| Cover | Mar. 15, 2024 |
| Cover [Abstract] | |
| Document Type | 8-K |
| Document Period End Date | Mar. 15, 2024 |
| Entity Registrant Name | TELOS CORPORATION |
| Entity Incorporation, State or Country Code | MD |
| Entity File Number | 001-08443 |
| Entity Tax Identification Number | 52-0880974 |
| Entity Address, Address Line One | 19886 Ashburn Road |
| Entity Address, City or Town | Ashburn |
| Entity Address, State or Province | VA |
| Entity Address, Postal Zip Code | 20147-2358 |
| City Area Code | 703 |
| Local Phone Number | 724-3800 |
| Title of 12(b) Security | Common stock, $0.001 par value per share |
| Trading Symbol | TLS |
| Security Exchange Name | NASDAQ |
| Written Communications | false |
| Soliciting Material | false |
| Pre-commencement Tender Offer | false |
| Pre-commencement Issuer Tender Offer | false |
| Entity Emerging Growth Company | false |
| Entity Central Index Key | 0000320121 |
| Amendment Flag | false |
