| Cover | Aug. 16, 2021 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Aug. 16, 2021 |
| Entity File Number | 001-38893 |
| Entity Registrant Name | Golden Nugget Online Gaming, Inc. |
| Entity Central Index Key | 0001768012 |
| Entity Tax Identification Number | 83-3593048 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 1510 West Loop South |
| Entity Address, City or Town | Houston |
| Entity Address, State or Province | TX |
| Entity Address, Postal Zip Code | 77027 |
| City Area Code | 713 |
| Local Phone Number | 850-1010 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Class A common stock, par value $0.0001 per share |
| Trading Symbol | GNOG |
| Security Exchange Name | NASDAQ |
| Entity Emerging Growth Company | true |
| Elected Not To Use the Extended Transition Period | false |
