Financial liabilities - Trade payables and other liabilities (Details) - EUR (€) € in Thousands	6 Months Ended	12 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Dec. 31, 2019
Disclosure of reconciliation of liabilities arising from financing activities
Trade payables	€ 8,828		€ 8,554
Government grants (deferred income)	10,959		11,289
Liability for Virtual Stock Option Program	2,766		2,769
Contract liabilities	3,800		3,748
Others	7,666		5,258
Trade payables and other liabilities	34,019		31,618
Non-current	9,575		9,941
Current	24,444		21,677
Grants received for investment in property, plant and equipment	390	€ 341
Personnel related liabilities for vacation and bonuses	2,907		2,264
Liabilities for wage and church tax	527		376
Follow-on public offering
Disclosure of reconciliation of liabilities arising from financing activities
Costs relating to offering	€ 725
IPO
Disclosure of reconciliation of liabilities arising from financing activities
Costs relating to offering			€ 565

Costs incurred but not paid related to anticipated initial public offering.

No definition available.

Name:	cntg_AccruedOfferingCosts
Namespace Prefix:	cntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The cash inflow from grants received for investment in property, plant and equipment, classified as investing activities.

+ References

No definition available.

+ Details

Name:	cntg_IfrsGrantsReceivedForInvestmentInPropertyPlantAndEquipmentClassifiedAsInvestingActivities
Namespace Prefix:	cntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

The amount of liabilities for wage and church tax.

+ References

No definition available.

+ Details

Name:	cntg_LiabilitiesForWageAndChurchTax
Namespace Prefix:	cntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of liabilities for Virtual Stock Option Program.

+ References

No definition available.

+ Details

Name:	cntg_LiabilityForVirtualStockOptionProgram
Namespace Prefix:	cntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of trade and other payables, classified as other.

+ References

No definition available.

+ Details

Name:	cntg_TradeAndOtherPayablesOther
Namespace Prefix:	cntg_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_105&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2019-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2019-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_ContractLiabilities
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Line items represent concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes of the table.

+ References

No definition available.

+ Details

Name:	ifrs-full_DisclosureOfReconciliationOfLiabilitiesArisingFromFinancingActivitiesLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of assistance by government in the form of transfers of resources to an entity in return for past or future compliance with certain conditions relating to the operating activities of the entity, recognised as deferred income. They exclude those forms of government assistance that cannot reasonably have a value placed upon them and transactions with government that cannot be distinguished from the normal trading transactions of the entity. [Refer: Government [member]]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_55&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_GovernmentGrants
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of non-current trade payables and non-current other payables. [Refer: Other non-current payables; Non-current trade payables]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 54
-Subparagraph k
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_54_k&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NoncurrentPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of accruals for employee benefits (other than termination benefits) that are expected to be settled wholly within twelve months after the end of the annual reporting period in which the employees render the related services. [Refer: Accruals classified as current]

+ References

+ Details

Name:	ifrs-full_ShorttermEmployeeBenefitsAccruals
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of current trade payables and current other payables. [Refer: Current trade payables; Other current payables]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The current amount of payment due to suppliers for goods and services used in entity's business. [Refer: Current liabilities; Trade payables]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_78&doctype=Standard
-URIDate 2019-03-27

Reference 2: http://www.xbrl.org/2003/role/exampleRef
-Name IAS
-Number 1
-IssueDate 2019-01-01
-Paragraph 70
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IAS&num=1&code=ifrs-tx-2019-en-r&anchor=para_70&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_TradeAndOtherCurrentPayablesToTradeSuppliers
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The amount of trade payables and other payables. [Refer: Trade payables; Other payables]

+ References

+ Details

Name:	ifrs-full_TradeAndOtherPayables
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Details

Name:	cntg_IfrsSubsidiarySaleOfStockAxis=cntg_FollowOnPublicOfferingMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	cntg_IfrsSubsidiarySaleOfStockAxis=cntg_IfrsIPOMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: