Deferred Revenue Recognition Period

No definition available.

Name:	idra_DeferredRevenueRecognitionPeriod
Namespace Prefix:	idra_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The upfront, non-refundable, non-creditable cash payment received under the collaboration agreement.

+ References

No definition available.

+ Details

Name:	idra_UpfrontPaymentReceivedUnderCollaboration
Namespace Prefix:	idra_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 8
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130549-203045

+ Details

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

- Definition

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

+ Details

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

- Details

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

- Details

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

- Details

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

- Details

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

- Details

Name:	srt_ProductOrServiceAxis=idra_AdditionalResearchServicesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Alliance Revenue (Details) - USD ($) $ in Thousands	12 Months Ended
Alliance Revenue (Details) - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Alliance Revenue
Alliance revenue	$ 1,448	$ 662	$ 902
Deferred revenue recognized during the period		600	700
Out-license arrangement
Alliance Revenue
Alliance revenue	1,447
Gsk Collaboration
Alliance Revenue
Alliance revenue		517	863
Upfront payment received under collaboration agreement		$ 2,500	$ 2,500
Deferred revenue recognition period		36 months	36 months
Deferred revenue recognized during the period	0
Vivelix Collaboration
Alliance Revenue
Alliance revenue		$ 56	$ 14
Other
Alliance Revenue
Alliance revenue	$ 1	$ 89	25
Additional Research Services \| Gsk Collaboration
Alliance Revenue
Deferred revenue recognized during the period			$ 100