend the revolving period to July 28, 2022, lower the interest rate to LIBOR plus a margin of 1.85%, which may be adjusted, and lower the annual commitment fee to 0.35% if the A&R Concierge Facility is utilized greater than 50% (the annual commitment fee remained the same, at 0.50%, if the Concierge Facility is utilized less than 50%). On August 5, 2022, the Company further amended and restated the Concierge Facility (the “Second A&R Concierge Facility”) to among other things extend the revolving period to August 4, 2023, replace the LIBOR benchmark with Term SOFR plus a credit adjustment spread of 0.11448% and make certain other technical adjustments. The applicable margin on the Second A&R Concierge Facility increased from 1.85% to 2.35%. The annual commitment fee as described in the preceding sentences remained the same. The interest rate on the Concierge Facility was 5.95% as of September 30, 2022. Pursuant to the Second A&R Concierge Facility, the principal amount, if any, is payable in full in February 2024, unless earlier terminated or extended. The Company has the option to repay the borrowings under the Second A&R Concierge Facility without premium or penalty prior to maturity. The Second A&R Concierge Facility contains customary affirmative covenants, such as financial statement reporting requirements, as well as covenants that restrict its ability to, among other things, incur additional indebtedness, sell certain receivables, declare dividends or make certain distributions, and undergo a merger or consolidation or certain other transactions. Additionally, in the event that the Company fails to comply with certain financial covenants that require the Company to meet certain liquidity-based measures, the commitments under the Second A&R Concierge Facility will automatically be reduced to zero and the Company will be required to repay any outstanding loans under the Second A&R Concierge Facility. As of September 30, 2022, the Company was in compliance with the covenants under the Second A&R Concierge Facility. Revolving Credit Facility In March 2021, the Company entered into a Revolving Credit and Guaranty Agreement (the “Revolving Credit Facility”) with Barclays Bank PLC, as administrative agent and as collateral agent, and certain other lenders. The Revolving Credit Facility provides for a $350.0 million revolving credit facility, subject to the terms and conditions of the Revolving Credit Facility. The Revolving Credit Facility also includes a letter of credit sublimit, which is the lesser of (i) $125.0 million and (ii) the aggregate unused amount of the revolving commitments then in effect under the Revolving Credit Facility. The Company’s obligations under the Revolving Credit Facility are guaranteed by certain of the Company’s subsidiaries and are secured by a first priority security interest in substantially all of the assets of the Company and the Company’s subsidiary guarantors. Borrowings under the Revolving Credit Facility bear interest, at the Company’s option, at either (i) a floating rate per annum equal to the base rate plus a margin of 0.50% or (ii) a floating rate per annum equal to the rate at which dollar deposits are offered in the London interbank market plus a margin of 1.50%. The base rate is equal to the highest of (a) the prime rate as quoted by The Wall Street Journal, (b) the federal funds effective rate plus 0.50%, (c) the rate at which dollar deposits are offered in the London interbank market for a one-month interest period plus 1.00% and (d) 1.00%. During an event of default under the Revolving Credit Facility, the applicable interest rates are increased by 2.0% per annum. The Company is also obligated to pay other customary fees for a credit facility of this type, including a commitment fee on a quarterly basis based on amounts committed but unused under the Revolving Credit Facility of 0.175% per annum, fees associated with letters of credit and administrative and arrangement fees. The principal amount, if any, is payable in full on March 4, 2026, unless earlier terminated or extended. The Company has the option to repay the Company’s borrowings, and to permanently reduce the loan commitments in whole or in part, under the Revolving Credit Facility without premium or penalty prior to maturity. As of September 30, 2022, there were no borrowings outstanding under the Revolving Credit Facility and outstanding letters of credit under the Revolving Credit Facility totaled approximately $31.8 million. The Revolving Credit Facility contains customary representations, warranties, financial covenants applicable to the Company and to the Company’s restricted subsidiaries, affirmative covenants, such as financial statement reporting requirements, and negative covenants which restrict their ability, among other things, to incur liens and indebtedness, make certain investments, declare dividends, dispose of, transfer or sell assets, make stock repurchases and consummate certain other matters, all subject to certain exceptions. The financial covenants require that (i) the Company maintains liquidity of at least $150.0 million as of the last day of each fiscal quarter and each date of a credit extension and (ii) the Company’s consolidated total revenue as of the last day of each fiscal quarter be equal to or greater than the specified amount corresponding to such period. The minimum required consolidated revenue threshold for the trailing four fiscal quarters is $2,418.0 million during 2022, $3,799.0 million during 2023 and $4,668.0 million thereafter. As of September 30, 2022, the Company was in compliance with the financial covenants under the Revolving Credit Facility.

Commitments and Contingencies

Commitments and Contingencies	9 Months Ended
	Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies Legal Proceedings From time to time, the Company may be involved in disputes or regulatory inquiries that arise in the ordinary course of business. When the Company determines that a loss is both probable and reasonably estimable, a liability is recorded and disclosed if the amount is material to the Company’s business, taken as a whole. When a material loss contingency is only reasonably possible, the Company does not record a liability, but instead discloses the nature and the amount of the claim and an estimate of the loss or range of loss, if such an estimate can reasonably be made. Legal costs related to the defense of loss contingencies are expensed as incurred. Claims or regulatory actions against the Company, whether meritorious or not, could have an adverse impact on the Company due to legal costs, diversion of management resources and other elements. Except as identified with respect to the matters below, the Company does not believe that the outcome of any individual existing legal or regulatory proceeding to which it is a party will have a material adverse effect on its results of operations, financial condition or overall business in each case, taken as a whole. Realogy Holdings Corp., et al v. Urban Compass, Inc. and Compass Inc. In July 2019, Realogy Holdings Corp., NRT New York LLC (“Corcoran”) and many of its related entities (collectively, “Plaintiffs”) filed a complaint against the Company in the New York Supreme Court (the "Court"). The complaint alleges various violations of New York and California state law related to claims of unfair competition and seeks unspecified damages. The Company filed a Motion to Dismiss in September 2019. In September 2019, Plaintiffs filed an amended complaint, removing one claim and adding a claim for defamation. In November 2019, the Company moved to compel arbitration related to claims asserted by Corcoran and moved to dismiss all of the counts. In June 2020, the Court denied the motion to dismiss and denied the motion to compel arbitration as moot, granting Plaintiffs leave to amend the complaint as to claims asserted by Corcoran without prejudice to the Defendants' ability to move to compel or dismiss the second amended complaint. On July 3, 2020, Plaintiffs filed their second amended complaint. On December 18, 2020, the Court denied the Company’s motion to compel arbitration on Plaintiffs’ second amended complaint without prejudice. Defendants’ answer to the second amended complaint and counterclaims were filed on January 28, 2021. Additionally, the Company filed its appeal of the lower Court’s denial of the Company’s motion to dismiss and motion to compel arbitration on February 1, 2021. On June 1, 2021, the First Department affirmed the lower Court’s denial of the Company’s motion to compel arbitration. On September 28, 2022, the Company and Plaintiffs executed an agreement to resolve the matter. During the three months ended September 30, 2022, the Company recognized an expense of $10.5 million within General and administrative expense in the accompanying consolidated statements of operations in connection with this matter. Letter of Credit Agreements The Company has irrevocable letters of credit with various financial institutions, primarily related to security deposits for leased facilities. As of September 30, 2022 and December 31, 2021, the Company was contingently liable for $49.2 million and $54.5 million, respectively, under these letters of credit. As of September 30, 2022, $31.8 million and $17.4 million of these letters of credit were collateralized by the Revolving Credit Facility and cash and cash equivalents, respectively. As of December 31, 2021, $30.3 million and $24.2 million of these letters of credit were collateralized by the Revolving Credit Facility and cash and cash equivalents, respectively. Escrow and Trust Deposits As a service to its home buyers and sellers, the Company administers escrow and trust deposits, which represent undistributed amounts for the settlement of real estate transactions. The escrow and trust deposits totaled $186.1 million and $172.1 million as of September 30, 2022 and December 31, 2021, respectively. These deposits are not assets of the Company and therefore are excluded from the accompanying condensed consolidated balance sheets. However, the Company remains contingently liable for the disposition of these deposits.

