CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Revenue
Total revenue	$ 242,433	$ 179,917	$ 159,218
Costs and expenses
Total costs and expenses	156,404	117,497	106,874
Selling, general and administrative expenses
Sales and marketing	19,655	6,176	5,951
Research and development	19,096	14,243	10,647
General and administrative	88,742	41,704	30,721
Selling, general and administrative expenses	127,493	62,123	47,319
Operating (loss) income	(41,464)	297	5,025
Other income (expenses)
Gain on redemption of public preferred stock	0	14,012	0
Non-operating (expense) income	(921)	(255)	201
Interest expense	(777)	(7,259)	(7,467)
(Loss) income before income taxes	(43,162)	6,795	(2,241)
Benefit from income taxes	28	46	104
Net (loss) income	(43,134)	6,841	(2,137)
Less: Net income attributable to non-controlling interest	0	(5,154)	(4,264)
Net (loss) income attributable to Telos Corporation	$ (43,134)	$ 1,687	$ (6,401)
Net (loss) earnings per share attributable to Telos Corporation, basic (in dollars per share)	$ (0.65)	$ 0.04	$ (0.17)
Net (loss) earnings per share attributable to Telos Corporation, diluted (in dollars per share)	$ (0.65)	$ 0.04	$ (0.17)
Weighted-average shares of common stock outstanding, basic (in shares)	66,374,000	41,642,000	37,729,000
Weighted-average shares of common stock outstanding, diluted (in shares)	66,374,000	42,877,000	37,729,000
Services
Revenue
Total revenue	$ 221,548	$ 161,180	$ 143,581
Costs and expenses
Total costs and expenses	143,357	106,969	98,772
Products
Revenue
Total revenue	20,885	18,737	15,637
Costs and expenses
Total costs and expenses	$ 13,047	$ 10,528	$ 8,102