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Equity-Based Compensation - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 6 Months Ended
Jan. 01, 2024
Jan. 01, 2020
Sep. 30, 2017
Jun. 30, 2024
Jun. 30, 2023
Sep. 22, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Compensation cost not yet recognized       $ 21    
Compensation expense recognition period       1 year 4 months 24 days    
Granted (in shares)       0    
Weighted-average grant date fair value (in dollars per share)         $ 1.26  
Employee Stock            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares)       61,971    
Maximum ESPP contribution rate as a percentage of compensation (as a percent)     15.00%      
Maximum number of shares per employee in purchase period (in shares)     250      
Maximum contribution amount     $ 25      
ESPP purchase price as a percentage of market price (as a percent)     85.00%      
Number of additional shares allowable annually under the plan (in shares)     10,000      
Percentage of outstanding shares allowable as annual increase (as a percent)     0.30%      
Increase in number of shares available for grant (in shares) 10,000          
Restricted stock units            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting period       4 years    
Number of shares issued for each vested restricted stock unit (in shares)       1    
Exicure, Inc. 2017 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares authorized (in shares)           194,750
Number of shares available for grant (in shares)       455,292   72,330
Number of additional shares authorized, potential maximum additional shares (in shares)   153,333        
Number of additional shares authorized, percentage of common stock outstanding (as a percent)   5.00%        
Exicure, Inc. 2017 Equity Incentive Plan | Share-based Payment Arrangement, Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares) 153,333          
Expiration period       10 years    
Exicure, Inc. 2017 Equity Incentive Plan | Initial Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting percentage (as a percent)       2.08%    
Vesting period       48 months    
Exicure, Inc. 2017 Equity Incentive Plan | Initial Employee Stock Option | Non-employee Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting percentage (as a percent)       2.78%    
Vesting period       36 months    
Exicure, Inc. 2017 Equity Incentive Plan | Initial Employee Stock Option | Period One            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Vesting percentage (as a percent)       25.00%    
Exicure, Inc. 2017 Equity Incentive Plan | Subsequent Employee Stock Option            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting percentage (as a percent)       2.08%    
Vesting period       48 months    
Exicure, Inc. 2017 Equity Incentive Plan | Subsequent Employee Stock Option | Non-employee Director            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Monthly vesting percentage (as a percent)       8.33%    
Vesting period       12 months    
Exicure OpCo 2015 Equity Incentive Plan            
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]            
Number of shares available for grant (in shares)           122,793