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Common stock (Details)	3 Months Ended
Common stock (Details)	Mar. 31, 2022 Vote
Common stock
Common stock voting right	1

X

- Definition

The number of votes for each common stock.

+ References

No definition available.

+ Details

Name:	imnm_CommonStockVotingRight
Namespace Prefix:	imnm_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- References

No definition available.

+ Details

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