Percentage of aggregate number of shares outstanding.

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate number of common shares reserved for future issuance.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of cost to be recognized for option under share-based payment arrangement.

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Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition.

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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.

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Gross number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Stock-Based Compensation - Narrative (Details) - USD ($)			3 Months Ended		6 Months Ended
	May 21, 2024	Jul. 23, 2021	Jun. 30, 2026	Jun. 30, 2025	Jun. 30, 2026	Jun. 30, 2025	Jun. 11, 2026	Dec. 31, 2025	Mar. 20, 2025
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)	13 months
Granted (in shares)					2,993,621
Exercise price (in dollars per share)					$ 4.87
Outstanding options (in shares)			10,964,703		10,964,703			8,250,958
Stock-based compensation expense	$ 600,000		$ 1,627,909	$ 1,524,943	$ 3,264,583	$ 3,217,210
Grant date weighted average fair value (in dollars per share)					$ 4.87
Location, Statement of Income, Balance [Axis]: us-gaap:GeneralAndAdministrativeExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			965,329	914,574	$ 1,931,598	1,873,805
Location, Statement of Income, Balance [Axis]: us-gaap:ResearchAndDevelopmentExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			662,580	610,369	1,332,985	1,343,405
Location, Statement of Income, Balance [Axis]: imrx:GeneralAndAdministrativeAndResearchAndDevelopmentExpense
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			21,000	78,000	$ 46,000	160,000
Vested Repriced Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	200,000
Unvested Repriced Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense	$ 400,000
Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting period (in years)					4 years
Stock-based compensation expense			1,627,909	$ 1,524,943	$ 3,264,583	$ 3,217,210
Compensation expense remaining to be recognized			$ 12,146,420		$ 12,146,420
Compensation expense recognized over a weighted-average period (in years)					2 years 8 months 23 days
2021 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)			816,942		816,942
Exercise price (in dollars per share)	$ 3.01
Outstanding options (in shares)	2,986,354
2021 Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)		2,590,000
Aggregate number of shares outstanding (as a percent)		4.00%
2021 Plan \| Maximum \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		15,350,000
2021 ESPP \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)		250,000	1,460,190		1,460,190
Aggregate number of shares outstanding (as a percent)		1.00%
Granted (in shares)					566,900
2021 ESPP \| Maximum \| Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		3,340,000
Inducement Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)			1,882,000		1,882,000
Inducement Award Plan \| Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares reserved for future issuance (in shares)							2,000,000		500,000