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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 |  |

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- 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

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- 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_
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- Definition Number of warrants or rights exercised during the period. + References No definition available. + Details
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- 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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- 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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- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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- 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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