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Equity-Based Compensation - Narrative (Details) $ / shares in Units, $ in Thousands				9 Months Ended		12 Months Ended
	Sep. 22, 2017 shares	Oct. 06, 2015	Oct. 03, 2014 USD ($) individual $ / shares	Sep. 30, 2017 USD ($) $ / shares	Sep. 30, 2016 USD ($) $ / shares	Dec. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($) $ / shares	Oct. 13, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Compensation cost not yet recognized | $			$ 90	$ 2,352		$ 1,630
Compensation expense recognition period				2 years 6 months		2 years 7 months 6 days
Estimated fair value of common stock, per share (in dollars per share) | $ / shares			$ 0.32	$ 3.00
Number of current employees and board members affected from modification | individual			20
Number of non-employees affected from modification | individual			7
Weighted-average grant date fair value (in dollars per share) | $ / shares				$ 2.92	$ 1.53	$ 0.90	$ 0.53
Modified strike price (in dollars per share) | $ / shares			$ 0.32
Incremental fair value of compensation cost from modification | $			$ 16
Intrinsic value of options exercised | $				$ 202	$ 48	$ 63	$ 36
Initial Employee Stock Option | Monthly
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights as a percentage, by month		2.08%
Subsequent Employee Stock Option | Monthly
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights as a percentage, by month		2.08%
Exicure, Inc. 2017 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)	5,842,525
Number of shares available for grant (in shares)	2,158,708
Number of additional shares authorized (in shares)	4,600,000
Number of additional shares authorized as a percentage of common stock outstanding (in shares)	5.00%
Exicure OpCo 2015 Equity Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized (in shares)								9,806,006
Number of shares available for grant (in shares)						3,318,400
Number of additional shares authorized as a percentage of common stock outstanding (in shares)								4.00%
Exicure OpCo 2015 Equity Incentive Plan | Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant (in shares)	3,683,817
Award expiration period		10 years
Exicure OpCo 2015 Equity Incentive Plan | Initial Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		48 months
Exicure OpCo 2015 Equity Incentive Plan | Initial Employee Stock Option | First 12-month anniversary
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting rights as a percentage, by month		25.00%
Exicure OpCo 2015 Equity Incentive Plan | Subsequent Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		48 months

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- Definition

Unrecognized cost of unvested share-based compensation awards.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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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.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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The number of employees affected by the modification of an equity-based compensation plan.

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