REVISION OF PRIOR YEAR INTERIM FINANCIAL STATEMENTS - Narrative (Details) $ in Thousands	3 Months Ended				6 Months Ended	9 Months Ended
	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Jun. 30, 2021 USD ($) costPool	Mar. 31, 2021 USD ($)	Jun. 30, 2021 USD ($)	Sep. 30, 2022 USD ($)	Sep. 30, 2021 USD ($)	Dec. 31, 2021 USD ($)
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative	$ 21,591	$ 19,739				$ 68,379	$ 69,452
Number of companies overhead cost pools incorrectly charged | costPool			2
Total revenue	63,593	68,981				169,544	178,383
Selling, general and administrative expenses	28,614	29,965				95,314	97,935
Distributions to Telos ID Class B member - non-controlling interest						0	2,436
Goodwill	17,922					17,922		$ 17,922
Service [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	55,305	62,955				153,683	164,016
Product [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue	$ 8,288	6,026				$ 15,861	14,367
Error Correction
Error Corrections and Prior Period Adjustments Restatement [Line Items]
General and administrative		(823)					181
Total revenue		(1,085)					0
Selling, general and administrative expenses		(1,356)					(352)
Distributions to Telos ID Class B member - non-controlling interest							2,436
Goodwill		1,300					1,300
Error Correction | Service [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		(735)					650
Error Correction | Product [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		(350)					$ (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 | Revenue Related To Stub Period Of A Contract | Service [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		400	300
Error Correction | Revenue Related To Stub Period Of A Contract | Product [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Total revenue		(400)	$ (300)
Error Correction | Expense Related To A Software Project
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses		500
Error Correction | Expense Related To A Contract
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Selling, general and administrative expenses		$ 900