Area of property subleased.

No definition available.

Name:	crvs_AreaOfPropertySubleased
Namespace Prefix:	crvs_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of increase (decrease) in operating lease liabilities.

+ References

No definition available.

+ Details

Name:	crvs_IncreaseDecreaseInOperatingLeaseLiabilities
Namespace Prefix:	crvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of increase (decrease) in operating lease right of use asset.

+ References

No definition available.

+ Details

Name:	crvs_IncreaseDecreaseInOperatingLeaseRightOfUseAsset
Namespace Prefix:	crvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Represents the amount of lease incentives and free rent that were provided by the landlord.

+ References

No definition available.

+ Details

Name:	crvs_LandlordProvidedFreeRentAndLeaseIncentives
Namespace Prefix:	crvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Amount of sublease income in connection with related party transactions.

+ References

No definition available.

+ Details

Name:	crvs_SubleaseIncomeRelatedParty
Namespace Prefix:	crvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Area of a real estate property.

+ References

No definition available.

+ Details

Name:	us-gaap_AreaOfRealEstateProperty
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:areaItemType
Balance Type:	na
Period Type:	instant

- References

No definition available.

+ Details

Name:	us-gaap_LesseeDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Term of lessee's operating lease, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147478964/842-20-50-3

+ Details

Name:	us-gaap_LesseeOperatingLeaseTermOfContract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

- Definition

Amount of lessee's right to use underlying asset under operating lease.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 842
-SubTopic 20
-Name Accounting Standards Codification
-Section 45
-Paragraph 1
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479041/842-20-45-1

+ Details

Name:	us-gaap_OperatingLeaseRightOfUseAsset
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_BuildingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Facility Lease - Lessee information (Details) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended		46 Months Ended
	Aug. 31, 2021 ft²	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2023 USD ($)	Sep. 30, 2022 USD ($)	Oct. 31, 2018 USD ($)	Dec. 31, 2022 USD ($)	Sep. 30, 2021 ft²	Feb. 01, 2015 ft²
Lease
Increase in operating lease right-of-use asset				$ 794	$ 723
Increase in the operating lease liability				911	777
Operating lease right-of-use asset		$ 1,423		1,423			$ 2,217
Sublease income - related party			$ 147	56	$ 439
Burlingame, California Office
Lease
Area of leased facility \| ft²								27,280	8,138
Lease term									1 year
Landlord Provided Free Rent And Lease Incentives						$ 1,900
Area Of Property Subleased \| ft²	7,585
Sublease income - related party		$ 0		$ 100