Preferred Stock and Common stoc

Preferred Stock and Common stock	9 Months Ended
	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Preferred Stock and Common stock	Preferred Stock and Common Stock Undesignated Preferred Stock In April 2021, the Company adopted a restated certificate of incorporation, which authorizes the Company to issue up to 25.0 million shares of undesignated preferred stock with a $0.00001 par value per share. As of September 30, 2022, there are no shares of the Company’s preferred stock issued and outstanding. Common Stock In February 2021, the Company approved the establishment of Class C common stock and an agreement with the Company’s Chief Executive Officer to exchange his Class A common stock for Class C common stock. On March 31, 2021, in connection with the effectiveness of the registration statement for the Company’s IPO, 15.2 million shares of Class A common stock held by the Company’s Chief Executive Officer were automatically exchanged for an equivalent number of shares of Class C common stock. In addition, any Class A common stock issued to the Company’s Chief Executive Officer from RSU awards granted prior to February 2021 are able to be exchanged for Class C common stock. Each share of Class C common stock is entitled to twenty votes per share and will be convertible at any time into one share of Class A common stock and will automatically convert into Class A common stock under certain “sunset” provisions. Other than certain permitted transfers for estate planning purposes, upon a transfer of Class C common stock, the Class C common stock will automatically convert into Class A common stock. In April 2021, the Company adopted a restated certificate of incorporation and changed its authorized capital stock to consist of 12,500.0 million shares of Class A common stock, 1,250.0 million shares of Class B common stock and 100.0 million shares of Class C common stock. As of September 30, 2022 and December 31, 2021, the Company has three classes of common stock: Class A common stock, Class B common stock and Class C common stock. Each class has par value of $0.00001. The following tables reflect the authorized, issued and outstanding shares for each of the classes of common stock as of September 30, 2022 and December 31, 2021: September 30, 2022 Shares Shares Shares Class A common stock 12,500,000,000 416,054,008 416,054,008 Class B common stock 1,250,000,000 — — Class C common stock 100,000,000 18,014,611 18,014,611 Total 13,850,000,000 434,068,619 434,068,619 December 31, 2021 Shares Shares Shares Class A common stock 12,500,000,000 391,912,514 391,912,514 Class B common stock 1,250,000,000 — — Class C common stock 100,000,000 17,355,237 17,355,237 Total 13,850,000,000 409,267,751 409,267,751 Holders of Class A common stock are entitled to one vote per share. Holders of Class B common stock are not entitled to vote. Holders of Class C common stock are entitled to twenty votes per share. Each share of Class C common stock is convertible at any time at the option of the holder into one share of Class A common stock. Each share of Class C common stock will automatically convert into a share of Class A common stock upon sale or transfer, except for certain permitted transfers.

Stock-Based Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Stock-Based Compensation	Stock-Based Compensation 2012 Stock Incentive Plan In October 2012, the Company adopted the 2012 Stock Incentive Plan (the “2012 Plan”). Under the 2012 Plan, employees and non-employees could be granted stock options, RSUs and other stock-based awards, including awards earned in connection with the Agent Equity Program. Generally, these awards were based on stock agreements with a maximum ten-year term for stock options and a maximum seven-year term for RSUs, subject to board approval. 2021 Equity Incentive Plan In February 2021, the Company’s board of directors and stockholders adopted and approved the 2021 Equity Incentive Plan (the “2021 Plan”), with an initial pool of 29.7 million shares of common stock available for granting stock-based awards plus any reserved shares of common stock not issued or subject to outstanding awards granted under the 2012 Plan. In addition, on January 1 st of each year beginning in 2022 and continuing through 2031, the aggregate number of shares of common stock authorized for issuance under the 2021 Plan shall be increased automatically by the number of shares equal to 5% of the total number of outstanding shares of common stock and outstanding shares of preferred stock (on an as converted to common stock basis) on the immediately preceding December 31 st , although the Company’s board of directors or one of its committees may reduce the amount of such increase in any particular year. The 2021 Plan became effective on March 30, 2021 and as of that date, the Company ceased granting new awards under the 2012 Plan and all remaining shares available under the 2012 Plan were transferred to the 2021 Plan. Effective January 1, 2022, the shares available for future grants were increased by an additional 20.5 million shares as a result of the annual increase provision described above. As of September 30, 2022, there were 37.9 million shares available for future grants under the 2021 Plan, inclusive of those shares transferred from the 2012 Plan. 2021 Employee Stock Purchase Plan In February 2021, the Company’s board of directors and stockholders adopted and approved the 2021 Employee Stock Purchase Plan (the “ESPP”), which authorized purchase rights to the Company’s employees or to employees of its designated affiliates. In addition, on January 1 st of each year beginning in 2022 and continuing through 2031, the aggregate number of shares of common stock authorized for issuance under the ESPP shall be increased automatically by the number of shares equal to 1% of the total number of outstanding shares of common stock and outstanding shares of preferred stock (on an as converted to common stock basis) on the immediately preceding December 31 st , although the Company’s board of directors or one of its committees may reduce the amount of the increase in any particular year. No more than 150.0 million shares of common stock may be issued over the term of the ESPP, subject to certain exceptions set forth in the ESPP. The ESPP initially authorized the issuance of 7.4 million shares of common stock and effective January 1, 2022, the authorized shares increased by 3.9 million shares as a result of the annual increase provision described above. As of September 30, 2022, 10.7 million shares of Class A common stock remain available for grant under the ESPP. The ESPP permits employees to purchase shares of the Company’s Class A common stock through payroll deductions accumulated during six-month offering periods up to a maximum value of $12,500 per offering period. The offering periods begin each February and August, or such other period determined by the Compensation Committee. On each purchase date, eligible employees may purchase the shares at a price per share equal to 85% of the lesser of (1) the fair market value of the Company’s Class A common stock on the first trading day of the offering period, or (2) the fair market value of the Company’s Class A common stock on the purchase date, as defined in the ESPP. During the three and nine months ended September 30, 2022, the Company issued 0.6 million shares of Class A common stock under the ESPP. The Company recognized $0.7 million and $1.7 million of stock-based compensation expense related to the ESPP during the three and nine months ended September 30, 2022, respectively. As of September 30, 2022, $0.7 million has been withheld on behalf of employees for a future purchase under the ESPP. Stock Options A summary of stock option activity under the 2012 Plan and the 2021 Plan, including 1.1 million stock options that were granted outside of the 2012 Plan in 2019, is presented below (in millions, except share and per share amounts): Number of Weighted Average Weighted Average Aggregate Intrinsic Value (1) Balance as of December 31, 2021 54,525,539 $ 5.30 7.1 $ 221.3 Granted 324,128 5.00 Exercised (3,949,244) 2.15 Forfeited (3,347,152) 6.89 Balance as of September 30, 2022 47,553,271 $ 5.45 6.2 $ 8.5 Exercisable and vested at September 30, 2022 35,623,436 $ 4.59 5.6 $ 8.5 (1) The aggregate intrinsic values have been calculated using the Company’s closing stock prices of $2.32 and $9.09 as of September 30, 2022 and December 31, 2021, respectively. During the nine months ended September 30, 2022 and 2021, the intrinsic value of options exercised was $20.1 million and $97.6 million, respectively. Early Exercise of Stock Options A majority of the stock options granted under the 2012 Plan originally provided option holders the right to elect to exercise unvested options in exchange for restricted common stock. Shares received from such early exercises are subject to repurchase in the event of the optionee’s termination of service until the stock options are fully vested at the lesser of the original issuance price or the fair value of the Company’s common stock. As of September 30, 2022, 0.1 million shares of common stock received by holders from an early exercise were subject to repurchase. The cash proceeds received for unvested shares of common stock recorded within Accrued expenses and other current liabilities and Other non-current liabilities in the condensed consolidated balance sheets was $0.6 million and $0.2 million, respectively, as of September 30, 2022. Amounts recorded are transferred into Common stock and Additional paid-in capital within the condensed consolidated balance sheets as the shares vest. During the nine months ended September 30, 2022, no stock options were early exercised. Restricted Stock Units A summary of RSU activity under the 2012 Plan and the 2021 Plan is presented below: Number of Awards Weighted Average Balance as of December 31, 2021 54,517,930 $ 10.29 Granted 32,008,264 7.09 Vested and converted to common stock (1) (23,234,043) 9.05 Forfeited (16,935,124) 11.26 Balance as of September 30, 2022 46,357,027 $ 8.35 (1) During the nine months ended September 30, 2022, the Company net settled all RSUs through which it issued an aggregate of 23.2 million shares of Class A common stock and withheld an aggregate of 3.3 million shares of Class A common st ock to satisfy $19.5 million of tax withholding obligations on behalf of the Company’s employees. Included in the table above are 17.2 million RSUs that only vest upon the satisfaction of both (i) a service-based vesting condition and (ii) the achievement of performance-based vesting conditions that remain outstanding as of September 30, 2022. The performance-based vesting conditions provide that 12.5% of the shares subject to the RSUs will vest subject to the achievement of a market price per share of $23.14 of the Company's Class A common stock. An additional 12.5% of the shares subject to the RSUs will vest upon the achievement of a market price per share of the Company's Class A common stock at each of 200%, 250%, 300%, 350%, 400%, 450% and 500% of the reference price. Agent Equity Program In connection with the 2021 Agent Equity Program, the Company recognized a total of $100.0 million in stock-based compensation expense of which $84.8 million was recognized during the year ended December 31, 2021 and $15.2 million was recognized during the nine months ended September 30, 2022. In February 2022, the Company granted 13.6 million RSUs, which immediately vested and converted to Class A common stock in connection with the 2021 Agent Equity Program. Prior to the issuance of the underlying RSUs, the stock-based compensation expense associated with these awards was recorded as a liability and $100.0 million was ultimately reclassified to Additional paid-in capital at the end of the vesting period when the underlying RSUs were granted. For the nine months ended September 30, 2022, the Company recognized stock-based compensation expense and an associated liability of $19.4 million in connection with RSUs to be granted as a part of the 2022 Agent Equity Program. The associated liability is recorded within Accrued expenses and other current liabilities in the condensed consolidated balance sheets. Stock-Based Compensation Expense Total stock-based compensation expense included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2022 and 2021 is as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Commissions and other related expense $ 12.7 $ 26.3 $ 36.1 $ 82.6 Sales and marketing 10.8 10.3 32.7 27.9 Operations and support 3.9 4.5 12.3 12.3 Research and development 9.4 13.2 45.2 76.2 General and administrative 13.3 16.8 46.8 93.9 Total stock-based compensation expense $ 50.1 $ 71.1 $ 173.1 $ 292.9 As more fully described in Note 1 – “Business and Basis of Presentation”, the Company recognized $148.5 million in stock-based compensation expense in connection with the effectiveness of the Company’s IPO registration statement on March 31, 2021. Stock-based compensation expense for the nine months ended September 30, 2021 includes the following amounts related to a one-time acceleration of stock-based compensation expense in connection with the IPO (in millions): IPO Related Commissions and other related expense $ 41.7 Sales and marketing 1.8 Operations and support 3.1 Research and development 46.9 General and administrative 55.0 Total stock-based compensation expense $ 148.5 As of September 30, 2022, unrecognized stock-based compensation expense totaled $367.2 million and is expected to be recognized over a weighted-average period of 2.6 years. The Company has not recognized any tax benefits from stock-based compensation as a result of the full valuation allowance maintained on its deferred tax assets.

