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Subsequent Events (Details) - Ipsen Collaboration - Collaboration Arrangement - Subsequent Event $ in Thousands | Jul. 30, 2021 USD ($) agreement
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Subsequent Event [Line Items] |
Number of collaboration programs | agreement | 2
Non-refundable upfront payment received for research agreement | $ 20,000
Pre-clinical milestone payment amount | 5,000
Development and regulatory milestone payment amount | 180,000
Commercial milestone payment amount | 762,000
Collaboration agreement, licensing fees incurred | 3,000
Option Exercise Period after the Selection |
Subsequent Event [Line Items] |
Collaboration option exercise fee | 10,000
Option Exercise Period that begins after the first Option Exercise Period |
Subsequent Event [Line Items] |
Collaboration option exercise fee | $ 25,000

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- Definition Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Collaboration Agreement, Licensing Fees Incurred + References No definition available. + Details
Name: | xcur_CollaborationAgreementLicensingFeesIncurred
Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Collaboration Agreement, Option, Exercise Fee + References No definition available. + Details
Name: | xcur_CollaborationAgreementOptionExerciseFee
Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Collaboration Agreement, Upfront Payment + References No definition available. + Details
Name: | xcur_CollaborationAgreementUpfrontPayment
Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Number of Collaboration Programs + References No definition available. + Details
Name: | xcur_NumberofCollaborationPrograms
Namespace Prefix: | xcur_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

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- Definition Revenue Recognition, Multiple-deliverable Arrangements, Collaboration Agreement, Pre-Clinical Milestone Payment + References No definition available. + Details
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Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revenue Recognition, Multiple-deliverable Arrangements, Commercial Milestone Payment + References No definition available. + Details
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Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Revenue Recognition, Multiple-deliverable Arrangements, Development And Regulatory Milestone Payment + References No definition available. + Details
Name: | xcur_RevenueRecognitionMultipleDeliverableArrangementsDevelopmentAndRegulatoryMilestonePayment
Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Details
Name: | xcur_ArrangementNameAxis=xcur_IpsenCollaborationMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_TypeOfArrangementAxis=us-gaap_CollaborativeArrangementMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_SubsequentEventTypeAxis=us-gaap_SubsequentEventMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | xcur_ExercisePeriodAxis=xcur_ExercisePeriodOneMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | xcur_ExercisePeriodAxis=xcur_ExercisePeriodTwoMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |