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Retirement Plans - Additional Information (Detail) - USD ($)	6 Months Ended	12 Months Ended
	Dec. 31, 2018	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2016
Retirement Benefits [Abstract]
Maximum percentage of eligible compensation matched by employer	5.00%
Employer contributions to retirement plans	$ 216,000	$ 220,000	$ 193,000	$ 209,000

X

- Definition

Defined contribution plan contributions by employer.

+ References

No definition available.

+ Details

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Namespace Prefix:	eypt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_CompensationAndRetirementDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan.

+ References

No definition available.

+ Details

Name:	us-gaap_DefinedContributionPlanEmployerMatchingContributionPercent
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration