Name:	cenn_MaterialRelatedPartyTransactionsAbstract
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The amount of reclassification of loan payable from due to a related party to other current liabilities.

No definition available.

Name:	cenn_ReclassificationOfLoanPayableFromDueToRelatedPartyToOtherCurrentLiabilities
Namespace Prefix:	cenn_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

Amount of interest expense incurred on a debt or other obligation to related party.

No definition available.

Name:	us-gaap_InterestExpenseRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Amount of interest income earned from interest-bearing assets owed to the entity by related party.

No definition available.

Name:	us-gaap_InterestIncomeRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
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Purchases during the period (excluding transactions that are eliminated in consolidated or combined financial statements) with related party.

No definition available.

Name:	us-gaap_RelatedPartyTransactionPurchasesFromRelatedParty
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_ZhejiangRAPMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_DevirraCorporationLimitedAndItsSubsidiariesCollectivelyReferredToTheDevirraGroupMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_ZhejiangZhongchaiMachineryCoLtdZhejiangZhongchaiMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_JiangsuRongyuanMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_HangzhouHezheEnergyTechnologyCoLtdMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_ShanghaiHengyuEnterpriseManagementConsultingCoLtdShanghaiHengyuMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_MrYeungHeungYeungMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_MrZhongWeiMember
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Name:	us-gaap_RelatedPartyTransactionsByRelatedPartyAxis=cenn_OthersRelatedPartiesMember
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