Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Mar. 03, 2025	Jun. 30, 2024
Cover [Abstract]
Document Type	10-K
Document Annual Report	true
Document Period End Date	Dec. 31, 2024
Current Fiscal Year End Date	--12-31
Document Transition Report	false
Entity File Number	001-08443
Entity Registrant Name	TELOS CORPORATION
Entity Incorporation, State or Country Code	MD
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
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Interactive Data Current	Yes
Entity Filer Category	Accelerated Filer
Entity Small Business	true
Entity Emerging Growth Company	false
ICFR Auditor Attestation Flag	true
Document Financial Statement Error Correction [Flag]	false
Entity Shell Company	false
Entity Public Float			$ 212.6
Entity Common Stock, Shares Outstanding		72,552,120
Documents Incorporated by Reference	Portions of the registrant's definitive Proxy Statement for the 2025 Annual Meeting of Stockholders to be filed with the Securities and Exchange Commission within 120 days after the end of the registrant's fiscal year ended December 31, 2024 are incorporated by reference in Part III of this Annual Report on Form 10-K.
Entity Central Index Key	0000320121
Amendment Flag	false
Document Fiscal Year Focus	2024
Document Fiscal Period Focus	FY