| Document and Entity Information | Nov. 24, 2021 |
| Cover [Abstract] | |
| Amendment Flag | false |
| Entity Central Index Key | 0001619954 |
| Current Fiscal Year End Date | --12-31 |
| Document Type | 8-K |
| Document Period End Date | Nov. 24, 2021 |
| Entity Registrant Name | INOVALON HOLDINGS, INC. |
| Entity Incorporation State Country Code | DE |
| Entity File Number | 001-36841 |
| Entity Tax Identification Number | 47-1830316 |
| Entity Address, Address Line One | 4321 Collington Road |
| Entity Address, City or Town | Bowie |
| Entity Address, State or Province | MD |
| Entity Address, Postal Zip Code | 20716 |
| City Area Code | (301) |
| Local Phone Number | 809-4000 |
| Written Communications | false |
| Soliciting Material | false |
| Pre Commencement Tender Offer | false |
| Pre Commencement Issuer Tender Offer | false |
| Security 12b Title | Class A Common Stock, par value $0.000005 |
| Trading Symbol | INOV |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | false |