Income Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2022
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes The Company recognized no benefit from income taxes for the three months ended September 30, 2022 and a benefit of $1.4 million for the nine months ended September 30, 2022. Additionally, the Company incurred current tax expense from its operations in India, which was fully offset by a deferred tax benefit for future alternative minimum tax credits. The Company recognized a benefit from income taxes of $1.3 million and $3.3 million, respectively, for the three and nine months ended September 30, 2021. The Company continues to maintain a full valuation allowance on all domestic net deferred tax assets based on numerous factors including estimated future taxable income and historic profitability. The Company does not have any amount recorded related to uncertain tax positions as of the period ended September 30, 2022 nor does it expect a substantial increase in the next 12 months. If applicable, the Company recognizes interest and penalties related to uncertain tax positions in the income tax provision. The U.S. is the Company’s only material tax jurisdiction. The Company is generally no longer subject to U.S. federal examination by the Internal Revenue Service (“IRS”) for years before 2015. The IRS and state taxing authorities can subject the Company to audit dating back to 2012 when the Company begins to utilize its net operating loss carryforwards.

Net Loss Per Share Attributable

Net Loss Per Share Attributable to Compass, Inc.	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Net Loss Per Share Attributable to Compass, Inc.	Net Loss Per Share Attributable to Compass, Inc. The Company computes net loss per share under the two-class method required for multiple classes of common stock and participating securities. The rights, including the liquidation and dividend rights, of the Class A common stock, Class B common stock and Class C common stock are substantially identical, other than voting rights. Accordingly, the net loss per share attributable to Compass, Inc. will be the same for Class A common stock, Class B common stock and Class C common stock on an individual or combined basis. The following table sets forth the computation of basic and diluted net loss per share attributable to Compass, Inc. (in millions, except share and per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Numerator: Net loss attributable to Compass, Inc. $ (154.2) $ (99.8) $ (443.4) $ (319.3) Denominator: Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., basic and diluted 432,459,739 392,979,596 425,338,530 300,303,624 Net loss per share attributable to Compass, Inc., basic and diluted $ (0.36) $ (0.25) $ (1.04) $ (1.06) The following participating securities were excluded from the computation of diluted net loss per share attributable to Compass, Inc. for the periods presented, because including them would have been anti-dilutive (on an as-converted basis): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Outstanding stock options 47,553,271 58,488,132 47,553,271 58,488,132 Outstanding RSUs 46,357,027 59,482,502 46,357,027 59,482,502 Shares subject to the Employee Stock Purchase Plan 733,515 — 733,515 — Unvested early exercised stock options 135,360 1,181,720 135,360 1,181,720 Unvested common stock 156,252 574,926 156,252 574,926 Total 94,935,425 119,727,280 94,935,425 119,727,280

Compass Concierge Receivables a

Compass Concierge Receivables and Allowance for Credit Losses	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Compass Concierge Receivables and Allowance for Credit Losses	Compass Concierge Receivables and Allowance for Credit Losses In 2018, the Company launched the Compass Concierge Program for home sellers who have engaged Compass as their exclusive listing agent. The initial program was based on a services model (“Concierge Classic”) provided by Compass Concierge, LLC (“Compass Concierge”), which included items such as consultation on suggested cosmetic updates or modifications to a specific property or guidance on securing licensed contractors or vendors to perform non-structural property improvements. The Concierge Classic program provided for the payment of the up-front costs of specified home improvement services provided by unrelated vendors. During the three months ended September 30, 2022, the Company substantially ceased providing new payments under the Concierge Classic program. In 2019, the Compass Concierge program was expanded to include a loan program underwritten by an independent third-party lender (the “Lender”) through a commercial arrangement with Compass Concierge (“Concierge Capital”). Under the Concierge Capital program, the Lender originates and services unsecured consumer loans to home sellers following its independent underwriting process pursuant to program-level criteria provided by the Company. Pursuant to the Company’s agreement with the Lender, the consumer loans are unsecured, interest-free and have no associated fees except for late fees that the Lender may charge in its sole discretion. The Company has no right or obligation with respect to any individual consumer loan originated by the Lender. Under the agreement, the Company has repayment rights against the Lender in connection with a corporate loan. Payment to the Company for these services under the Concierge Classic program or repayment of the loan funds under the Concierge Capital program is due upon the earlier of a successful home sale, the termination of the listing agreement or one year from the date in which costs were originally funded. Compass Concierge receivables (“Concierge Receivables”) are stated at the amount advanced to the home sellers, net of an estimated allowance for credit losses (“ACL”) in the accompanying condensed consolidated balance sheets. For the three and nine months ended September 30, 2022 and 2021, the Company did not recognize any revenue or earn any fees from the Compass Concierge program. The Company incurs service fees payable to the Lender and incurs bad debt expense in connection with the Compass Concierge program. The Company manages its credit risk by establishing a comprehensive credit policy for the approval of new loans while monitoring and reviewing the performance of its existing Concierge Receivables. Factors considered include but not limited to: • No negative liens or judgements on the property; • Seller’s available equity on the property; • Loan to listing price ratio; • FICO score (only for Concierge Capital program); and • Macroeconomic conditions. Credit Quality The Company monitors credit quality by evaluating various attributes and utilizes such information in its evaluation of the appropriateness of the ACL. Based on the Company’s experience, the key credit quality indicator is whether the underlying properties associated with the Concierge Receivables will be sold or not. Concierge Receivables associated with properties that are eventually sold have a lower credit risk than those that are associated with properties that are not sold. As of September 30, 2022 and December 31, 2021, the amount of outstanding Concierge Receivables related to unsold properties was approximately 98% and 96%, respectively. For Concierge Receivables where repayments have not been triggered (i.e., earlier of (i) sale of the property, (ii) the termination of a listing agreement or (iii) 12 months from the date costs were originally funded), the Company establishes an estimate as to the percentage of underlying properties that will be sold based on historical data. This estimate is updated as of the end of each reporting period. Allowance for credit losses The Company maintains an ACL for the expected credit losses over the contractual life of the Concierge Receivables. The amount of ACL is based on ongoing, quarterly assessments by management. Historical loss experience is generally the starting point when the Company estimates the expected credit losses. The Company then considers whether (i) current conditions, such as the impact of COVID-19 and related economic uncertainty surrounding the pandemic, (ii) future economic conditions and (iii) any potential changes in the Compass Concierge Program that are reasonable and supportable would impact its ACL. The following table summarizes the activity of the ACL for Concierge Receivables for the three and nine months ended September 30, 2022 (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Beginning of period $ 16.3 $ 17.3 Allowances 0.2 1.8 Net write-offs and other (0.9) (3.5) End of period $ 15.6 $ 15.6 Aging Status The Company generally considers Concierge Receivables to be past due after being outstanding for over 30 days after the initial billing. Changes in the Company’s estimate to the ACL are recorded through bad debt expense as Sales and marketing expense in the condensed consolidated statements of operations and individual accounts are charged against the allowance when all reasonable collection efforts are exhausted. The following table presents the aging analysis of Concierge Receivables as of September 30, 2022 (in millions): September 30, 2022 Current $ 69.4 31-90 days past due 1.7 Over 90 days past due 4.7 Total $ 75.8

Restructuring Activities

Restructuring Activities	9 Months Ended
	Sep. 30, 2022
Restructuring and Related Activities [Abstract]
Restructuring Activities	Restructuring Activities During the three months ended June 30, 2022, the Company enacted certain workforce reductions previously disclosed and began winding down Modus Technologies, Inc. (“Modus”), a wholly-owned title and escrow software company, and during the three months ended September 30, 2022, the Company took additional smaller non-material workforce reduction actions and committed to and communicated an additional separate workforce reduction (collectively, the "Workforce Reductions"). The Workforce Reductions are part of a broader plan by the Company to take meaningful actions to improve the alignment between the Company’s organizational structure and its long-term business strategy, drive cost efficiencies enabled by the Company’s technology and other competitive advantages and continue to drive toward profitability and positive free cash flow. In addition to the aforementioned Workforce Reductions, restructuring actions have included and are expected to include, but not be limited to, a reduction in U.S. hiring and backfills resulting from attrition; a reduction in spend through third party vendors; eliminating the use of incentives when recruiting new agents and reducing incentives for existing agents; a planned pause in M&A activity and new market expansion; and a review of occupancy costs with a view to consolidating offices and reducing related costs. As a result of restructuring actions taken during the three and nine months ended September 30, 2022, the Company incurred restructuring costs of $29.0 million and $47.9 million, respectively, resulting from severance and other termination benefits for employees whose roles are being eliminated, lease terminations costs as a result of the accelerated amortization of various right-of-use assets and other restructuring costs, including those costs related to the wind-down of Modus. These costs have been presented within the Restructuring costs line in the condensed consolidated statements of operations. The Company incurred additional non-cash charges of approximately $0.9 million and $7.1 million, respectively, for the three and nine months ended September 30, 2022 associated with the discontinued use of certain intangible assets associated with Modus and charges pertaining to the write-down of fixed assets for certain real estate leases that have been exited, or partially exited. These costs have been included within the Depreciation and amortization line in the condensed consolidated statements of operations. The following table summarizes the total costs incurred in connection with the Company's restructuring activities taken during the three and nine months ended September 30, 2022 (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Severance related personnel costs $ 25.2 $ 40.0 Lease termination costs 3.5 7.4 Accelerated amortization of intangible assets — 4.6 Write-down of fixed assets 0.9 2.5 Other restructuring activities 0.3 0.5 Total expense $ 29.9 $ 55.0 The total costs incurred in connection with the Company's restructuring activities taken during the three and nine months ended September 30, 2022 were included in the condensed consolidated statements of operations as follows (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Restructuring costs $ 29.0 $ 47.9 Depreciation and amortization 0.9 7.1 Total expense $ 29.9 $ 55.0 As of September 30, 2022, the Company's remaining liability related to restructuring activities was $18.3 million, primarily related to unpaid severance costs, which is included in Accrued expenses and other current liabilities in the condensed consolidated balance sheet. The majority of the remaining liability as of September 30, 2022 is expected to be paid by December 31, 2022.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	9 Months Ended
	Sep. 30, 2022
Accounting Policies [Abstract]
Basis of Presentation	Basis of Presentation The condensed consolidated financial statements include the accounts of the Company and its subsidiaries. All intercompany accounts and transactions have been eliminated in consolidation. The Company’s condensed consolidated financial statements were prepared in accordance with generally accepted accounting principles in the United States of America (“U.S. GAAP”) and include the assets, liabilities, revenues and expenses of all controlled subsidiaries. The condensed consolidated statements of operations include the results of entities acquired from the date of each respective acquisition. Interests held by third parties in consolidated subsidiaries are presented as non-controlling interests, which represents the non-controlling stockholders’ interests in the underlying net assets of the Company’s consolidated subsidiaries. For entities where the Company does not have a controlling interest (financial or operating), the investments in such entities are accounted for using the equity method. The Company applies the equity method of accounting when it has the ability to exercise significant influence over the operating and financial policies of an investee. The Company measures all other investments at fair value with changes in fair value recognized in net income or in the case that an equity investment does not have readily determinable fair values, at cost minus impairment (if any) plus or minus changes resulting from observable price changes in orderly transactions for the identical or a similar investment. The unaudited interim condensed consolidated financial statements and related disclosures have been prepared by management on a basis consistent with the annual consolidated financial statements and, in the opinion of management, include all adjustments necessary for a fair statement of the interim periods presented. The results of the interim periods presented are not necessarily indicative of the results expected for the full year. Certain information and notes normally included in financial statements prepared in accordance with U.S. GAAP have been condensed or omitted under the SEC’s rules and regulations. Accordingly, the unaudited condensed consolidated financial statements and notes included herein should be read in conjunction with the Company’s audited consolidated financial statements and the related notes for the year ended December 31, 2021, included in the 2021 Form 10-K.
Use of Estimates	Use of Estimates The preparation of consolidated financial statements in conformity with U.S. GAAP requires management to make judgments, estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the condensed consolidated financial statements and reported amounts of revenue and expenses during the reporting periods covered by the condensed consolidated financial statements and accompanying notes. These judgments, estimates and assumptions are used for, but not limited to (i) valuation of the Company’s common stock and stock awards, (ii) fair value of acquired intangible assets and goodwill, (iii) fair value of contingent consideration arrangements in connection with business combinations, (iv) incremental borrowing rate used for the Company’s operating leases, (v) useful lives of long-lived assets, (vi) impairment of intangible assets and goodwill, (vii) allowance for Compass Concierge receivables and (viii) income taxes and certain deferred tax assets. The Company determines its estimates and judgments based on historical experience and on various other assumptions that it believes are reasonable under the circumstances. However, actual results could differ from these estimates and these differences may be material.
Business Combinations	Business Combinations Business combinations are accounted for under the acquisition method of accounting. This method requires, among other things, allocation of the fair value of purchase consideration to the tangible and intangible assets acquired and liabilities assumed at their estimated fair values on the acquisition date. The excess of the fair value of purchase consideration over
Stock-Based Compensation	Stock-Based Compensation The Company issues stock-based awards to employees, affiliated agents, service providers and board members. The Company measures compensation expense for all stock-based awards based on the estimated fair value of the awards on the date of grant. Compensation expense is generally recognized on a straight-line basis over the service period based on the vesting requirements. The Company recognizes forfeitures as they occur. For stock options, the Company generally estimates the fair value using the Black-Scholes option pricing model, which requires the input of subjective assumptions, including (i) the fair value of common stock, (ii) the expected stock price volatility, (iii) the expected term of the award, (iv) the risk-free interest rate and (v) expected dividends. In addition to the issuance of RSUs to affiliated agents as compensation for the provision of services, the Company offers RSUs to agents through its Agent Equity Program. The Agent Equity Program offers affiliated agents the ability to elect to have a portion of their commissions earned during a calendar year to be paid in the form of RSUs. RSUs issued in connection with the Agent Equity Program are granted at the beginning of the year following the calendar year in which the commissions were earned and are subject to the terms and conditions of the 2012 Stock Incentive Plan and the 2021 Equity Incentive Plan, as applicable. RSUs granted prior to December 2020 generally vest based upon the satisfaction of both a service-based condition and a liquidity event-based condition. The service-based vesting condition for these awards is generally satisfied over four years, except for the RSUs granted since 2020 associated with the Agent Equity Program, which vested immediately on the date of grant. The liquidity event-based vesting condition is satisfied on the occurrence of a qualifying event, generally defined as a change in control or the effective date of the registration statement for the Company’s IPO. The fair value of these RSUs was measured based on the fair value of the Company’s common stock on the grant date and began to be recognized as expense when both the required service-based vesting condition and the liquidity event-based vesting condition had been achieved using the accelerated attribution method. The liquidity event-based vesting requirement was met on March 31, 2021, the effective date of the Company’s registration statement, see Note 1—“Business and Basis of Presentation—Initial Public Offering .” Beginning in December 2020, the Company began granting RSUs that vest upon the satisfaction of only a service-based vesting condition that generally ranges from one For RSUs to be granted in connection with the Agent Equity Program, the Company determines the value of the stock-based compensation expense at the time the underlying commission is earned and begins to recognize the associated expense on a straight-line basis over the requisite service periods beginning on the closing date of the underlying real estate commission transactions. The stock-based compensation expense is recorded as a liability and will be reclassified to Additional paid-in capital at the end of the vesting period when the underlying RSUs are granted. RSUs granted in connection with the Agent Equity Program are granted in the first quarter of the calendar year following the year in which the underlying commissions were earned.
New Accounting Pronouncements	New Accounting Pronouncements In March 2020, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2020-04, Reference Rate Reform (Topic 848): Facilitation of the Effects of Reference Rate Reform on Financial Reporting . An update was also issued expanding the scope of this guidance. The guidance provides optional expedients and exceptions for applying GAAP to contract modifications, hedging relationships and other transactions affected by reference rate reform if certain criteria are met. The guidance became effective starting March 12, 2020 and may be applied prospectively through December 31, 2022. The Company is evaluating applicable contracts and transactions to determine whether to elect the optional guidance. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In October 2021, the FASB issued ASU 2021-08, Business Combinations (Topic 805): Accounting for Contract Assets and Contract Liabilities from Contracts with Customers . The guidance amends ASC 805 to require acquiring entities to apply Topic 606 to recognize and measure contract assets and contract liabilities in a business combination. The amendment is effective for public companies with fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The amendment should be applied prospectively to business combinations occurring on or after the effective date. Early adoption is permitted. The adoption of this standard is not expected to have a material impact on the Company’s consolidated financial statements. In March 2022, the FASB issued ASU 2022-02, Financial Instruments - Credit Losses (Topic 326) - Troubled Debt Restructurings and Vintage Disclosures, which requires enhanced disclosure of certain loan refinancings and restructurings by creditors when a borrower is experiencing financial difficulty while eliminating certain current recognition and measurement accounting guidance. This ASU also requires the disclosure of current-period gross write-offs by year of origination for financing receivables and net investments in leases. The amendments in this update are effective for fiscal years beginning after December 15, 2022, including interim periods within those fiscal years. The adoption of this standard is currently being evaluated and is not expected to have a material impact on the Company’s consolidated financial statements.

