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Income taxes - Schedule of deferred tax assets (liabilities) (Details) - CAD ($) | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Income taxes paid (refund) [abstract] |  |
Other investments | $ (168,092) | $ (1,334,000)
Capital losses carried forward | 168,092 | 1,334,000
Deferred tax liabilities not recognized | $ 0 | $ 0

X
- Definition Deferred tax (asset) / liability not recognized. + References No definition available. + Details
Name: | huge_DeferredTaxAssetLiabilityNotRecognized
Namespace Prefix: | huge_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Amount of other investments. + References No definition available. + Details
Name: | huge_DeferredTaxAssetsOtherInvestments
Namespace Prefix: | huge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Represents amount of capital losses carried forward. + References No definition available. + Details
Name: | huge_DeferredTaxLiabilitiesCapitalLossesCarriedForward
Namespace Prefix: | huge_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | ifrs-full_IncomeTaxesPaidRefundAbstract
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration