Revision of Prior Year Interim Financial Statements - Schedule of Error Corrections and Prior Period Adjustments (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Mar. 31, 2022	Dec. 31, 2021	Mar. 31, 2021	Dec. 31, 2020
Condensed Consolidated Statement of Operations
Revenue	$ 55,791	$ 53,644	$ 105,951	$ 109,402
Costs and expenses	34,862	31,110	66,151	72,398
General and administrative	23,865	29,635	46,788	49,712
Selling, general and administrative expenses	33,095	40,005	66,700	67,969
Operating loss	(12,166)	(17,471)	(26,900)	(30,965)
Loss before income taxes	(12,235)	(17,631)	(27,147)	(32,375)
Net loss		(17,644)		(32,422)
Net loss attributable to Telos Corporation	$ (12,289)	$ (17,644)	$ (27,272)	$ (32,422)
Net loss per share attributable to Telos Corporation
Basic (in dollars per share)	$ (0.18)	$ (0.26)	$ (0.40)	$ (0.49)
Diluted (in dollars per share)	$ (0.18)	$ (0.26)	$ (0.40)	$ (0.49)
Condensed Consolidated Statement of Comprehensive Loss
Net loss	$ (12,289)	$ (17,644)	$ (27,272)	$ (32,422)
Comprehensive loss attributable to Telos Corporation	(12,300)	(17,639)	(27,254)	(32,449)
Condensed Consolidated Statement of Cash Flows
Net loss	(12,289)	(17,644)	(27,272)	(32,422)
Changes in other operating assets and liabilities				(8,723)
Cash used in operating activities			8,132	(3,354)
Distribution to Telos ID Class B member – non-controlling interest			0	(2,436)
Cash provided by financing activities			(6,199)	33,038
Condensed Consolidated Statement of Changes in Stockholders' Equity
Net loss	(12,289)	(17,644)	(27,272)	(32,422)
Total Stockholders' equity	174,312	165,785	174,312	165,785	$ 175,061	$ 180,254	$ 125,964	$ 127,104
Accumulated Deficit
Condensed Consolidated Statement of Operations
Net loss attributable to Telos Corporation	(12,289)	(17,644)	(27,272)	(32,422)
Condensed Consolidated Statement of Comprehensive Loss
Net loss	(12,289)	(17,644)	(27,272)	(32,422)
Condensed Consolidated Statement of Cash Flows
Net loss	(12,289)	(17,644)	(27,272)	(32,422)
Condensed Consolidated Statement of Changes in Stockholders' Equity
Net loss	(12,289)	(17,644)	(27,272)	(32,422)
Total Stockholders' equity	(214,249)	(176,265)	(214,249)	(176,265)	$ (201,960)	$ (186,977)	$ (158,621)	$ (143,843)
Previously Reported
Condensed Consolidated Statement of Operations
Revenue		52,559		108,317
General and administrative		28,743		48,708
Selling, general and administrative expenses		39,113		66,965
Operating loss		(18,556)		(32,050)
Loss before income taxes		(18,716)		(33,460)
Net loss		(18,729)		(33,507)
Net loss attributable to Telos Corporation		$ (18,729)		$ (33,507)
Net loss per share attributable to Telos Corporation
Basic (in dollars per share)		$ (0.28)		$ (0.51)
Diluted (in dollars per share)		$ (0.28)		$ (0.51)
Condensed Consolidated Statement of Comprehensive Loss
Net loss		$ (18,729)		$ (33,507)
Comprehensive loss attributable to Telos Corporation		(18,724)		(33,534)
Condensed Consolidated Statement of Cash Flows
Net loss		(18,729)		(33,507)
Changes in other operating assets and liabilities				(10,074)
Cash used in operating activities				(5,790)
Distribution to Telos ID Class B member – non-controlling interest				0
Cash provided by financing activities				35,474
Condensed Consolidated Statement of Changes in Stockholders' Equity
Net loss		(18,729)		(33,507)
Total Stockholders' equity		164,700		164,700
Previously Reported | Accumulated Deficit
Condensed Consolidated Statement of Changes in Stockholders' Equity
Total Stockholders' equity		(177,350)		(177,350)
Error Correction
Condensed Consolidated Statement of Operations
Revenue		1,085		1,085
General and administrative		892		1,004
Selling, general and administrative expenses		892		1,004
Operating loss		1,085		1,085
Loss before income taxes		1,085		1,085
Net loss		1,085		1,085
Net loss attributable to Telos Corporation		$ 1,085		$ 1,085
Net loss per share attributable to Telos Corporation
Basic (in dollars per share)		$ 0.02		$ 0.02
Diluted (in dollars per share)		$ 0.02		$ 0.02
Condensed Consolidated Statement of Comprehensive Loss
Net loss		$ 1,085		$ 1,085
Comprehensive loss attributable to Telos Corporation		1,085		1,085
Condensed Consolidated Statement of Cash Flows
Net loss		1,085		1,085
Changes in other operating assets and liabilities				1,351
Cash used in operating activities				2,436
Distribution to Telos ID Class B member – non-controlling interest				(2,436)
Cash provided by financing activities				(2,436)
Condensed Consolidated Statement of Changes in Stockholders' Equity
Net loss		1,085		1,085
Total Stockholders' equity		1,085		1,085
Error Correction | Accumulated Deficit
Condensed Consolidated Statement of Changes in Stockholders' Equity
Total Stockholders' equity		1,085		1,085
Services
Condensed Consolidated Statement of Operations
Revenue	50,270	49,003	98,378	101,061
Costs and expenses	31,436	28,609	61,167	68,099
Services | Previously Reported
Condensed Consolidated Statement of Operations
Revenue		47,618		99,676
Costs and expenses		29,501		69,103
Services | Error Correction
Condensed Consolidated Statement of Operations
Revenue		1,385		1,385
Costs and expenses		(892)		(1,004)
Products
Condensed Consolidated Statement of Operations
Revenue	5,521	4,641	7,573	8,341
Costs and expenses	$ 3,426	2,501	$ 4,984	4,299
Products | Previously Reported
Condensed Consolidated Statement of Operations
Revenue		4,941		8,641
Products | Error Correction
Condensed Consolidated Statement of Operations
Revenue		(300)		(300)
Products And Services
Condensed Consolidated Statement of Operations
Costs and expenses		31,110		72,398
Products And Services | Previously Reported
Condensed Consolidated Statement of Operations
Costs and expenses		32,002		73,402
Products And Services | Error Correction
Condensed Consolidated Statement of Operations
Costs and expenses		$ (892)		$ (1,004)