XML 61 R52.htm IDEA: XBRL DOCUMENT
v3.19.2

Total Operating Expenses - Summary of Total Operating Expenses (Detail) - EUR (€) € in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Disclosure Of Operating Expenses [abstract] |  |  |  |
Manufacturing costs | € 450 | € 5,580 | € 2,325 | € 9,858
IP and license costs | 585 | 492 | 876 | 844
Personnel related R&D | 2,470 | 2,107 | 4,510 | 3,808
Other R&D costs | 6,479 | 4,344 | 12,644 | 8,311
Total R&D costs | 9,984 | 12,523 | 20,355 | 22,821
Management and administration costs | 3,119 | 2,639 | 5,055 | 5,491
Litigation costs | 59 | 552 | 123 | 849
Other operating expenses | 3,684 | 2,745 | 7,624 | 5,134
Total other expenses | 3,743 | 3,297 | 7,747 | 5,983
Total operating expenses | € 16,846 | € 18,459 | € 33,157 | € 34,295

X
- Definition The amount of expense relating to general and administrative activities of the entity. + 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_GeneralAndAdministrativeExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of all operating expenses. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 85 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_85&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_OperatingExpense
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expenses that the entity does not separately disclose in the same statement or note when the entity uses the 'nature of expense' form for its analysis of expenses. [Refer: Expenses, by nature] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 102 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_102&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 99 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_99&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_OtherExpenseByNature
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 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 I p and license costs. + References No definition available. + Details
Name: | mrus_IPAndLicenseCosts
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Litigation costs. + References No definition available. + Details
Name: | mrus_LitigationCosts
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Manufacturing cost + References No definition available. + Details
Name: | mrus_ManufacturingCost
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other operating expenses. + References No definition available. + Details
Name: | mrus_OtherOperatingExpenses
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other research and development expenses + References No definition available. + Details
Name: | mrus_OtherResearchAndDevelopmentExpenses
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Personnel related research and development expense. + References No definition available. + Details
Name: | mrus_PersonnelRelatedResearchAndDevelopmentExpense
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration