Share-based payments - Equity share option 2017 (Equity settled) (Details) - Equity share option 2017 (Equity settled)	12 Months Ended
Dec. 31, 2019 Options € / shares shares
Share-based payments
Number of options granted \| Options	805,308
Number of common shares per option granted \| shares	1
Exercise price of share options	€ 0.12
Lock-up period	180 days
Weighted average remaining contractual life of outstanding share options	10 years
Weighted average fair value of options outstanding	€ 12.46

The period subsequent to the completion of the initial public offering in which the options may not be exercised.

No definition available.

Name:	cntg_LockUpPeriodSubsequentToCompletionOfInitialPublicOffering
Namespace Prefix:	cntg_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of common shares per share options granted in a share-based payment arrangement.

+ References

No definition available.

+ Details

Name:	cntg_ShareBasedCompensationArrangementByShareBasedPaymentAwardNumberOfCommonSharesPerOptionGranted
Namespace Prefix:	cntg_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average fair value of share options outstanding.

+ References

No definition available.

+ Details

Name:	cntg_WeightedAverageFairValueOfShareOptionsOutstanding
Namespace Prefix:	cntg_
Data Type:	num:perShareItemType
Balance Type:	na
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_DisclosureOfTermsAndConditionsOfSharebasedPaymentArrangementLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of share options granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph b
-Clause ii
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_b_ii&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_NumberOfShareOptionsGrantedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average exercise price of share options granted in a share-based payment arrangement. [Refer: Weighted average [member]]

+ References

+ Details

Name:	ifrs-full_WeightedAverageExercisePriceOfShareOptionsGrantedInSharebasedPaymentArrangement2019
Namespace Prefix:	ifrs-full_
Data Type:	num:perShareItemType
Balance Type:	na
Period Type:	duration

- Definition

The weighted average remaining contractual life of outstanding share options. [Refer: Weighted average [member]]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2019-01-01
-Paragraph 45
-Subparagraph d
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2019-en-r&anchor=para_45_d&doctype=Standard
-URIDate 2019-03-27

+ Details

Name:	ifrs-full_WeightedAverageRemainingContractualLifeOfOutstandingShareOptions2019
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_TypesOfSharebasedPaymentArrangementsAxis=cntg_EquityShareOption2017EquitySettledMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: