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Equity-Based Compensation - Narrative (Details) - USD ($) |  |  |  | 1 Months Ended | 9 Months Ended |
--- | --- | --- | --- | --- | --- | ---
May 14, 2021 | Jan. 01, 2021 | Jan. 01, 2020 | May 31, 2021 | Sep. 30, 2017 | Sep. 30, 2021 | Sep. 30, 2020 | Dec. 31, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) |  |  |  |  |  | 4,427,586 |  |
Options outstanding (in shares) |  |  |  |  |  | 11,059,955 |  | 7,227,296
Compensation cost not yet recognized |  |  |  |  |  | $ 7,820,000 |  |
Compensation expense recognition period |  |  |  |  |  | 3 years |  |
Weighted-average grant date fair value (in dollars per share) |  |  |  |  |  | $ 1.30 | $ 1.33 |
Aggregate intrinsic value, stock options, exercised |  |  |  |  |  | $ 243,000 | $ 74,000 |
Chief Financial Officer |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Options granted in period (in shares) |  |  |  | 600,000 |  |  |  |
Options outstanding (in shares) |  |  |  |  |  | 600,000 |  |
Exicure, Inc. 2017 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of additional shares authorized, potential maximum additional shares (in shares) |  |  |  |  |  | 4,600,000 |  |
Number of additional shares authorized, percentage of common stock outstanding |  |  |  |  |  | 5.00% |  |
Number of shares available for grant (in shares) |  |  |  |  |  | 2,558,218 |  |
Options to purchase common stock | Exicure, Inc. 2017 Equity Incentive Plan |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Increase in number of shares available for grant (in shares) |  | 4,382,567 |  |  |  |  |  |
Employee Stock |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Increase in number of shares available for grant (in shares) |  | 258,207 | 262,954 |  |  |  |  |
Number of shares available for grant (in shares) |  |  |  |  |  | 1,100,791 |  |
Maximum ESPP contribution rate as a percentage of compensation |  |  |  |  | 15.00% |  |  |
Maximum number of shares per employee in purchase period (in shares) |  |  |  |  | 7,500 |  |  |
Maximum contribution amount |  |  |  |  | $ 25,000 |  |  |
ESPP purchase price as a percentage of market price |  |  |  |  | 85.00% |  |  |
Offering period duration |  |  |  |  | 6 months |  |  |
Issuance of common stock-ESPP (in shares) | 103,096 |  |  |  |  |  |  |
Number of additional shares allowable annually under the plan (in shares) |  |  |  |  | 300,000 |  |  |
Percentage of outstanding shares allowable as annual increase |  |  |  |  | 0.30% |  |  |
Restricted stock units |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |
Number of shares issued for each vested restricted stock unit (in shares) |  |  |  |  |  | 1 |  |
Vesting period |  |  |  |  |  | 4 years |  |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Gross number of share options (or share units) granted during the period. + References No definition available. + Details
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- Definition The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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