XML 63 R54.htm IDEA: XBRL DOCUMENT
v3.19.2

Total Operating Expenses - Breakdown of Other Research and Development Costs (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] |  |  |  |
Discovery and preclinical costs | € 2,055 | € 1,078 | € 4,175 | € 1,763
Clinical costs | 3,156 | 1,850 | 6,041 | 4,248
Other R&D costs | 1,268 | 1,416 | 2,428 | 2,300
Total other R&D costs | € 6,479 | € 4,344 | € 12,644 | € 8,311

X
- Definition Clinical costs. + References No definition available. + Details
Name: | mrus_ClinicalCosts
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 Discovery and pre-clinical costs. + References No definition available. + Details
Name: | mrus_DiscoveryAndPreclinicalCosts
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Other research and development expense other. + References No definition available. + Details
Name: | mrus_OtherResearchAndDevelopmentExpenseOther
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