CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (DEFICIT) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid–in Capital	Accumulated Other Comprehensive Income	Accumulated Deficit	Non-Controlling Interest	Class A Common Stock Common Stock	Class B Common Stock Common Stock
Beginning balance (in shares) at Dec. 31, 2018		0					45,143,000	4,038,000
Beginning balance at Dec. 31, 2018	$ (132,103)	$ 0	$ 4,310	$ 17	$ (139,129)	$ 2,621	$ 65	$ 13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(2,137)				(6,401)	4,264
Purchase of Telos ID membership interest						0
Foreign currency translation (loss) gain	(11)			(11)
Distributions	(2,371)					(2,371)
Ending balance (in shares) at Dec. 31, 2019		0					45,143,000	4,038,000
Ending balance at Dec. 31, 2019	(136,622)	$ 0	4,310	6	(145,530)	4,514	$ 65	$ 13
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	6,841				1,687	5,154
Issuance of common stock upon conversion of Class A and Class B common stock (in shares)		39,003,000					(45,143,000)	(4,038,000)
Issuance of common stock upon conversion of Class A and Class B common stock	0	$ 78					$ (65)	$ (13)
Issuance of common stock (in shares)		25,622,000
Issuance of common stock	292,022	$ 25	291,997
Purchase of Telos ID membership interest	(30,000)		(25,511)			(4,489)
Foreign currency translation (loss) gain	38			38
Stock-based compensation	4		4
Distributions	$ (5,179)					(5,179)
Ending balance (in shares) at Dec. 31, 2020	64,625,071	64,625,000					0	0
Ending balance at Dec. 31, 2020	$ 127,104	$ 103	270,800	44	(143,843)	0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(32,422)
Ending balance at Jun. 30, 2021	$ 165,785				(176,265)
Beginning balance (in shares) at Dec. 31, 2020	64,625,071	64,625,000					0	0
Beginning balance at Dec. 31, 2020	$ 127,104	$ 103	270,800	44	(143,843)	0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(37,644)
Ending balance at Sep. 30, 2021	$ 171,837		354,300		(182,572)
Beginning balance (in shares) at Dec. 31, 2020	64,625,071	64,625,000					0	0
Beginning balance at Dec. 31, 2020	$ 127,104	$ 103	270,800	44	(143,843)	0	$ 0	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(43,134)				(43,134)
Issuance of common stock (in shares)		2,050,000
Issuance of common stock	64,269	$ 2	64,267
Foreign currency translation (loss) gain	(71)			(71)
Stock-based compensation (in shares)		132,000
Stock-based compensation	60,231		60,231
Repurchase of outstanding warrants	(26,894)		(26,894)
Repurchase of common stock (in shares)		(40,000)
Repurchase of common stock	$ (1,251)		(1,251)
Ending balance (in shares) at Dec. 31, 2021	66,767,450	66,767,000					0	0
Ending balance at Dec. 31, 2021	$ 180,254	$ 105	367,153	$ (27)	(186,977)	$ 0	$ 0	$ 0
Beginning balance at Jun. 30, 2021	165,785				(176,265)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(5,222)
Ending balance at Sep. 30, 2021	$ 171,837		$ 354,300		$ (182,572)