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Subsequent Events (Details) - USD ($) $ in Millions	Feb. 28, 2017	Feb. 13, 2017
Subsequent Events | Vernalis (R&D) Limited
Subsequent Events
Milestone payments made	$ 3.0	$ 0.0

X

- Definition

The amount of payments to the entity that are required to be made to the counterparty based on achievement of milestones under the license or collaboration agreement.

+ References

No definition available.

+ Details

Name:	crvs_LicenseAndCollaborationAgreementsMilestonePaymentsMade
Namespace Prefix:	crvs_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

+ References

No definition available.

+ Details

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

X

- Details

Name:	us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_CounterpartyNameAxis=crvs_VernalisRAndDLimitedMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: