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Description of Business and Basis of Presentation (Details)
$ / shares in Units, $ in Thousands
1 Months Ended 2 Months Ended 9 Months Ended 12 Months Ended
Nov. 14, 2017
shares
Nov. 02, 2017
USD ($)
shares
Sep. 26, 2017
USD ($)
$ / shares
shares
Jan. 11, 2016
USD ($)
$ / shares
shares
Jul. 09, 2015
USD ($)
shares
Feb. 06, 2015
USD ($)
$ / 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
Nov. 14, 2017
USD ($)
shares
Sep. 30, 2017
USD ($)
shares
Sep. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
shares
Dec. 31, 2015
USD ($)
shares
Oct. 26, 2017
$ / shares
Conversion of Stock [Line Items]                                
Common stock, shares outstanding (in shares)                       35,513,987   131,644    
Property and equipment, gross | $                       $ 1,835   $ 1,120 $ 822  
Proceeds from preferred stock offering | $                       0 $ 450 450 19,672  
Accumulated deficit generated, since inception | $                       (50,378)   (41,441)    
Additional paid-in capital | $                       43,219   (17,578) (18,293)  
Exicure OpCo Common and Preferred, Excluding Series C Preferred                                
Conversion of Stock [Line Items]                                
Percent ownership after transaction     94.00%                          
Common Stock                                
Conversion of Stock [Line Items]                                
Conversion ratio         1                      
Shares issued in conversion of stock (in shares)     26,666,627                          
Class A Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares)                 11,381,611              
Class B-1 Preferred Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares)                 2,451,571              
Proceeds from preferred stock offering | $                 $ 5,371              
Price per share in sale of stock (in dollars per share) | $ / shares                 $ 2.22              
Proceeds received from sale of stock, gross | $                 $ 5,432              
Class B-2 Preferred Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares)               1,403,995                
Proceeds from preferred stock offering | $               $ 3,641                
Price per share in sale of stock (in dollars per share) | $ / shares               $ 2.62                
Proceeds received from sale of stock, gross | $               $ 3,676                
Class C Preferred Units                                
Conversion of Stock [Line Items]                                
Proceeds from preferred stock offering | $           $ 4,581 $ 13,479                  
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                  
Series C                                
Conversion of Stock [Line Items]                                
Shares issued in conversion of stock (in shares)         6,073,226                      
Proceeds from preferred stock offering | $       $ 444           $ 14,979            
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            
Subsidiary of Common Parent                                
Conversion of Stock [Line Items]                                
Unbilled revenue receivable | $                 143              
Accrued legal expenses | $                 317              
Capital contribution at net book value | $                 135              
Reclassification to additional paid in capital | $         $ 18,837                      
Scientific equipment                                
Conversion of Stock [Line Items]                                
Property and equipment, gross | $                       $ 1,586   $ 993 $ 627  
Scientific equipment | Subsidiary of Common Parent                                
Conversion of Stock [Line Items]                                
Property and equipment, gross | $                 $ 309              
Exicure OpCo 2015 Equity Incentive Plan                                
Conversion of Stock [Line Items]                                
Number of options converted (in shares)     7,414,115                          
Exicure, Inc. 2017 Equity Incentive Plan                                
Conversion 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                                
Conversion of Stock [Line Items]                                
Conversion ratio     0.49649                          
Series C Preferred Stock Converted into Max-1 Common Stock                                
Conversion 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                                
Conversion 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                                
Conversion 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                                
Conversion 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                                
Conversion 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                                
Conversion 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                                
Conversion of Stock [Line Items]                                
Option conversion ratio         1                      
Northwestern University | Class A Units                                
Conversion of Stock [Line Items]                                
Percent of units received                 1.00%              
Number of units received (in shares)                 113,816              
Northwestern University | Subsidiary of Common Parent | Class A Units                                
Conversion of Stock [Line Items]                                
Number of units received (in shares)                 229,242              
Pre-Merger Shareholders | Investor                                
Conversion of Stock [Line Items]                                
Common stock, shares outstanding (in shares)     2,080,000                          
Subsequent Event | Exicure OpCo Common and Preferred, Excluding Series C Preferred                                
Conversion of Stock [Line Items]                                
Percent ownership after transaction     94.00%                          
Subsequent Event | Common Stock                                
Conversion of Stock [Line Items]                                
Shares issued in conversion of stock (in shares)     26,666,627                          
Subsequent Event | Exicure OpCo 2015 Equity Incentive Plan                                
Conversion of Stock [Line Items]                                
Number of options converted (in shares)     7,419,740                          
Subsequent Event | Exicure, Inc. 2017 Equity Incentive Plan                                
Conversion of Stock [Line Items]                                
Conversion grants in the period (in shares)     3,680,997                          
Subsequent Event | Common and Preferred Stock, Excluding Series C Preferred Stock Converted into Max-1 Common Stock                                
Conversion of Stock [Line Items]                                
Conversion ratio     0.49649                          
Subsequent Event | Series C Preferred Stock Converted into Max-1 Common Stock                                
Conversion of Stock [Line Items]                                
Conversion ratio     0.7666652                          
Private Placement                                
Conversion of Stock [Line Items]                                
Shares issued in sale of stock (in shares)     6,767,360                          
Price per share in sale of stock (in dollars per share) | $ / shares     $ 3.00                          
Proceeds received from sale of stock, gross | $     $ 17,235                          
Private Placement | Subsequent Event                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares) 50,000                              
Shares issued in sale of stock (in shares)   3,736,836 6,767,360               10,504,196          
Price per share in sale of stock (in dollars per share) | $ / shares     $ 3.00                         $ 0.0001
Proceeds received from sale of stock, gross | $   $ 11,211 $ 20,302               $ 31,513          
Additional paid-in capital | $     $ 17,394                          
Scenario, Previously Reported                                
Conversion of Stock [Line Items]                                
Common stock, shares outstanding (in shares)                           265,158 166,875  
Scenario, Previously Reported | Class A Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares)                 22,924,210              
Scenario, Previously Reported | Class B-1 Preferred Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (in shares)                 4,937,818              
Price per share in sale of stock (in dollars per share) | $ / shares                 $ 1.10              
Scenario, Previously Reported | Class B-2 Preferred Units                                
Conversion of Stock [Line Items]                                
Issuance of stock, net (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                                
Conversion of Stock [Line Items]                                
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 C                                
Conversion 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