CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets
Accounts receivable, reserve	$ 308	$ 720
Inventories, obsolescence reserve	$ 851	$ 860
Telos stockholders' equity (deficit)
Common stock, par value (in dollars per share)	$ 0.001
Common stock, shares authorized (in shares)	250,000,000
Common shares issued (in shares)	64,625,071
Common stock, shares outstanding (in shares)	64,625,071
Class A Common Stock [Member]
Telos stockholders' equity (deficit)
Common stock, par value (in dollars per share		$ 0
Common stock, shares authorized (in shares)		50,000,000
Common shares issued (in shares)		35,826,200
Common stock, shares outstanding (in shares)		35,826,200
Class B Common Stock [Member]
Telos stockholders' equity (deficit)
Common stock, par value (in dollars per share		$ 0
Common stock, shares authorized (in shares)		5,000,000
Common shares issued (in shares)		3,204,293
Common stock, shares outstanding (in shares)		3,204,293