Acquisitions (Tables)

Acquisitions (Tables)	9 Months Ended
	Sep. 30, 2022
Business Combination and Asset Acquisition [Abstract]
Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis	Changes in contingent consideration measured at fair value on a recurring basis were as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Opening balance $ 21.7 $ 33.0 $ 24.4 $ 39.8 Acquisitions — 0.7 3.6 5.4 Payments and issuances (4.6) (2.7) (10.6) (13.7) Fair value gains included in net loss (1.6) (3.9) (1.9) (4.4) Closing balance $ 15.5 $ 27.1 $ 15.5 $ 27.1

Fair Value of Financial Asset_2

Fair Value of Financial Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2022
Fair Value Disclosures [Abstract]
Summary of Fair Value Measurements of Our Financial Instruments	The following table presents the balances of contingent consideration as presented in the condensed consolidated balance sheets (in millions): September 30, 2022 December 31, 2021 Accrued expenses and other current liabilities $ 9.5 $ 12.9 Other non-current liabilities 6.0 11.5 Total contingent consideration $ 15.5 $ 24.4

Preferred Stock and Common st_2

Preferred Stock and Common stock (Tables)	9 Months Ended
	Sep. 30, 2022
Stockholders' Equity Note [Abstract]
Summary of Stock by Class	The following tables reflect the authorized, issued and outstanding shares for each of the classes of common stock as of September 30, 2022 and December 31, 2021: September 30, 2022 Shares Shares Shares Class A common stock 12,500,000,000 416,054,008 416,054,008 Class B common stock 1,250,000,000 — — Class C common stock 100,000,000 18,014,611 18,014,611 Total 13,850,000,000 434,068,619 434,068,619 December 31, 2021 Shares Shares Shares Class A common stock 12,500,000,000 391,912,514 391,912,514 Class B common stock 1,250,000,000 — — Class C common stock 100,000,000 17,355,237 17,355,237 Total 13,850,000,000 409,267,751 409,267,751

Stock-Based Compensation (Table

Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2022
Share-Based Payment Arrangement [Abstract]
Summary of Stock Option Activity	A summary of stock option activity under the 2012 Plan and the 2021 Plan, including 1.1 million stock options that were granted outside of the 2012 Plan in 2019, is presented below (in millions, except share and per share amounts): Number of Weighted Average Weighted Average Aggregate Intrinsic Value (1) Balance as of December 31, 2021 54,525,539 $ 5.30 7.1 $ 221.3 Granted 324,128 5.00 Exercised (3,949,244) 2.15 Forfeited (3,347,152) 6.89 Balance as of September 30, 2022 47,553,271 $ 5.45 6.2 $ 8.5 Exercisable and vested at September 30, 2022 35,623,436 $ 4.59 5.6 $ 8.5
Summary of Restricted Stock Units Activity	A summary of RSU activity under the 2012 Plan and the 2021 Plan is presented below: Number of Awards Weighted Average Balance as of December 31, 2021 54,517,930 $ 10.29 Granted 32,008,264 7.09 Vested and converted to common stock (1) (23,234,043) 9.05 Forfeited (16,935,124) 11.26 Balance as of September 30, 2022 46,357,027 $ 8.35 (1) During the nine months ended September 30, 2022, the Company net settled all RSUs through which it issued an aggregate of 23.2 million shares of Class A common stock and withheld an aggregate of 3.3 million shares of Class A common st ock to satisfy $19.5 million of tax withholding obligations on behalf of the Company’s employees.
Summary of Share-based Payment Arrangement, Expensed and Capitalized, Amount	Total stock-based compensation expense included in the condensed consolidated statements of operations for the three and nine months ended September 30, 2022 and 2021 is as follows (in millions): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Commissions and other related expense $ 12.7 $ 26.3 $ 36.1 $ 82.6 Sales and marketing 10.8 10.3 32.7 27.9 Operations and support 3.9 4.5 12.3 12.3 Research and development 9.4 13.2 45.2 76.2 General and administrative 13.3 16.8 46.8 93.9 Total stock-based compensation expense $ 50.1 $ 71.1 $ 173.1 $ 292.9 IPO Related Commissions and other related expense $ 41.7 Sales and marketing 1.8 Operations and support 3.1 Research and development 46.9 General and administrative 55.0 Total stock-based compensation expense $ 148.5

Net Loss Per Share Attributab_2

Net Loss Per Share Attributable to Compass, Inc. (Tables)	9 Months Ended
	Sep. 30, 2022
Earnings Per Share [Abstract]
Summary of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders	The following table sets forth the computation of basic and diluted net loss per share attributable to Compass, Inc. (in millions, except share and per share amounts): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Numerator: Net loss attributable to Compass, Inc. $ (154.2) $ (99.8) $ (443.4) $ (319.3) Denominator: Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., basic and diluted 432,459,739 392,979,596 425,338,530 300,303,624 Net loss per share attributable to Compass, Inc., basic and diluted $ (0.36) $ (0.25) $ (1.04) $ (1.06)
Summary of Computation of Diluted Net Loss Per Share Attributable to Common Stockholders	The following participating securities were excluded from the computation of diluted net loss per share attributable to Compass, Inc. for the periods presented, because including them would have been anti-dilutive (on an as-converted basis): Three Months Ended September 30, Nine Months Ended September 30, 2022 2021 2022 2021 Outstanding stock options 47,553,271 58,488,132 47,553,271 58,488,132 Outstanding RSUs 46,357,027 59,482,502 46,357,027 59,482,502 Shares subject to the Employee Stock Purchase Plan 733,515 — 733,515 — Unvested early exercised stock options 135,360 1,181,720 135,360 1,181,720 Unvested common stock 156,252 574,926 156,252 574,926 Total 94,935,425 119,727,280 94,935,425 119,727,280

Compass Concierge Receivables_2

Compass Concierge Receivables and Allowance for Credit Losses (Tables)	9 Months Ended
	Sep. 30, 2022
Receivables [Abstract]
Summary of ACL for Concierge Receivables	The following table summarizes the activity of the ACL for Concierge Receivables for the three and nine months ended September 30, 2022 (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Beginning of period $ 16.3 $ 17.3 Allowances 0.2 1.8 Net write-offs and other (0.9) (3.5) End of period $ 15.6 $ 15.6
Summary of Aging Analysis of Concierge Receivables	The following table presents the aging analysis of Concierge Receivables as of September 30, 2022 (in millions): September 30, 2022 Current $ 69.4 31-90 days past due 1.7 Over 90 days past due 4.7 Total $ 75.8

Restructuring Activities (Table

Restructuring Activities (Tables)	9 Months Ended
	Sep. 30, 2022
Restructuring and Related Activities [Abstract]
Summary of restructuring costs	The following table summarizes the total costs incurred in connection with the Company's restructuring activities taken during the three and nine months ended September 30, 2022 (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Severance related personnel costs $ 25.2 $ 40.0 Lease termination costs 3.5 7.4 Accelerated amortization of intangible assets — 4.6 Write-down of fixed assets 0.9 2.5 Other restructuring activities 0.3 0.5 Total expense $ 29.9 $ 55.0 The total costs incurred in connection with the Company's restructuring activities taken during the three and nine months ended September 30, 2022 were included in the condensed consolidated statements of operations as follows (in millions): Three Months Ended September 30, 2022 Nine Months Ended September 30, 2022 Restructuring costs $ 29.0 $ 47.9 Depreciation and amortization 0.9 7.1 Total expense $ 29.9 $ 55.0

Business and Basis of Present_2

Business and Basis of Presentation - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions			1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 01, 2021	Mar. 31, 2021	Apr. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2023	Dec. 31, 2021	Dec. 31, 2020
Date of incorporation						Oct. 04, 2012
Proceeds from issuance of common stock upon initial public offering, net of offering costs						$ 0	$ 439.6
Conversion of convertible preferred stock to common stock in connection with the initial public offering (in shares)			223,000,000
Stock based compensation expense				$ 50.1	$ 71.1	173.1	292.9
Operating Expenses				1,645.5	$ 1,844.1	5,347.4	5,129.8
Cash and cash equivalents				354.9		354.9			$ 618.3
Minimum | Forecast
Operating Expenses								$ 1,050
Maximum | Forecast
Operating Expenses								$ 1,150
Revolving Credit Facility
Line of credit facility, available borrowing capacity				$ 318.2		$ 318.2
IPO Related Expense
Stock based compensation expense		$ 148.5					$ 148.5
Additional Paid-in Capital
Conversion of convertible preferred stock to common stock in connection with the initial public offering			$ 1,400
IPO
Issuance of common stock in connection with the initial public offering, net of offering costs (in shares)	26,300,000
Sale of stock issue price per share (in dollars per share)	$ 18
Proceeds from issuance of common stock upon initial public offering, net of offering costs	$ 438.7
Payments of deferred offering costs	$ 11
Deferred offering costs										$ 0.9

Summary of Significant Accoun_3

Summary of Significant Accounting Policies - Additional Information (Detail) - Restricted Stock Units		9 Months Ended
	Nov. 30, 2020	Sep. 30, 2022
Accounting Policies [Line Items]
Share based compensation by share based payment arrangement service based vesting period	4 years
Minimum
Accounting Policies [Line Items]
Share based compensation by share based payment arrangement service based vesting period		1 year
Maximum
Accounting Policies [Line Items]
Share based compensation by share based payment arrangement service based vesting period		5 years

Acquisitions - Additional Infor

Acquisitions - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Business Acquisition [Line Items]
Payment to acquire business net of cash acquired			$ 15,000,000	$ 127,300,000
Goodwill	$ 198,500,000		198,500,000			$ 188,300,000
Contingent consideration liability fixed in value	4,700,000		4,700,000
Contingent liabilities undiscounted maximum payment	15,500,000		15,500,000
Future consideration to be paid to the acquirees	37,200,000		37,200,000
Compensation expenses	$ 3,200,000	$ 7,500,000	$ 14,600,000	$ 18,900,000
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage
Business Acquisition [Line Items]
Ownership interest acquired (in percent)	100%		100%
Payment to acquire business net of cash acquired			$ 12,100,000
Additional cash payable	$ 3,600,000		3,600,000
Recognized identifiable assets and liabilities assumed, other assets	1,000,000		1,000,000
Recognized identifiable assets and liabilities assumed, other liabilities	2,500,000		2,500,000
Goodwill	8,800,000		8,800,000
Goodwill, expected tax deductible amount	0		$ 0
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Forecast
Business Acquisition [Line Items]
Goodwill, expected tax deductible amount					$ 2,600,000
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Minimum
Business Acquisition [Line Items]
Useful life (in years)			3 years
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Maximum
Business Acquisition [Line Items]
Useful life (in years)			5 years
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Customer Relationships
Business Acquisition [Line Items]
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill	8,100,000		$ 8,100,000
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Trademarks
Business Acquisition [Line Items]
Recognized identifiable assets and liabilities assumed, intangible assets, other than goodwill	$ 1,100,000		1,100,000
Title Insurance and Escrow Settlement Services Company and Real Estate Brokerage | Common Class A
Business Acquisition [Line Items]
Equity interest issued or issuable			$ 800,000

Acquisitions - Summary of Chang

Acquisitions - Summary of Changes in Contingent Consideration Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Business Combination and Asset Acquisition [Abstract]
Opening balance	$ 21.7	$ 33	$ 24.4	$ 39.8
Acquisitions	0	0.7	3.6	5.4
Payments and issuances	(4.6)	(2.7)	(10.6)	(13.7)
Fair value gains included in net loss	(1.6)	(3.9)	(1.9)	(4.4)
Closing balance	$ 15.5	$ 27.1	$ 15.5	$ 27.1

Fair Value of Financial Asset_3

Fair Value of Financial Assets and Liabilities - Additional Information (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Inputs, Level 3
Contingent consideration fair value disclosure	$ 15.5	$ 24.4
Cash And Money Market Funds [Member] | Fair Value, Inputs, Level 1
Cash and cash Equivalents, fair value disclosure	$ 354.9	$ 618.3

Fair Value of Financial Asset_4

Fair Value of Financial Assets and Liabilities - Balances of Contingent Consideration (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Jun. 30, 2022	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Dec. 31, 2020
Fair Value Disclosures [Abstract]
Accrued expenses and other current liabilities	$ 9.5		$ 12.9
Other non-current liabilities	6		11.5
Total contingent consideration	$ 15.5	$ 21.7	$ 24.4	$ 27.1	$ 33	$ 39.8

