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Research and development expenses (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Research and development expenses
Personnel expenses	$ 132,903	$ 99,482
External research and development expenses	286,038	233,868
Materials and consumables	2,309	2,044
Depreciation and amortization	2,769	3,498
IT expenses	16,493	13,441
Other expenses	9,743	9,031
Total research and development expenses	$ 450,255	$ 361,364

X

- Definition

Represents depreciation and amortization of assets used in research and development.

+ References

No definition available.

+ Details

Name:	argx_DepreciationAndAmortizationExpenseResearchAndDevelopment
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

N/A

+ References

No definition available.

+ Details

Name:	argx_DisclosureOfResearchAndDevelopmentExpenseAbstract
Namespace Prefix:	argx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

The expense of all forms of consideration given by an entity in exchange for a service rendered by employees or for the termination of employment classified as research and development expenses.

+ References

No definition available.

+ Details

Name:	argx_EmployeeBenefitExpensesClassifiedAsResearchAndDevelopmentExpenses
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expenditure directly attributable to external research or development activities, recognized in profit or loss.

+ References

No definition available.

+ Details

Name:	argx_ExternalResearchAndDevelopmentExpenses
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of cost related to the Internal technology.

+ References

No definition available.

+ Details

Name:	argx_InternalTechnologyExpenses
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents expenses incurred in research and development not separately disclosed.

+ References

No definition available.

+ Details

Name:	argx_OtherResearchAndDevelopmentExpenses
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Represents raw materials and consumables expenses incurred in the R&D process.

+ References

No definition available.

+ Details

Name:	argx_RawMaterialsAndConsumablesUsedInResearchAndDevelopment
Namespace Prefix:	argx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2023-01-01
-Paragraph 126
-URI https://taxonomy.ifrs.org/xifrs-link?type=IAS&num=38&code=ifrs-tx-2023-en-r&anchor=para_126&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration