Summary of significant accounting policies (Details) - EUR (€) € in Thousands	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019
Initial application
Standard warranty period	1 year
Unfulfilled performance obligations	€ 6,800	€ 772
Recognition of performance obligations		€ 584
Minimum
Initial application
Operating period for 3D printer in Services segment	1 year 6 months
Payment term	30 days
Maximum
Initial application
Operating period for 3D printer in Services segment	2 years 6 months
Payment term	60 days
Less than one year
Initial application
Unfulfilled performance obligations	€ 2,794
Satisfy performance obligations (as a percent)	96.00%
Two years
Initial application
Unfulfilled performance obligations	€ 117
Satisfy performance obligations (as a percent)	4.00%

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 105
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_105&doctype=Standard
-URIDate 2020-01-01

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph a
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_a&doctype=Standard
-URIDate 2020-01-01

+ 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_DisclosureOfInitialApplicationOfStandardsOrInterpretationsLineItems
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The amount of revenue that was included in the contract liability balance at the beginning of the period. [Refer: Contract liabilities; Revenue from contracts with customers]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 15
-IssueDate 2020-01-01
-Paragraph 116
-Subparagraph b
-URI http://eifrs.ifrs.org/eifrs/xifrs-link?type=IFRS&num=15&code=ifrs-tx-2020-en-r&anchor=para_116_b&doctype=Standard
-URIDate 2020-01-01

+ Details

Name:	ifrs-full_RevenueThatWasIncludedInContractLiabilityBalanceAtBeginningOfPeriod
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

The period that a 3D printer is operated in the Services segment.

+ References

No definition available.

+ Details

Name:	vjet_AveragePeriodOf3dPrinterOperationInServicesSegment
Namespace Prefix:	vjet_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

The general terms of sale required payment period.

+ References

No definition available.

+ Details

Name:	vjet_PaymentTermPeriod
Namespace Prefix:	vjet_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Definition

Period when entity typically satisfies performance obligations as a percent.

+ References

No definition available.

+ Details

Name:	vjet_SatisfyPerformanceObligationPercent
Namespace Prefix:	vjet_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

The standard warranty agreement period on products sold.

+ References

No definition available.

+ Details

Name:	vjet_StandardProductWarrantyPeriod
Namespace Prefix:	vjet_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_BottomOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_RangeAxis=ifrs-full_TopOfRangeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_NotLaterThanOneYearMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	ifrs-full_MaturityAxis=ifrs-full_LaterThanOneYearAndNotLaterThanTwoYearsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: