XML 76 R54.htm IDEA: XBRL DOCUMENT v3.10.0.1

Total Operating Expenses - Additional Information (Detail) € in Thousands	3 Months Ended			6 Months Ended
	Jun. 30, 2018 EUR (€)	Jun. 30, 2017 EUR (€)		Jun. 30, 2018 EUR (€)	Jun. 30, 2018 USD ($)	Jun. 30, 2017 EUR (€)
Disclosure Of Operating Expenses [abstract]
Research and development costs | €	€ 12,523	€ 8,420	[1]	€ 22,821		€ 15,427	[1]
Attorneys' fees					$ 8,332,453.46
Expert fees					465,390.34
Litigation expenses and costs					$ 1,717,100.69
Litigation and opposition | €	€ 600	€ 100		€ 800		€ 400
[1] See Note 3 for details regarding the restatement as a result of a change in accounting policy.

X

- Definition

The amount of fees paid or payable for professional services.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IAS
-Number 1
-IssueDate 2018-01-01
-Paragraph 112
-Subparagraph c
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_112_c&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ProfessionalFeesExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of expenditure directly attributable to research or development activities, recognised in profit or loss.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Name IAS
-Number 38
-IssueDate 2018-01-01
-Paragraph 126
-URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=38&date=2018-03-01&anchor=para_126&doctype=Standard
-URIDate 2018-03-16

+ Details

Name:	ifrs-full_ResearchAndDevelopmentExpense
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Attorneys fees.

+ References

No definition available.

+ Details

Name:	mrus_AttorneysFees
Namespace Prefix:	mrus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Disclosure Of Operating Expenses [abstract].

+ References

No definition available.

+ Details

Name:	mrus_DisclosureOfOperatingExpensesAbstract
Namespace Prefix:	mrus_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Litigation and opposition expenses.

+ References

No definition available.

+ Details

Name:	mrus_LitigationAndOppositionExpenses
Namespace Prefix:	mrus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Litigation expenses.

+ References

No definition available.

+ Details

Name:	mrus_LitigationExpenses
Namespace Prefix:	mrus_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration