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Summary of Significant Accounting Policies - Summary of Estimated Useful Lives of Property and Equipment (Details)	3 Months Ended
	Mar. 31, 2024
Computer Software [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful life	3 years
Computer Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful life	3 years
Furniture and Fixtures [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful life	5 years
Laboratory Equipment [Member]
Significant Accounting Policies [Line Items]
Property and equipment estimated useful life	5 years
Leasehold Improvements [Member]
Significant Accounting Policies [Line Items]
Property and equipment, estimated useful life	Shorter of remaining lease term or 10 years

X

- Definition

Property, plant and equipment, estimated useful life description.

+ References

No definition available.

+ Details

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Namespace Prefix:	tngx_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Significant accounting policies.

+ References

No definition available.

+ Details

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Namespace Prefix:	tngx_
Data Type:	xbrli:stringItemType
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X

- Definition

Useful life of long lived, physical assets used in the normal conduct of business and not intended for resale, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. Examples include, but not limited to, land, buildings, machinery and equipment, office equipment, furniture and fixtures, and computer equipment.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_FurnitureAndFixturesMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_LeaseholdImprovementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: