Document And Entity Information - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Feb. 04, 2022	Jun. 30, 2021
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2021
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-36324
Entity Registrant Name	VARONIS SYSTEMS, INC.
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	57-1222280
Entity Address, Address Line One	1250 Broadway, 29th Floor
Entity Address, City or Town	New York
Entity Address, State or Province	NY
Entity Address, Postal Zip Code	10001
City Area Code	877
Local Phone Number	292-8767
Title of 12(b) Security	Common Stock, par value $0.001 per share
Trading Symbol	VRNS
Security Exchange Name	NASDAQ
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Entity Shell Company	false
Entity Public Float			$ 6,080
Entity Common Stock, Shares Outstanding		107,514,424
Documents Incorporated by Reference	Portions of the Registrant’s Proxy Statement relating to the 2021 Annual Meeting of Stockholders are incorporated by reference into Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0001361113
Document Fiscal Year Focus	2021
Document Fiscal Period Focus	FY
Amendment Flag	false