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Supplemental Balance Sheet Information - Other noncurrent liabilities (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Supplemental Balance Sheet Information [Abstract] |  |
Operating lease liability | $ 0 | $ 59
Other noncurrent liabilities | $ 0 | $ 59

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121603541&loc=SL77918627-209977 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Amount of liabilities classified as other, due after one year or the normal operating cycle, if longer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.24) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
Name: | us-gaap_OtherLiabilitiesNoncurrent
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Supplemental Balance Sheet Information [Abstract] + References No definition available. + Details
Name: | xcur_SupplementalBalanceSheetInformationAbstract
Namespace Prefix: | xcur_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration