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Right-of-use assets - Disclosure of right of use asset (Detail) - USD ($) $ in Thousands | 12 Months Ended
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Nov. 30, 2023 | Nov. 30, 2022
Disclosure of right of use Asset [Abstract] |  |  |
Beginning balance |  | $ 1,595 | $ 2,111
Amortization |  | (352) | (429)
Effect of change in exchange rates |  |  | (87)
Termination |  | (799) |
New lease | [1] | 326 |
Ending balance |  | $ 770 | $ 1,595
[1] | On March 1, 2023, the Company signed a new lease in Ireland. Accordingly, the Company recorded a right-of-use asset and a lease liability of $326.

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- Definition The amount of additions to right-of-use assets. [Refer: Right-of-use assets] + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph h -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_h&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_AdditionsToRightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition The amount of assets that represent a lessee's right to use an underlying asset for the lease term that do not meet the definition of investment property. Underlying asset is an asset that is the subject of a lease, for which the right to use that asset has been provided by a lessor to a lessee. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 53 -Subparagraph j -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_53_j&doctype=Standard -URIDate 2023-03-23 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 16 -IssueDate 2023-01-01 -Paragraph 47 -Subparagraph a -URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=16&code=ifrs-tx-2023-en-r&anchor=para_47_a&doctype=Standard -URIDate 2023-03-23 + Details
Name: | ifrs-full_RightofuseAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amortization of Right of use asset. + References No definition available. + Details
Name: | thtx_AmortizationOfRightOfUseAsset
Namespace Prefix: | thtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Disclosure of right Of use Asset. + References No definition available. + Details
Name: | thtx_DisclosureOfRightOfUseAssetAbstract
Namespace Prefix: | thtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Increase Decrease Through Net Exchange Differences of Right to use Asset. + References No definition available. + Details
Name: | thtx_IncreaseDecreaseThroughNetExchangeDifferencesOfRightToUseAsset
Namespace Prefix: | thtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Termination of right-of-use assets. + References No definition available. + Details
Name: | thtx_TerminationOfRightOfUseAssets
Namespace Prefix: | thtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration