v3.10.0.1
Document and Entity Information
6 Months Ended
Jun. 30, 2018
Document - Document and Entity Information [Abstract]  
Document Type F-1
Amendment Flag false
Document Period End Date Jun. 30, 2018
Trading Symbol MRUS
Entity Registrant Name Merus N.V.
Entity Central Index Key 0001651311
Entity Emerging Growth Company true
Entity Ex Transition Period false