v3.10.0.1
Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Dec. 11, 2018
Document Information [Abstract]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Sep. 30, 2018  
Document Fiscal Year Focus 2018  
Document Fiscal Period Focus Q3  
Trading Symbol AXNX  
Entity Registrant Name Axonics Modulation Technologies, Inc.  
Entity Central Index Key 0001603756  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Entity Emerging Growth Company true  
Entity Small Business true  
Entity Ex Transition period true  
Entity Common Stock, Shares Outstanding   27,805,103