Cover Page - shares	6 Months Ended
	Jun. 30, 2020	Aug. 03, 2020
Cover [Abstract]
Amendment Flag	false
Document Fiscal Year Focus	2020
Document Fiscal Period Focus	Q2
Entity Central Index Key	0001603756
Current Fiscal Year End Date	--12-31
Document Type	10-Q
Document Quarterly Report	true
Document Period End Date	Jun. 30, 2020
Document Transition Report	false
Entity File Number	001-38721
Entity Registrant Name	Axonics Modulation Technologies, Inc.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	45-4744083
Entity Address, Address Line One	26 Technology Drive
Entity Address, City or Town	Irvine,
Entity Address, State or Province	CA
Entity Address, Postal Zip Code	92618
City Area Code	(949)
Local Phone Number	396-6322
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition period	true
Entity Shell Company	false
Title of 12(b) Security	Common stock, par value $0.0001 per share
Trading Symbol	AXNX
Security Exchange Name	NASDAQ
Entity Common Stock, Shares Outstanding		39,523,037