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Stockholders' Equity - Additional information related to Warrants (Details) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Dec. 31, 2020
Class of Warrant or Right [Line Items]
Outstanding Number of Warrants	1,226,183		2,011,313
Weighted Average Remaining Life, Exercisable	4 years 2 months 12 days
Exercisable Number of Warrants	1,226,183
Number of warrants exercised	877,014
Proceeds from exercise of warrants	$ 2,103,991	$ 376,421
Warrants at exercise price of $2.4696
Class of Warrant or Right [Line Items]
Exercise Price of Warrants Outstanding	$ 2.4696
Outstanding Number of Warrants	917,919
Weighted Average Remaining Life, Exercisable	3 years 8 months 12 days
Exercisable Number of Warrants	917,919
Warrants at exercise price of $2.7240
Class of Warrant or Right [Line Items]
Exercise Price of Warrants Outstanding	$ 2.7240
Outstanding Number of Warrants	216,380
Weighted Average Remaining Life, Exercisable	3 years 8 months 12 days
Exercisable Number of Warrants	216,380
Warrants at exercise price of $2.7600
Class of Warrant or Right [Line Items]
Exercise Price of Warrants Outstanding	$ 4.7600
Outstanding Number of Warrants	91,884
Weighted Average Remaining Life, Exercisable	9 years 10 months 24 days
Exercisable Number of Warrants	91,884

X

- Definition

Number of warrants or rights exercisable.

+ References

No definition available.

+ Details

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Namespace Prefix:	eyen_
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Balance Type:	na
Period Type:	instant

X

- Definition

Weighted average remaining life of warrants or rights exercisable, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

+ Details

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Namespace Prefix:	eyen_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Number of warrants or rights exercised during the period.

+ References

No definition available.

+ Details

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Namespace Prefix:	eyen_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section 50
-Paragraph 3
-URI http://asc.fasb.org/extlink&oid=109259400&loc=d3e21475-112644

+ Details

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Balance Type:	na
Period Type:	instant

X

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

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

X

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

X

- Definition

The cash inflow associated with the amount received from holders exercising their stock warrants.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585

+ Details

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Balance Type:	debit
Period Type:	duration

X

- Details

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X

- Details

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- Details

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