CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Revenue
Revenue	$ 55,757	$ 38,980
Costs and expenses
Total costs and expenses	41,400	26,738
Selling, general and administrative expenses
Sales and marketing	3,826	1,592
Research and development	4,061	3,657
General and administrative	19,964	6,590
Selling, general and administrative expenses	27,851	11,839
Operating (loss) income	(13,494)	403
Other income (expense)
Other (expense) income	(1,054)	8
Interest expense	(196)	(2,017)
Loss before income taxes	(14,744)	(1,606)
(Provision for) benefit from income taxes (Note 7)	(34)	146
Net loss	(14,778)	(1,460)
Less: Net income attributable to non-controlling interest (Note 2)	0	(784)
Net loss attributable to Telos Corporation	$ (14,778)	$ (2,244)
Net loss per share attributable to Telos Corporation, basic (in dollars per share)	$ (0.23)	$ (0.06)
Net loss per share attributable to Telos Corporation, diluted (in dollars per share)	$ (0.23)	$ (0.06)
Weighted-average shares of common stock outstanding, basic (in shares)	64,625	38,073
Weighted-average shares of common stock outstanding, diluted (in shares)	64,625	38,073
Service [Member]
Revenue
Revenue	$ 52,058	$ 34,558
Costs and expenses
Total costs and expenses	39,602	24,865
Product [Member]
Revenue
Revenue	3,699	4,422
Costs and expenses
Total costs and expenses	$ 1,798	$ 1,873