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Fair Value Measurements - Warrant Liability Activity (Details) $ / shares in Units, shares in Thousands, $ in Thousands | 6 Months Ended
--- | ---
Jun. 30, 2023 USD ($) $ / shares shares
Warrants Outstanding |
Beginning balance (in shares) | shares | 0
Option to exercise (in shares) | shares | 526
Payment to warrant holder (in shares) | shares | (526)
Ending balance (in shares) | shares | 0
Fair Value Per Share |
Beginning balance (in usd per share) | $ / shares | $ 0
Option to exercise (in usd per share) | $ / shares | 1.52
Payment to warrant holder (in usd per share) | $ / shares | 1.52
Ending balance (in usd per share) | $ / shares | $ 0
Warrants And Rights Outstanding [Roll Forward] |
Balance at December 31, 2022 | $ | $ 0
Option to exercise | $ | 800
Payment to warrant holder | $ | (800)
Balance at June 30, 2023 | $ | $ 0

X
- Definition Number of warrants or rights outstanding. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | instant

X
- Definition Value of outstanding derivative securities that permit the holder the right to purchase securities (usually equity) from the issuer at a specified price. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Class Of Warrant Or Right, Additions + References No definition available. + Details
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Namespace Prefix: | xcur_
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Balance Type: | na
Period Type: | duration

X
- Definition Class Of Warrant Or Right, Additions, Fair Value Per Share + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Outstanding, Fair Value Per Share + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Outstanding, Fair Value Per Share + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Outstanding + References No definition available. + Details
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- Definition Class Of Warrant Or Right, Payments + References No definition available. + Details
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Data Type: | xbrli:sharesItemType
Balance Type: | na
Period Type: | duration

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- Definition Class Of Warrant Or Right, Payments, Fair Value Per Share + References No definition available. + Details
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Namespace Prefix: | xcur_
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- Definition Warrants And Rights Outstanding, Additions + References No definition available. + Details
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Namespace Prefix: | xcur_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Warrants And Rights Outstanding, Payment + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Warrants And Rights Outstanding + References No definition available. + Details
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Namespace Prefix: | xcur_
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Balance Type: | na
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