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Fair Value Measurement (Details 1) - Change in Level 3 fair value [Member] $ in Thousands	Mar. 31, 2018 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Warrant liability as of December 31, 2017	$ 858
New warrant liabilities
Decrease in fair value of warrant liability	197
Ending warrant liability as of March 31, 2018	$ 661

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: