| Cover | Mar. 22, 2022 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Amendment Flag | false |
| Document Period End Date | Mar. 22, 2022 |
| Entity File Number | 001-15288 |
| Entity Registrant Name | Network-1 Technologies, Inc. |
| Entity Central Index Key | 0001065078 |
| Entity Tax Identification Number | 11-3027591 |
| Entity Incorporation, State or Country Code | DE |
| Entity Address, Address Line One | 65 Locust Avenue |
| Entity Address, City or Town | New Canaan |
| Entity Address, State or Province | CT |
| Entity Address, Postal Zip Code | 06840 |
| City Area Code | (203) |
| Local Phone Number | 920-1055 |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Title of 12(b) Security | Common Stock, par value $0.01 per share |
| Trading Symbol | NTIP |
| Security Exchange Name | NYSEAMER |
| Entity Emerging Growth Company | false |
