| Cover Page Cover Page | Nov. 06, 2019 |
| Cover page. | |
| Document Type | 8-K |
| Document Period End Date | Nov. 6, 2019 |
| Entity Registrant Name | VONAGE HOLDINGS CORP |
| Entity Incorporation, State or Country Code | DE |
| Entity File Number | 001-32887 |
| 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 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Title of 12(b) Security | Common Stock, par value $0.001 |
| Trading Symbol | VG |
| Security Exchange Name | NYSE |
| Entity Central Index Key | 0001272830 |
| Amendment Flag | false |
