Represents the number of payments receivable as per the contract.

No definition available.

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

- Definition

Period of time for prior written notice to exercise right to terminate agreement.

+ References

No definition available.

+ Details

Name:	immu_RightOfTerminationPriorWrittenNoticePeriod
Namespace Prefix:	immu_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Upfront cash payment and other payments received under collaboration agreement.

+ References

No definition available.

+ Details

Name:	immu_UpfrontCashPaymentAndOtherPaymentsReceivedUnderCollaborationAgreement
Namespace Prefix:	immu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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

- Definition

Revenue earned during the period relating to consideration received from another party for the right to use, but not own, certain of the entity's intangible assets. Licensing arrangements include, but are not limited to, rights to use a patent, copyright, technology, manufacturing process, software or trademark. Licensing fees are generally, but not always, fixed as to amount and not dependent upon the revenue generated by the licensing party. An entity may receive licensing fees for licenses that also generate royalty payments to the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1(e))
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

+ Details

Name:	us-gaap_LicensesRevenue
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_GuaranteeObligationsByNatureAxis=immu_BayerGroupMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Collaboration Agreement (Details)	1 Months Ended	3 Months Ended		9 Months Ended		12 Months Ended
Collaboration Agreement (Details)	Jan. 31, 2017 USD ($)	Mar. 31, 2017 USD ($)	Mar. 31, 2016 USD ($)	Mar. 31, 2017 USD ($) payment	Mar. 31, 2016 USD ($)	Jun. 30, 2015 USD ($)
Guarantor Obligations [Line Items]
Upfront cash payment and other payments received under collaboration agreement				$ 6,000,000
License fee and other revenues	$ 300,000	$ 257,442	$ 266,096	$ 282,556	$ 302,324	$ 1,000,000
The Bayer Group (formerly Algeta ASA) [Member]
Guarantor Obligations [Line Items]
Period of time for prior written notice to exercise right to terminate agreement				3 months
Number of payments receivable per contract \| payment				2