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Other asset - Additional Information (Detail) $ in Thousands | May 29, 2018 USD ($)
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Due with one year |
Other asset [line items] |
Contractual obligations | $ 4,000
Serono Inc | 2013 Termination agreement |
Other asset [line items] |
Contractual obligations | 28,200
Performance obligation final settlement amount | 23,850
Serono Inc | 2013 Termination agreement | Due with one year |
Other asset [line items] |
Contractual obligations | 4,000
Serono Inc | 2013 Termination agreement | Due in next four to five years |
Other asset [line items] |
Contractual obligations | $ 24,200

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- Definition Contractual obligations. + References No definition available. + Details
Name: | thtx_ContractualObligations
Namespace Prefix: | thtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Disclosure Information About Other Assets [Line item]. + References No definition available. + Details
Name: | thtx_DisclosureInformationAboutOtherAssetsLineItems
Namespace Prefix: | thtx_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Performance obligation final settlement amount. + References No definition available. + Details
Name: | thtx_PerformanceObligationFinalSettlementAmount
Namespace Prefix: | thtx_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Details
Name: | ifrs-full_MaturityAxis=thtx_DueWithOneYearMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_CounterpartiesAxis=thtx_SeronoIncMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | thtx_TypeOfArrangementAxis=thtx_TwoThousandThirteenTerminationAgreementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | ifrs-full_MaturityAxis=thtx_DueInNextFourToFiveYearsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |