Stockholders' Equity - Summary of the Company's Warrants (Details)	3 Months Ended
Mar. 31, 2024 $ / shares shares
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	39,414,780
Number of Warrants Exercisable	33,642,722
Shares of Common Stock Underlying Warrants	39,414,780
Pre-Funded Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	7,711,565
Number of Warrants Exercisable	7,711,565
Shares of Common Stock Underlying Warrants	7,711,565
Exercise Price \| $ / shares	$ 0.0001
Initial Exercise Date	Feb. 13, 2024
Series A Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	11,029,411
Number of Warrants Exercisable	11,029,411
Shares of Common Stock Underlying Warrants	11,029,411
Exercise Price \| $ / shares	$ 0.68
Initial Exercise Date	Feb. 13, 2024
Expiration Date	Feb. 13, 2029
Series B Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	9,092,922
Number of Warrants Exercisable	9,092,922
Shares of Common Stock Underlying Warrants	9,092,922
Exercise Price \| $ / shares	$ 0.68
Initial Exercise Date	Feb. 13, 2024
Expiration Date	Nov. 13, 2024
Series C Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	11,029,411
Number of Warrants Exercisable	5,808,824
Shares of Common Stock Underlying Warrants	11,029,411
Exercise Price \| $ / shares	$ 0.68
Initial Exercise Date	Feb. 13, 2024
Expiration Date	November 13, 2024 or February 13, 2029
Representative Warrants [Member]
Class of Warrant or Right [Line Items]
Number of Warrants Outstanding	551,471
Shares of Common Stock Underlying Warrants	551,471
Exercise Price \| $ / shares	$ 1.1222
Initial Exercise Date	Aug. 13, 2024
Expiration Date	Feb. 13, 2029

Class of warrant or right exercisable.

No definition available.

Name:	evok_ClassOfWarrantOrRightExercisable
Namespace Prefix:	evok_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Warrants and rights outstanding, maturity date description.

+ References

No definition available.

+ Details

Name:	evok_WarrantsAndRightsOutstandingMaturityDateDescription
Namespace Prefix:	evok_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Date the warrants or rights are exercisable, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 505
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481112/505-10-50-3

+ Details

Name:	us-gaap_ClassOfWarrantOrRighstDateFromWhichWarrantsOrRightsExercisable
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	duration

- Definition

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

+ References

+ Details

Name:	us-gaap_ClassOfWarrantOrRightExercisePriceOfWarrantsOrRights1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:perShareItemType
Balance Type:	na
Period Type:	instant

- 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

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

- Definition

Number of securities into which the class of warrant or right may be converted. For example, but not limited to, 500,000 warrants may be converted into 1,000,000 shares.

+ References

+ Details

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

- Definition

Number of warrants or rights outstanding.

+ References

No definition available.

+ Details

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

- Definition

Expiration date of outstanding warrant and right embodying unconditional obligation requiring redemption by transferring asset at specified or determinable date or upon event certain to occur, in YYYY-MM-DD format.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

+ Details

Name:	us-gaap_WarrantsAndRightsOutstandingMaturityDate
Namespace Prefix:	us-gaap_
Data Type:	xbrli:dateItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=evok_PreFundedWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=evok_SeriesAWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=evok_SeriesBWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=evok_SeriesCWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_ClassOfWarrantOrRightAxis=evok_RepresentativeWarrantsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: