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v3.23.2

Leases (Details) - Office and laboratory space | 6 Months Ended
--- | ---
Jun. 30, 2023 ft² item
Lessee, Lease, Description [Line Items] |
Area | ft² | 11,000
Number of extension | item | 2
Period of extension | 5 years

X
- Definition Represents number of additional extension period. + References No definition available. + Details
Name: | imnm_AdditionalPeriodForExtension
Namespace Prefix: | imnm_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

X
- Definition Represents number of additional option to extend. + References No definition available. + Details
Name: | imnm_NumberOfOptionToExtend
Namespace Prefix: | imnm_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Area of land held. + References No definition available. + Details
Name: | us-gaap_AreaOfLand
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:areaItemType
Balance Type: | na
Period Type: | instant

X
- 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_LesseeLeaseDescriptionLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=imnm_OfficeAndLaboratorySpaceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |