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Intangible Assets and Goodwill (Details 2)	6 Months Ended
	Jun. 30, 2021 USD ($)
Intangible Assets and Goodwill
Goodwill, Beginning Balance	$ 272,000
Centric telecom business acquisition	1,123,000
NetSapiens business acquisition	26,734,000
Goodwill, Ending Balance	$ 28,129

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

No definition available.

+ Details

Name:	crex_BusinessAcquisition
Namespace Prefix:	crex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	crex_CentricTelecomBusinessAcquisition
Namespace Prefix:	crex_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

No definition available.

+ Details

Name:	crex_GoodwillEnding
Namespace Prefix:	crex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	crex_GoodwillEndingBalance
Namespace Prefix:	crex_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- References

No definition available.

+ Details

Name:	us-gaap_GoodwillAndIntangibleAssetsDisclosureAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration