Amount of increase (decrease) in operating lease liabilities.

No definition available.

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

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 renewal, 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 50
-Paragraph 3
-Subparagraph (a)(3)
-URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918673-209980

+ Details

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

- 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

+ 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
-Publisher FASB
-Name Accounting Standards Codification
-Topic 842
-SubTopic 20
-Section 45
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977

+ Details

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

Facility Lease - Lessee information (Details) $ in Thousands	1 Months Ended	9 Months Ended		46 Months Ended
	Sep. 30, 2021 USD ($) ft²	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($) ft²	Oct. 31, 2018 USD ($)	Dec. 31, 2021 USD ($)	Feb. 01, 2015 ft²
Lease
Area of leased facility \| ft²	27,280		27,280			8,138
Lease term						1 year
Landlord Provided Free Rent And Lease Incentives				$ 1,900
Lease extension period	2 years		2 years
Increase in operating lease right-of-use asset	$ 2,400	$ 723	$ (1,772)
Increase in the operating lease liability	$ 2,400	777	$ (1,575)
Operating lease right-of-use asset		$ 2,467			$ 3,190