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Fair Value Measurements - Additional Information (Details) $ in Thousands	Sep. 30, 2023 USD ($)
Fair Value Disclosures [Abstract]
Fair value assets transfer from Level 1 to Level 2	$ 0
Fair value assets transfer from Level 2 to Level 1	0
Fair value liabilities transfer from Level 1 to Level 2	0
Fair value liabilities transfer from Level 2 to Level 1	$ 0

X

- Definition

Fair value asset level1 to level2 transfer amount.

+ References

No definition available.

+ Details

Name:	tngx_FairValueAssetLevel1ToLevel2TransferAmount
Namespace Prefix:	tngx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value asset level2 to level1 transfer amount.

+ References

No definition available.

+ Details

Name:	tngx_FairValueAssetLevel2ToLevel1TransferAmount
Namespace Prefix:	tngx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value liabilities level1 to level2 transfer amounts.

+ References

No definition available.

+ Details

Name:	tngx_FairValueLiabilitiesLevel1ToLevel2TransferAmounts
Namespace Prefix:	tngx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Fair value liabilities level2 to level1 transfer amounts.

+ References

No definition available.

+ Details

Name:	tngx_FairValueLiabilitiesLevel2ToLevel1TransferAmounts
Namespace Prefix:	tngx_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- References

No definition available.

+ Details

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