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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

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