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Other Liabilities and Accruals - Summary of Short-term and Payable Within One Year (Detail) - EUR (€) € in Thousands	Jun. 30, 2019	Dec. 31, 2018
Disclosure of accruals and other payables [abstract]
Audit fees	€ 70	€ 167
Personnel-related	405	560
Accrued bonus	928	1,523
Accrued R&D costs	4,758	4,409
Lease liabilities	1,432
IP legal fees	258	212
Subsidy advances received	151	42
Other accruals	1,748	1,051
Total	€ 9,750	€ 7,964

X

- Definition

The amount of current accrued expenses and other current liabilities. [Refer: Accruals; Other current liabilities]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
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-URIDate 2018-03-16

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X

- Definition

The amount of current payments received for goods or services to be provided in the future. [Refer: Advances received]

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 55
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_55&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

The amount of current lease liabilities. [Refer: Lease liabilities]

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Note Effective 2019-01-01
-Name IFRS
-Number 16
-IssueDate 2018-01-01
-Paragraph 47
-Subparagraph b
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-URIDate 2018-03-16

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X

- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 78
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78&doctype=Standard
-URIDate 2018-03-16

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X

- Definition

accrued auditors fee.

+ References

No definition available.

+ Details

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Namespace Prefix:	mrus_
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X

- Definition

Accrued intellectual property legal fee.

+ References

No definition available.

+ Details

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X

- Definition

Accrued personnel.

+ References

No definition available.

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X

- Definition

Accrued research and development studies.

+ References

No definition available.

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X

- Definition

Disclosure of accruals and other payables.

+ References

No definition available.

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X

- Definition

Other accruals.

+ References

No definition available.

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