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Fair Value Measurement (Details 1) - Change in Level 3 fair value [Member] $ in Thousands | Dec. 31, 2017 USD ($)
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
Warrant liability December 31, 2016 | $ 705
New warrant liabilities |
Increase in fair value of warrant liability | 153
Ending warrant liability as of December 31, 2017 | $ 858

X
- Definition Amount of increase decrease in fair value of warrants for the reporting period. + References No definition available. + Details
Name: | crex_Increasedecreaseinfairvaluewarrantliability
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition It represent new warrant liabilities. + References No definition available. + Details
Name: | crex_NewWarrantLabilities
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Warrant liabilities + References No definition available. + Details
Name: | crex_RevisiedWarrantsLiability
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Warrant liability. + References No definition available. + Details
Name: | crex_WarrantLiabilities
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_FairValueAssetsAndLiabilitiesMeasuredOnRecurringAndNonrecurringBasisLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_FairValueByFairValueHierarchyLevelAxis=us-gaap_FairValueInputsLevel3Member
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |