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Other asset - Additional Information (Detail) $ in Thousands	May 29, 2018 USD ($)
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

X

- Definition

Contractual obligations.

+ References

No definition available.

+ Details

Name:	thtx_ContractualObligations
Namespace Prefix:	thtx_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- 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: