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v3.20.2

Commitment and Contingencies (Details) $ in Thousands | 6 Months Ended
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Jun. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract] |
Aggregate consideration paid to NU for agreement obligations | $ 8,229

X
- 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 Payments for License Agreements + References No definition available. + Details
Name: | xcur_PaymentsforLicenseAgreements
Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration