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Fair Value Measurement (Details 1) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2015 | Jun. 30, 2014
Fair Value Measurement [Abstract] |  |
Recorded warrant liability as of December 31, 2014 | $ 1,910 |
Warrants issued with convertible preferred stock (Note 10) | 75 |
Warrants issued with convertible promissory note (Note 5) | 167 |
Decrease in fair value of warrant liability | 812 |
Ending warrant liability as of June 30, 2015 | $ 1,340 |

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

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- Definition Warrants issued with convertible preferred stock. + References No definition available. + Details
Name: | crex_WarrantsIssuedWithConvertiblePreferredStock
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Warrants issued with convertible promissory note. + References No definition available. + Details
Name: | crex_WarrantsIssuedWithConvertiblePromissoryNote
Namespace Prefix: | crex_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Amount of expense (income) related to adjustment to fair value of warrant liability. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 480 -SubTopic 10 -Section 25 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6939902&loc=d3e20148-110875 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_FairValueDisclosuresAbstract
Namespace Prefix: | us-gaap_
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Balance Type: | na
Period Type: | duration