Amount of foregone cash payment accumulated.

No definition available.

Name:	immu_LossContingencyForegoingCashPaymentsAccumulated
Namespace Prefix:	immu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Represents the number of incumbent directors.

+ References

No definition available.

+ Details

Name:	immu_NumberOfIncumbentDirectors
Namespace Prefix:	immu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Represents the number of nominees.

+ References

No definition available.

+ Details

Name:	immu_NumberOfNominees
Namespace Prefix:	immu_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

- Definition

Reflects the estimated amount of loss from the specified contingency as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14435-108349

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 450
-SubTopic 20
-Section 50
-Paragraph 9
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=25496072&loc=d3e14557-108349

+ Details

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

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

+ Details

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

- 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

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

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

- Details

Name:	us-gaap_AwardTypeAxis=immu_RestrictedUnitsWithVestingMarketConditionsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_FiniteLivedIntangibleAssetsByMajorClassAxis=us-gaap_EmploymentContractsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=immu_SullivanAgreementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CounterpartyNameAxis=immu_VenbioActionMember
Namespace Prefix:
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Balance Type:
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Subsequent Events (Details)	May 03, 2017 USD ($) shares	Mar. 13, 2017 item
Goldenberg Agreement [Member] \| Subsequent Event [Member] \| Restricted Units Vesting Based on Certain Market Conditions [Member]
Subsequent Event [Line Items]
Restricted stock units granted in period \| shares	1,500,000
Goldenberg Agreement [Member] \| Employment Agreement [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Total foregoing cash payments	$ 3,600,000
Goldenberg Agreement [Member] \| Employment Agreement [Member] \| Maximum \| Subsequent Event [Member]
Subsequent Event [Line Items]
Arbitration cost incurred	650,000
Sullivan Agreement [Member] \| Employment Agreement [Member] \| Subsequent Event [Member]
Subsequent Event [Line Items]
Total foregoing cash payments	3,400,000
Sullivan Agreement [Member] \| Employment Agreement [Member] \| Maximum \| Subsequent Event [Member]
Subsequent Event [Line Items]
Arbitration cost incurred	$ 650,000
VenBio Action [Member]
Subsequent Event [Line Items]
Number of nominees \| item		4
Number of incumbent directors \| item		3