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v3.23.2

Commitments and contingencies (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Commitments and contingencies |  |  |  |
Defined contribution | $ 0.1 | $ 0.1 | $ 0.1 | $ 0.1
Product development and regulatory approval milestone payments | 2.6 |  | 2.6 |
Commercial milestone payments | 1.5 |  | 1.5 |
Collaborative agreement, milestone payments made | $ 0.0 | $ 0.1 | $ 0.0 | $ 0.1

X
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- Definition The amount of license fee payable on commercial milestones. + References No definition available. + Details
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Namespace Prefix: | imnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount of license fee payable on product development and regulatory approval milestones. + References No definition available. + Details
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Namespace Prefix: | imnm_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of cost for defined contribution plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI https://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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