Document and Entity Information
9 Months Ended
Sep. 30, 2018
Document And Entity Information [Abstract]  
Entity Registrant Name Arcturus Therapeutics Ltd.
Document Type 6-K
Trading Symbol ARCT
Current Fiscal Year End Date --12-31
Amendment Flag false
Entity Central Index Key 0001566049
Document Period End Date Sep. 30, 2018
Document Fiscal Year Focus 2018
Document Fiscal Period Focus Q3