The amount accrued related to the payments, to be made under License agreement.

No definition available.

Name:	ctrv_AccruedPaymentsRelatedToLicenseAgreement
Namespace Prefix:	ctrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Period after written notice received from counterparty in which entity may cure default or breach of contract obligations in order to prevent termination of agreement under the terms of the agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementDefaultOrBreachCurePeriodEntity
Namespace Prefix:	ctrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of initial base payment previously paid under the terms of the agreement.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementInitialBasePaymentMade
Namespace Prefix:	ctrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Maximum period in which payment is considered to be late under the terms of the agreement.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementLatePaymentPeriod
Namespace Prefix:	ctrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Number of occasions in twelve month period in which agreement may be terminated if entity is late on making payment under the terms of the agreement.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementLatePaymentsNumberOfOccasions
Namespace Prefix:	ctrv_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for milestone payments.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementMilestonePayment
Namespace Prefix:	ctrv_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Minimum period for which entity must provide prior written notice in order to terminate agreement on a country by country basis, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementMinimumWrittenNotice
Namespace Prefix:	ctrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum threshold percentage of royalty from patents that are irrevocably adjudicated to be invalid under the terms of agreement.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementPercentageOfRoyaltyMinimum
Namespace Prefix:	ctrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for which entity must provide prior written notice in order to terminate agreement if patent(s) that are irrevocably adjudicated to be invalid exceed royalty threshold under the terms of the agreement, , in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementWrittenNoticePeriodOneEntity
Namespace Prefix:	ctrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period for which entity must provide prior written notice for breach related to confidential information and publication in order to terminate agreement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

Name:	ctrv_AgreementWrittenNoticePeriodTwoEntity
Namespace Prefix:	ctrv_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the percentage of outstanding shares of common stock upon issuance.

+ References

No definition available.

+ Details

Name:	ctrv_PercentageOfOutstandingSharesOfCommonStockUponIssuance
Namespace Prefix:	ctrv_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

For contingent consideration arrangements recognized in connection with a business combination, this element represents an estimate of the high-end of the potential range (undiscounted) of the consideration which may be paid.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)(3)
-URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479

+ Details

Name:	us-gaap_BusinessCombinationContingentConsiderationArrangementsRangeOfOutcomesValueHigh
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

- Definition

Number of shares of stock issued during the period as part of a transaction to acquire assets that do not qualify as a business combination.

+ References

No definition available.

+ Details

Name:	us-gaap_StockIssuedDuringPeriodSharesPurchaseOfAssets
Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	us-gaap_TypeOfArrangementAxis=ctrv_ContributionAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_TypeOfArrangementAxis=ctrv_LicenseAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_TypeOfArrangementAxis=ctrv_BmsAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=ctrv_MarketingFdaApprovalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ContingentConsiderationByTypeAxis=ctrv_AggregateNetSalesAndRoyaltyMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Commitments and Contingencies - License Agreement with Cardiff (Details)			6 Months Ended
	Aug. 05, 2013 shares	Mar. 27, 2007 USD ($) item	Jun. 30, 2018 USD ($)
Contribution Agreement
Agreement
Shares issued for assets (in shares) \| shares	1,125,000
Percentage of outstanding shares of common stock upon issuance	100.00%
License Agreement \| Cardiff
Agreement
Agreement termination notice (in days)		90 days
Default or breach cure period		90 days
Late payment period		1 month
Number of occasions in 12 month period \| item		2
First written notice period		120 days
Royalty threshold rate (as a percent)		30.00%
Second written notice period		90 days
Initial base payment made		$ 270,000
BMS Agreement
Agreement
Initial base payment made		1,000,000
Potential milestone payment		9,000,000
Milestone payments made			$ 0
Milestone payment accrual			$ 0
BMS Agreement \| Marketing FDA Approval
Agreement
Potential milestone payment		3,000,000
BMS Agreement \| Aggregate net sales equal to or greater than $125 million
Agreement
Potential milestone payment		$ 6,000,000