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Summary of Significant Accounting Policies - Schedule of Useful Lives of Property and Equipment (Detail)	12 Months Ended
	Dec. 31, 2021
Leasehold Improvements [Member]
Property Plant And Equipment Useful Lives [Line Items]
Property, Plant and Equipment, Estimated Useful Lives	Lesser of estimated useful life or remaining lease term
Furniture and Fixtures [Member]
Property Plant And Equipment Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	5 years
Software and Software Development Costs [Member]
Property Plant And Equipment Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years
Computer Equipment [Member]
Property Plant And Equipment Useful Lives [Line Items]
Property, Plant and Equipment, Useful Life	3 years

X

- Definition

Property Plant And Equipment Useful Lives.

+ References

No definition available.

+ Details

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Namespace Prefix:	comp_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Describes the periods of time over which an entity anticipates to receive utility from its property, plant and equipment (that is, the periods of time over which an entity allocates the initial cost of its property, plant and equipment).

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 360
-SubTopic 10
-Section 35
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=123364984&loc=d3e1205-110223

+ Details

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Period Type:	duration

X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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- Details

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X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_SoftwareAndSoftwareDevelopmentCostsMember
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X

- Details

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