Debt - Additional Information (

Debt - Additional Information (Detail) - USD ($)			9 Months Ended
	Aug. 05, 2022	Jul. 29, 2021	Sep. 30, 2022	Dec. 31, 2021	Mar. 31, 2021	Jul. 31, 2020
Debt [Line Items]
Letters of credit			$ 49,200,000	$ 54,500,000
Concierge Revolving Credit Facility
Debt [Line Items]
Maximum borrowing capacity						$ 75,000,000
Debt instrument interest rate (in percent)			5.95%
Line of credit facility expiration month and year			2024
Covenant compliance			the Company was in compliance with the covenants under the Second A&R Concierge Facility.
Concierge Revolving Credit Facility | Concierge Facility Used Greater Than Fifty Percent
Debt [Line Items]
Unused capacity commitment fee (in percent)		0.35%
Line of credit facility, unused capacity, commitment fee, threshold		50%
Concierge Revolving Credit Facility | Concierge Facility Used Less Than Fifty Percent
Debt [Line Items]
Unused capacity commitment fee (in percent)		0.50%
Line of credit facility, unused capacity, commitment fee, threshold		50%
Concierge Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt [Line Items]
Debt instrument, basis spread on variable rate		1.85%
Second A&R Concierge Facility | Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate
Debt [Line Items]
Debt instrument, basis spread on variable rate	2.35%
Credit spread on variable rate (in percent)	0.11448%
Revolving Credit Facility
Debt [Line Items]
Maximum borrowing capacity					$ 350,000,000
Debt instrument, basis spread on variable rate			1%
Unused capacity commitment fee (in percent)			0.175%
Line of credit facility expiration month and year			2026
Line of credit facility maximum borrowing capacity sublimit					$ 125,000,000
Outstanding borrowings			$ 0
Revolving Credit Facility | Other Current Assets
Debt [Line Items]
Covenant compliance			the Company was in compliance with the financial covenants under the Revolving Credit Facility.
Revolving Credit Facility | Minimum
Debt [Line Items]
Liquidity required by financial covenants			$ 150,000,000
Revolving Credit Facility | Minimum | Four Fiscal Quarters of 2022
Debt [Line Items]
Required consolidated revenue threshold			2,418,000,000
Revolving Credit Facility | Minimum | Four Fiscal Quarters of 2023
Debt [Line Items]
Required consolidated revenue threshold			3,799,000,000
Revolving Credit Facility | Minimum | Four Fiscal Quarters Thereafter
Debt [Line Items]
Required consolidated revenue threshold			$ 4,668,000,000
Revolving Credit Facility | London Interbank Offered Rate (LIBOR)
Debt [Line Items]
Debt instrument, basis spread on variable rate			1.50%
Revolving Credit Facility | Base Rate
Debt [Line Items]
Debt instrument, basis spread on variable rate			0.50%
Revolving Credit Facility | Fed Funds Effective Rate Overnight Index Swap Rate
Debt [Line Items]
Debt instrument, basis spread on variable rate			0.50%
Revolving Credit Facility | London Interbank Offered Rate (LIBOR) Swap Rate
Debt [Line Items]
Debt instrument, basis spread on variable rate			1%
Revolving Credit Facility | Debt Default Interest Rate
Debt [Line Items]
Debt instrument, basis spread on variable rate			2%
Letter of Credit
Debt [Line Items]
Letters of credit			$ 31,800,000

Commitments and Contingencies -

Commitments and Contingencies - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2022	Dec. 31, 2021
Letters of credit	$ 49.2	$ 54.5
Escrow and trust deposits	186.1	172.1
Realogy Holdings Corp., et al v. Urban Compass, Inc. and Compass Inc.
Litigation settlement expense	10.5
Revolving Credit Facility
Letters of credit	31.8	30.3
Cash and Cash Equivalents
Letters of credit	$ 17.4	$ 24.2

Preferred Stock and Common st_3

Preferred Stock and Common stock - Additional Information (Detail)			9 Months Ended	12 Months Ended
	Mar. 31, 2021 shares	Feb. 28, 2021 vote	Sep. 30, 2022 vote stockClass $ / shares shares	Dec. 31, 2021 stockClass $ / shares shares	Apr. 30, 2021 $ / shares shares
Preferred stock shares outstanding (in shares)			0
Preferred stock, shares issued (in shares)			0
Common stock shares authorized (in shares)			13,850,000,000	13,850,000,000
Number of classes of common stock | stockClass			3	3
Common stock par or stated value per share (in dollars per share) | $ / shares			$ 0.00001	$ 0.00001
Common Class A
Common stock shares authorized (in shares)			12,500,000,000	12,500,000,000
Voting rights, number of votes for each share | vote			1
Common Class B
Common stock shares authorized (in shares)			1,250,000,000	1,250,000,000
Common Class C
Conversion of stock, shares issued (in shares)	15,200,000
Common Stock voting rights		Each share of Class C common stock is entitled to twenty votes
Common stock shares authorized (in shares)			100,000,000	100,000,000
Voting rights, number of votes for each share | vote			20
Number of votes per share of common stock | vote		20
Restated Certificate Of Incorporation [Member] | Undesignated Preferred Stock
Preferred stock, shares authorized (in shares)					25,000,000
Preferred stock, par value (in dollars per share) | $ / shares					$ 0.00001
Restated Certificate Of Incorporation [Member] | Common Class A
Common stock shares authorized (in shares)					12,500,000,000
Restated Certificate Of Incorporation [Member] | Common Class B
Common stock shares authorized (in shares)					1,250,000,000
Restated Certificate Of Incorporation [Member] | Common Class C
Common stock shares authorized (in shares)					100,000,000

Preferred Stock and Common st_4

Preferred Stock and Common stock - Schedule of Stock by Class (Detail) - shares	Sep. 30, 2022	Dec. 31, 2021
Class of Stock [Line Items]
Shares authorized (in shares)	13,850,000,000	13,850,000,000
Shares issued (in shares)	434,068,619	409,267,751
Shares outstanding (in shares)	434,068,619	409,267,751
Class A common stock
Class of Stock [Line Items]
Shares authorized (in shares)	12,500,000,000	12,500,000,000
Shares issued (in shares)	416,054,008	391,912,514
Shares outstanding (in shares)	416,054,008	391,912,514
Class B common stock
Class of Stock [Line Items]
Shares authorized (in shares)	1,250,000,000	1,250,000,000
Shares issued (in shares)	0	0
Shares outstanding (in shares)	0	0
Class C common stock
Class of Stock [Line Items]
Shares authorized (in shares)	100,000,000	100,000,000
Shares issued (in shares)	18,014,611	17,355,237
Shares outstanding (in shares)	18,014,611	17,355,237

Stock-Based Compensation - Addi

Stock-Based Compensation - Additional Information (Detail) - USD ($)			1 Months Ended	3 Months Ended				9 Months Ended		12 Months Ended
	Jan. 01, 2022	Feb. 28, 2021	Feb. 28, 2022	Sep. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of additional shares available for grant (in shares)	20,500,000
Stock based compensation expense				$ 50,100,000		$ 71,100,000		$ 173,100,000	$ 292,900,000
Intrinsic value of options								$ 20,100,000	$ 97,600,000
Market price per share (in dollars per share)				$ 2,320,000				$ 2,320,000		$ 9,090,000
Shares authorized to be repurchased (in shares)				100,000				100,000
Options early exercised (in shares)								0
Unrecognized stock-based compensation expense				$ 367,200,000				$ 367,200,000
Unrecognized stock-based compensation, period of recognition								2 years 7 months 6 days
Accrued Expenses And Other Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds received for unvested shares of common stock								$ 600,000
Other Current Liabilities
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Proceeds received for unvested shares of common stock								$ 200,000
Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Market price per share (in dollars per share)				$ 23.14				$ 23.14
2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)		29,700,000		37,900,000				37,900,000
2021 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense					$ 100,000,000			$ 15,200,000		$ 84,800,000
Outstanding stock options | 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period								10 years
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options (in shares)				46,357,027				46,357,027		54,517,930
Award vesting rights conditions								The performance-based vesting conditions provide that 12.5% of the shares subject to the RSUs will vest subject to the achievement of a market price per share of $23.14 of the Company's Class A common stock. An additional 12.5% of the shares subject to the RSUs will vest upon the achievement of a market price per share of the Company's Class A common stock at each of 200%, 250%, 300%, 350%, 400%, 450% and 500% of the reference price.
Percentage of options (in percent)								12.50%
Granted (in shares)								32,008,264
Restricted Stock Units | Service-based and Performance-based
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested stock options (in shares)				17,200,000				17,200,000
Restricted Stock Units | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued in period (in shares)								23,200,000
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								200%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								250%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								300%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Four
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								350%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Five
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								400%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Six
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								450%
Restricted Stock Units | Common Class A | Share-based Payment Arrangement, Tranche Seven
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting rights threshold (in percent)								500%
Restricted Stock Units | 2012 Stock Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expiration period								7 years
Restricted Stock Units | 2021 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation share-based arrangements, liability										$ 100,000,000
Restricted Stock Units | 2021 Agent Equity Program | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			13,600,000
Restricted Stock Units | 2022 Agent Equity Program
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Deferred compensation share-based arrangements, liability				$ 19,400,000				$ 19,400,000
Shares subject to the Employee Stock Purchase Plan | 2021 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in the shares authorized for issuance as a percentage of shares outstanding (in percent)		5%
Shares subject to the Employee Stock Purchase Plan | 2021 Employee Stock Purchase Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Increase in the shares authorized for issuance as a percentage of shares outstanding (in percent)		1%
Number of ESPP shares authorized (in shares)		7,400,000
Number of additional ESPP shares authorized (in shares)	3,900,000
Purchase period		6 months
Purchase price of common stock, percent of market price (in percent)		85%
Stock based compensation expense				700,000				1,700,000
Employee withholdings for future purchases under the ESPP				$ 700,000				$ 700,000
Shares subject to the Employee Stock Purchase Plan | 2021 Employee Stock Purchase Plan | Common Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)				10,700,000				10,700,000
Maximum employee subscription amount		$ 12,500
Shares issued in period (in shares)				600,000				600,000
Shares subject to the Employee Stock Purchase Plan | 2021 Employee Stock Purchase Plan | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of ESPP shares authorized (in shares)		150,000,000
IPO Based Restricted Stock Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock based compensation expense							$ 148,500,000

