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Revenue - Disclosure Of Changes In Trade Receivables Contract Assets And Contract Liabilities Explanatory (Detail) € in Thousands | 6 Months Ended
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Jun. 30, 2019 EUR (€)
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items] |
Trade receivables, beginning balance | € 2,690
Trade receivables, additions | 5,819
Trade receivables, deductions | (7,116)
Trade receivables, ending balance | 1,393
Contract assets, beginning balance | 236
Contract assets, additions | 114
Contract assets, deductions | (278)
Contract assets, ending balance | 72
Contract liabilities, beginning balance | 114,609
Contract liabilities, additions | 848
Contract liabilities, deductions | (8,583)
Contract liabilities, ending balance | 106,874
Deferred revenue [member] |
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items] |
Contract liabilities, beginning balance | 114,609
Contract liabilities, additions | 848
Contract liabilities, deductions | (8,583)
Contract liabilities, ending balance | 106,874
Trade receivables [member] |
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items] |
Trade receivables, beginning balance | 2,690
Trade receivables, additions | 5,819
Trade receivables, deductions | (7,116)
Trade receivables, ending balance | 1,393
Unbilled receivables [member] |
Disclosure of changes in trade receivables, contract assets and contract liabilities [line items] |
Contract assets, beginning balance | 236
Contract assets, additions | 114
Contract assets, deductions | (278)
Contract assets, ending balance | € 72

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- Definition The amount of an entity’s right to consideration in exchange for goods or services that the entity has transferred to a customer, when that right is conditioned on something other than the passage of time (for example, the entity’s future performance). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
Name: | ifrs-full_ContractAssets
Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The amount of an entity’s obligation to transfer goods or services to a customer for which the entity has received consideration (or the amount is due) from the customer. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 105 -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_105&doctype=Standard -URIDate 2018-03-16 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Name IFRS -Number 15 -IssueDate 2018-01-01 -Paragraph 116 -Subparagraph a -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IFRS&num=15&date=2018-03-01&anchor=para_116_a&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition The amount due from customers for goods and services sold. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Name IAS -Number 1 -IssueDate 2018-01-01 -Paragraph 78 -Subparagraph b -URI http://eifrs.ifrs.org/eifrs/XBRL?type=IAS&num=1&date=2018-03-01&anchor=para_78_b&doctype=Standard -URIDate 2018-03-16 + Details
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Namespace Prefix: | ifrs-full_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Additions in contract assets. + References No definition available. + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Additions in contract liabilities. + References No definition available. + Details
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Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Additions to trade receivables + References No definition available. + Details
Name: | mrus_AdditionsToTradeReceivables
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deductions in contract assets. + References No definition available. + Details
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Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Deductions in contract liabilities. + References No definition available. + Details
Name: | mrus_DeductionsInContractLiabilities
Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Definition Deductions in trade receivables. + References No definition available. + Details
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Namespace Prefix: | mrus_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Disclosure of changes in trade receivables, contract assets and contract liabilities [line items] + References No definition available. + Details
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- Details
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Namespace Prefix: |
Data Type: | na
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Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |