Document and Entity Information - USD ($)	12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017
Entity Information [Line Items]
Entity Registrant Name	TELOS CORP
Entity Central Index Key	0000320121
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Non-accelerated Filer
Entity Public Float		$ 0
Document Fiscal Year Focus	2017
Document Fiscal Period Focus	FY
Document Type	10-K
Amendment Flag	false
Document Period End Date	Dec. 31, 2017
Class A Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	45,213,461
Class B Common Stock [Member]
Entity Information [Line Items]
Entity Common Stock, Shares Outstanding	4,037,628