Equity-Based Compensation - Narrative (Details) - USD ($) $ / shares in Units, $ in Thousands		1 Months Ended	9 Months Ended
	Jan. 01, 2023	Sep. 30, 2017	Sep. 30, 2023	Sep. 22, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized			$ 586
Compensation expense recognition period			1 year 10 months 24 days
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)			51,971
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)			454,360	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