FINANCIAL INSTRUMENTS AND RISK - Narrative (Details) - Jun. 30, 2025	CAD ($)	USD ($)
FINANCIAL INSTRUMENTS AND RISK
Cash, CDIC insured amount	$ 100,000
Cash, FDIC insured amount		$ 250,000
Working capital		$ 108,902,145

The amount of cash deposited in financial institutions as of the balance sheet date that is insured by the Canada Deposit Insurance Corporation.

No definition available.

Name:	epix_CashCanadaDepositInsuranceCorporationInsuredAmount
Namespace Prefix:	epix_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant