XML 68 R59.htm IDEA: XBRL DOCUMENT
v3.19.2

Finance Income (Expense) - Additional Information (Detail) € in Millions, $ in Millions | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2019 EUR (€) | Jun. 30, 2018 EUR (€) | Jun. 30, 2019 EUR (€) | Jun. 30, 2018 EUR (€) | Jun. 30, 2019 USD ($) | Jun. 30, 2018 USD ($)
Rental expenses on real estate [abstract] |  |  |  |  |  |
Foreign exchange gain (loss) | € | € (1.1) | € 6.9 | € 0.9 | € 4.1 |  |
Foreign currency denominated cash and cash equivalent accounts and investment | $ |  |  |  |  | $ 31.1 | $ 54.5

X
- Definition The amount of exchange differences recognised in profit or loss that arise from foreign currency transactions, excluding those arising on financial instruments measured at fair value through profit or loss in accordance with IFRS 9. [Refer: At fair value [member]; Financial instruments, class [member]] + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 7 -IssueDate 2018-01-01 -Section A Statement of cash flows for an entity other than a financial institution -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=7&date=2018-03-01&anchor=sect_AStatementofcashflowsforanentityotherthanafinancialinstitution&doctype=Illustrative%20Examples -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IAS -Number 21 -IssueDate 2018-01-01 -Paragraph 52 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=21&date=2018-03-01&anchor=para_52_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_GainsLossesOnExchangeDifferencesOnTranslationRecognisedInProfitOrLoss
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

X
- Definition Cash and cash equivalent accounts and investment in foreign currency. + References No definition available. + Details
Name: | mrus_CashAndCashEquivalentAccountsAndInvestmentInForeignCurrency
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Rental expenses on real estate. + References No definition available. + Details
Name: | mrus_RentalExpensesOnRealEstateAbstract
Namespace Prefix: | mrus_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration