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

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- 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

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- 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

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

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