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Stockholders' Equity - Current Capitalization (Details)
Sep. 26, 2017
shares
Jul. 09, 2015
Sep. 30, 2017
vote_per_share
$ / shares
shares
Dec. 31, 2016
$ / shares
shares
Dec. 31, 2015
$ / shares
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares)     35,513,987 131,644  
Common stock, shares authorized (in shares)     200,000,000 30,782,380  
Common stock, par value (in dollars per share) | $ / shares     $ 0.0001 $ 0.0001 $ 0.0001
Common stock, shares issued (in shares)     35,513,987 131,644  
Common stock, voting rights for each share | vote_per_share     1    
Non-redeemable preferred stock, shares authorized (in shares)     10,000,000    
Non-redeemable preferred stock, par value (in dollars per share) | $ / shares     $ 0.0001    
Non-redeemable preferred stock, shares issued (in shares)     0    
Non-redeemable preferred stock, shares outstanding (in shares)     0    
Common Stock          
Class of Stock [Line Items]          
Conversion ratio   1      
Shares issued in conversion of stock (in shares) 26,666,627        
Exicure OpCo 2015 Equity Incentive Plan          
Class of Stock [Line Items]          
Number of options converted (in shares) 7,414,115        
Exicure, Inc. 2017 Equity Incentive Plan          
Class of Stock [Line Items]          
Conversion grants in the period (in shares) 3,680,997        
Common and Preferred Stock, Excluding Series C Preferred Stock Converted into Max-1 Common Stock          
Class of Stock [Line Items]          
Conversion ratio 0.49649        
Series C Preferred Stock Converted into Max-1 Common Stock          
Class of Stock [Line Items]          
Conversion ratio 0.7666652        
Investor | Pre-Merger Shareholders          
Class of Stock [Line Items]          
Common stock, shares outstanding (in shares) 2,080,000