Common stock.

No definition available.

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- Definition

Maximum price at which the company would offer to sell its shares under the sales agreement.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The gross cash inflow from the additional capital contribution to the entity, before deducting issuance costs.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Definition

Maximum commission percentage on the aggregate gross proceeds that is agreed to be paid under the stock sale agreement.

+ References

No definition available.

+ Details

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- Definition

The value of shares remaining available for future offerings.

+ References

No definition available.

+ Details

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Namespace Prefix:	imnm_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The cash inflow from the additional capital contribution to the entity.

+ References

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+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

Per share or per unit amount of equity securities issued.

+ References

No definition available.

+ Details

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Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of new stock issued during the period.

+ References

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+ Details

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Balance Type:	na
Period Type:	duration

- Details

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- Details

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Common stock - Narratives (Details) - USD ($)	1 Months Ended		6 Months Ended	26 Months Ended
Common stock - Narratives (Details) - USD ($)	Dec. 31, 2025	Jan. 31, 2025	Jun. 30, 2026	Jun. 30, 2026	May 14, 2024
Open Market Sale
Common Stock [Line Items]
Shares issued			0	6,655,587
Offering price of shares					$ 200,000,000
Percentage of commission					3.00%
Gross proceeds from issuance of common shares				$ 65,900,000
Proceeds from issuance of common stock				64,500,000
Value of shares available for future issuance			$ 134,100,000	$ 134,100,000
Public offering
Common Stock [Line Items]
Shares issued	21,418,750	22,258,064
Shares Issued, Price Per Share	$ 21.5	$ 7.75
Proceeds from issuance of common stock	$ 432,400	$ 161,700