Document and Entity Information - USD ($) $ in Millions |
12 Months Ended | |
|---|---|---|
Dec. 31, 2015 |
Feb. 29, 2016 |
|
| Document And Entity Information [Abstract] | ||
| Document Type | 10-K | |
| Amendment Flag | false | |
| Document Period End Date | Dec. 31, 2015 | |
| Document Fiscal Year Focus | 2015 | |
| Document Fiscal Period Focus | FY | |
| Trading Symbol | EVOK | |
| Entity Registrant Name | Evoke Pharma Inc | |
| Entity Central Index Key | 0001403708 | |
| Current Fiscal Year End Date | --12-31 | |
| Entity Well-known Seasoned Issuer | No | |
| Entity Current Reporting Status | Yes | |
| Entity Voluntary Filers | No | |
| Entity Filer Category | Smaller Reporting Company | |
| Entity Common Stock, Shares Outstanding | 7,201,774 | |
| Entity Public Float | $ 14.0 |