XML 29 R1.htm IDEA: XBRL DOCUMENT v3.6.0.2
Document and Entity Information - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Mar. 03, 2017
Aug. 05, 2016
Document and Entity Information [Abstract]      
Entity Registrant Name Gemphire Therapeutics Inc.    
Entity Central Index Key 0001638287    
Document Type 10-K    
Document Period End Date Dec. 31, 2016    
Amendment Flag false    
Current Fiscal Year End Date --12-31    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Well-known Seasoned Issuer No    
Entity Filer Category Non-accelerated Filer    
Entity Public Float     $ 30.3
Entity Common Stock, Shares Outstanding   9,272,582  
Document Fiscal Year Focus 2016    
Document Fiscal Period Focus FY