Name:	cenn_IncomeTaxExaminationStatuteOfLimitations
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Statute of limitations period related to income tax examinations in certain countries for transfer pricing issues, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cenn_IncomeTaxExaminationStatuteOfLimitationsTransferPricingIssues
Namespace Prefix:	cenn_
Data Type:	xbrli:durationItemType
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Statute of limitations period related to income tax examinations in certain countries under special circumstance in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cenn_IncomeTaxExaminationStatuteOfLimitationsUnderSpecialCircumstance
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Data Type:	xbrli:durationItemType
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Amount of underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

No definition available.

Name:	cenn_IncomeTaxExaminationStatuteOfLimitationsUnderpaymentOfTaxes
Namespace Prefix:	cenn_
Data Type:	xbrli:monetaryItemType
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Period of an investigation covers the assessment prior to the year of the assessment in which the investigation commences. in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cenn_PeriodOfPriorTaxAssessmentYearsFromInvestigation
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Data Type:	xbrli:durationItemType
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Period of an extended investigation, in case of fraud and willful evasion, the investigation is extended covers the assessment prior to the year of the assessment in which the investigation commences, . in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

No definition available.

Name:	cenn_PeriodOfPriorTaxAssessmentYearsFromInvestigationExtended
Namespace Prefix:	cenn_
Data Type:	xbrli:durationItemType
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- References

No definition available.

Name:	us-gaap_IncomeTaxExpenseBenefitContinuingOperationsAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
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Tax year that remains open to examination under enacted tax laws, in YYYY format.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (e)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319

Name:	us-gaap_OpenTaxYear
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Data Type:	dtr-types:gYearListItemType
Balance Type:	na
Period Type:	duration

Amount of unrecognized tax benefits.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
-Paragraph 10B
-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15A
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=SL6600010-109319

Name:	us-gaap_UnrecognizedTaxBenefits
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Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 15
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32718-109319