Cover Page - USD ($)	12 Months Ended
	Dec. 31, 2019	Jan. 31, 2020	Jun. 30, 2019
Cover page.
Document Type	10-K
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2019
Entity File Number	001-32887
Entity Registrant Name	VONAGE HOLDINGS CORP
Entity Incorporation, State or Country Code	DE
Entity Tax Identification Number	11-3547680
Entity Address, Address Line One	23 Main Street
Entity Address, City or Town	Holmdel
Entity Address, State or Province	NJ
Entity Address, Postal Zip Code	07733
City Area Code	732
Local Phone Number	528-2600
Title of 12(b) Security	Common Stock, Par Value $0.001 Per Share
Trading Symbol	VG
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
Entity Shell Company	false
Entity Public Float			$ 2,588,190,451
Entity Common Stock, Shares Outstanding (in shares)		242,918,708
Entity Central Index Key	0001272830
Current Fiscal Year End Date	--12-31
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	FY
Amendment Flag	false