Stock-Based Compensation - Summ

Stock-Based Compensation - Summary of Stock Option Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2021	Dec. 31, 2019
Number of Options
Balance, beginning of period (in shares)	54,525,539
Shares purchased under ESPP plan (in shares)	324,128
Options exercised (in shares)	(3,949,244)
Options forfeited (in shares)	(3,347,152)
Balance, end of period (in shares)	47,553,271	54,525,539
Exercisable and vested at end of period (in shares)	35,623,436
Weighted Average Exercise Price
Balance, beginning of period (in dollars per share)	$ 5.30
Options granted (in dollars per share)	5
Options exercised (in dollars per share)	2.15
Options forfeited (in dollars per share)	6.89
Balance, end of period (in dollars per share)	5.45	$ 5.30
Exercisable and vested at end of period (in dollars per shares)	$ 4.59
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]
Balance, weighted-average remaining contractual life (in years)	6 years 2 months 12 days	7 years 1 month 6 days
Exercisable at end of period, weighted-average remaining contractual life (in years)	5 years 7 months 6 days
Balance, aggregate intrinsic value	$ 8.5	$ 221.3
Exercisable and vested at end of period, aggregate intrinsic value	$ 8.5
Closing stock price (in dollars per share)	$ 2,320,000	$ 9,090,000
Outside of 2012 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options early exercised (in shares)			1,100,000

Stock-Based Compensation - Su_2

Stock-Based Compensation - Summary of Restricted Stock Units Activity (Detail) - USD ($) $ / shares in Units, $ in Millions	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Weighted Average Grant Date Fair Value
Taxes paid related to net share settlement of equity	$ 19.5	$ 0
Restricted Stock Units
Number of Awards
Balance as of the beginning of the period (in shares)	54,517,930
Granted (in shares)	32,008,264
Vested and converted to common stock (in shares)	(23,234,043)
Forfeited (in shares)	(16,935,124)
Balance as of the end of period (in shares)	46,357,027
Weighted Average Grant Date Fair Value
Balance as of the beginning of the period (in dollars per share)	$ 8.35		$ 10.29
Granted (in dollars per share)	7.09
Vested (in dollars per share)	9.05
Forfeited (in dollars per share)	11.26
Balance as of the end of period (in dollars per share)	$ 8.35
Taxes paid related to net share settlement of equity	$ 19.5
Common Class A | Restricted Stock Units
Weighted Average Grant Date Fair Value
Shares issued in period (in shares)	23,200,000
Shares withheld for tax withholding obligation (in shares)	3,300,000

Stock-Based Compensation - Shar

Stock-Based Compensation - Share-based Payment Arrangement, Expensed and Capitalized, Amount (Detail) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		$ 50.1	$ 71.1	$ 173.1	$ 292.9
IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense	$ 148.5				148.5
Commissions and other related expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		12.7	26.3	36.1	82.6
Commissions and other related expense | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense					41.7
Sales and marketing
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		10.8	10.3	32.7	27.9
Sales and marketing | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense					1.8
Operations and support
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		3.9	4.5	12.3	12.3
Operations and support | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense					3.1
Research and development
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		9.4	13.2	45.2	76.2
Research and development | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense					46.9
General and administrative
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense		$ 13.3	$ 16.8	$ 46.8	93.9
General and administrative | IPO Related Expense
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]
Stock based compensation expense					$ 55

Income Taxes - Additional Infor

Income Taxes - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Income Tax Disclosure [Abstract]
Benefit from income taxes	$ 0	$ 1,300,000	$ 1,400,000	$ 3,300,000

Net Loss Per Share Attributab_3

Net Loss Per Share Attributable to Compass, Inc. - Schedule of Computation of Basic and Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Numerator:
Net loss attributable to Compass, Inc.	$ (154.2)	$ (99.8)	$ (443.4)	$ (319.3)
Denominator:
Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., basic (in shares)	432,459,739	392,979,596	425,338,530	300,303,624
Weighted-average number of shares outstanding used to compute net loss per share attributable to Compass, Inc., diluted (in shares)	432,459,739	392,979,596	425,338,530	300,303,624
Net loss per share attributable to Compass, Inc., basic (in dollars per share)	$ (0.36)	$ (0.25)	$ (1.04)	$ (1.06)
Net loss per share attributable to Compass, Inc., diluted (in dollars per share)	$ (0.36)	$ (0.25)	$ (1.04)	$ (1.06)

Net Loss Per Share Attributab_4

Net Loss Per Share Attributable to Compass, Inc. - Schedule of Computation of Diluted Net Loss Per Share Attributable to Common Stockholders (Detail) - shares	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	94,935,425	119,727,280	94,935,425	119,727,280
Convertible preferred stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	47,553,271	58,488,132	47,553,271	58,488,132
Outstanding RSUs
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	46,357,027	59,482,502	46,357,027	59,482,502
Shares subject to the Employee Stock Purchase Plan
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	733,515	0	733,515	0
Unvested early exercised stock options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	135,360	1,181,720	135,360	1,181,720
Unvested common stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per share (in shares)	156,252	574,926	156,252	574,926

Compass Concierge Receivables_3

Compass Concierge Receivables and Allowance for Credit Losses - Additional Information (Detail)	Sep. 30, 2022	Dec. 31, 2021
Receivables [Abstract]
Financing receivables related to unsold properties (in percent)	98%	96%

Compass Concierge Receivables_4

Compass Concierge Receivables and Allowance for Credit Losses - Summary of ACL for Concierge Receivables (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Financing Receivable, Allowance for Credit Loss [Roll Forward]
Beginning of period	$ 16.3	$ 17.3
Allowances	0.2	1.8
Net write-offs and other	(0.9)	(3.5)
End of period	$ 15.6	$ 15.6

Compass Concierge Receivables_5

Compass Concierge Receivables and Allowance for Credit Losses - Summary of Aging Analysis of Concierge Receivables (Detail) $ in Millions	Sep. 30, 2022 USD ($)
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 75.8
Current
Financing Receivable, Past Due [Line Items]
Concierge receivables	69.4
31-90 days past due
Financing Receivable, Past Due [Line Items]
Concierge receivables	1.7
Over 90 days past due
Financing Receivable, Past Due [Line Items]
Concierge receivables	$ 4.7

Restructuring Activities - Narr

Restructuring Activities - Narrative (Details) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2022 USD ($)
Restructuring Cost and Reserve [Line Items]
Incurred cost	$ 29.9	$ 55
Unpaid Severance Costs | Q2 2022 Strategic Actions
Restructuring Cost and Reserve [Line Items]
Liabilities related to restructuring costs	18.3	18.3
Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Incurred cost	29	47.9
Depreciation and Amortization
Restructuring Cost and Reserve [Line Items]
Incurred cost	$ 0.9	$ 7.1

Restructuring Activities - Tota

Restructuring Activities - Total Costs Incurred and Expected to be Incurred (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Restructuring Cost and Reserve [Line Items]
Incurred cost	$ 29.9	$ 55
Severance related personnel costs
Restructuring Cost and Reserve [Line Items]
Incurred cost	25.2	40
Lease termination costs
Restructuring Cost and Reserve [Line Items]
Incurred cost	3.5	7.4
Accelerated amortization of intangible assets
Restructuring Cost and Reserve [Line Items]
Incurred cost	0	4.6
Write-down of fixed assets
Restructuring Cost and Reserve [Line Items]
Incurred cost	0.9	2.5
Other restructuring activities
Restructuring Cost and Reserve [Line Items]
Incurred cost	$ 0.3	$ 0.5