Revision of Interim Financial Statements - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended			6 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative	$ 19,739	$ 29,635	$ 20,076	$ 49,712	$ 69,452	$ 88,742	$ 41,704	$ 30,721
Total revenue	68,981	53,644		109,402	178,383	242,433	179,917	159,218
Selling, general and administrative expenses	29,965	40,005	27,963	67,969	97,935	127,493	62,123	47,319
Distributions to Telos ID Class B member - non-controlling interest			2,436	2,436	2,436	2,436	2,743	2,371
Goodwill	17,922				17,922	17,922	14,916
Products
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	6,026	4,641		8,341	14,367	20,885	18,737	15,637
Services
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	62,955	49,003		101,061	164,016	$ 221,548	$ 161,180	$ 143,581
Error Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative	(823)	892	112	1,004	181
Total revenue	(1,085)	1,085		1,085	0
Selling, general and administrative expenses	(1,356)	892	112	1,004	(352)
Distributions to Telos ID Class B member - non-controlling interest			2,436	2,436	2,436
Goodwill	1,280				1,280
Error Correction | Products
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	(350)	(300)		(300)	(650)
Error Correction | Services
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	(735)	1,385		1,385	$ 650
Error Correction | Single Individual Stock Compensation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative		(200)	$ (100)	$ (300)
Selling, general and administrative expenses	200
Error Correction | Overhead Cost Pools Stock Compensation
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative		(700)
Error Correction | Expense Related to a Contract
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	900
Error Correction | Expense Related to Software Project
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses	500
Error Correction | Revenue Related to Stub Period of a Contract | Products
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	(400)	(300)
Error Correction | Revenue Related to Stub Period of a Contract | Services
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 400	$ 300