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Stockholders' Equity - Capitalization Prior to the Merger (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 9 Months Ended 12 Months Ended
Sep. 26, 2017
Jan. 11, 2016
USD ($)
$ / shares
shares
Jul. 09, 2015
shares
Feb. 06, 2015
USD ($)
$ / shares
shares
Jun. 13, 2014
USD ($)
$ / shares
shares
Jun. 27, 2013
USD ($)
$ / shares
shares
Dec. 12, 2011
USD ($)
$ / shares
shares
Oct. 31, 2015
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Class of Stock [Line Items]                        
Proceeds from preferred stock offering | $                 $ 0 $ 450 $ 450 $ 19,672
Liquidation preference, percent of aggregate cash contributions                 1.5   1.5  
Preferred Units                        
Class of Stock [Line Items]                        
Number of shares not converted (in shares)     46                  
Class A Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)             11,381,611          
Price per share (in dollars per share) | $ / shares             $ 2.22          
Number of shares converted (in shares)     11,381,611                  
Class B-1 Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)             2,451,571          
Number of shares converted (in shares)     2,451,571                  
Price per share in sale of stock (in dollars per share) | $ / shares             $ 2.22          
Proceeds received from sale of stock, gross | $             $ 5,432          
Accounts receivable as result of sale of stock | $             $ 500          
Number of shares related to sale of stock accounts receivable (in shares)             225,677          
Stock issuance costs | $             $ 61          
Proceeds from preferred stock offering | $             5,371          
Class B-2 Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)           1,403,995            
Number of shares converted (in shares)     1,403,995                  
Price per share in sale of stock (in dollars per share) | $ / shares           $ 2.62            
Proceeds received from sale of stock, gross | $           $ 3,676            
Stock issuance costs | $           35            
Proceeds from preferred stock offering | $           $ 3,641            
Class C Preferred Units                        
Class of Stock [Line Items]                        
Number of shares converted (in shares)     6,073,280                  
Shares issued in sale of stock (in shares)       1,541,168 4,532,112              
Price per share in sale of stock (in dollars per share) | $ / shares       $ 3.00 $ 3.00              
Proceeds received from sale of stock, gross | $       $ 4,624 $ 13,596              
Stock issuance costs | $       43 117              
Proceeds from preferred stock offering | $       $ 4,581 $ 13,479              
Series A Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     11,381,640                  
Series B-1 Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     2,451,560                  
Series B-2 Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     1,403,984                  
Series C Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     6,073,226                  
Shares issued in sale of stock (in shares)   149,999           5,016,134        
Price per share in sale of stock (in dollars per share) | $ / shares   $ 3.00           $ 3.00        
Proceeds received from sale of stock, gross | $   $ 450           $ 15,048        
Stock issuance costs | $   6           69        
Proceeds from preferred stock offering | $   $ 444           $ 14,979        
Subsidiary of Common Parent                        
Class of Stock [Line Items]                        
Capital contribution at net book value | $             135          
Subsidiary of Common Parent | Class A Preferred Units                        
Class of Stock [Line Items]                        
Issuance of common stock, net | $             $ 25,217          
Exicure OpCo Common and Preferred, Excluding Series C Preferred                        
Class of Stock [Line Items]                        
Conversion ratio 0.49649                      
Series C Preferred Stock Converted into Common Stock                        
Class of Stock [Line Items]                        
Conversion ratio 0.7666652                      
Conversion of Common Unit of AuraSense Therapeutics, LLC Into One Share of Common Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Conversion ratio     1                  
Conversion of Class A Unit of AuraSense Therapeutics, LLC Into One Share of Series A Preferred Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Conversion ratio     1                  
Conversion of Class B-1 Unit of AuraSense Therapeutics, LLC Into One Share of Series B-1 Preferred Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Conversion ratio     1                  
Conversion of Class B-2 Unit of AuraSense Therapeutics, LLC Into One Share of Series B-2 Preferred Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Conversion ratio     1                  
Conversion of Class C Unit of AuraSense Therapeutics, LLC Into One Share of Series C Preferred Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Conversion ratio     1                  
Conversion of Options to Purchase Common Units of AuraSense Therapeutics, LLC Into Options to Purchase Common Stock of Exicure OpCo                        
Class of Stock [Line Items]                        
Option conversion ratio     1                  
Scenario, Previously Reported | Preferred Units                        
Class of Stock [Line Items]                        
Number of shares not converted (in shares)     17                  
Scenario, Previously Reported | Class A Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)             22,924,210          
Price per share (in dollars per share) | $ / shares             $ 1.10          
Number of shares converted (in shares)     22,924,210                  
Scenario, Previously Reported | Class B-1 Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)             4,937,818          
Number of shares converted (in shares)     4,937,818                  
Price per share in sale of stock (in dollars per share) | $ / shares             $ 1.10          
Number of shares related to sale of stock accounts receivable (in shares)             454,545          
Scenario, Previously Reported | Class B-2 Preferred Units                        
Class of Stock [Line Items]                        
Issuance of stock, net (in shares)           2,827,848            
Number of shares converted (in shares)     2,827,848                  
Price per share in sale of stock (in dollars per share) | $ / shares           $ 1.30            
Scenario, Previously Reported | Class C Preferred Units                        
Class of Stock [Line Items]                        
Number of shares converted (in shares)     7,921,669                  
Shares issued in sale of stock (in shares)       2,010,219 5,911,450              
Price per share in sale of stock (in dollars per share) | $ / shares       $ 2.30 $ 2.30              
Scenario, Previously Reported | Series A Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     22,924,209                  
Scenario, Previously Reported | Series B-1 Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     4,937,813                  
Scenario, Previously Reported | Series B-2 Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     2,827,844                  
Scenario, Previously Reported | Series C Preferred Stock                        
Class of Stock [Line Items]                        
Shares issued in conversion of stock (in shares)     7,921,662                  
Shares issued in sale of stock (in shares)   195,651           6,542,783        
Price per share in sale of stock (in dollars per share) | $ / shares   $ 2.30           $ 2.30