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General and Basis of Presentation - Public Offerings of Common Stock (Details) - USD ($)
$ / shares in Units, $ in Thousands
6 Months Ended
Apr. 19, 2021
Apr. 06, 2021
Nov. 23, 2020
Nov. 19, 2020
Jun. 30, 2021
Jun. 30, 2020
Subsidiary, Sale of Stock [Line Items]            
Payments for repurchase of common stock         $ 1,251 $ 0
Proceeds from issuance of common stock   $ 64,300     64,269 0
Payments for repurchase of warrants         $ 26,894 $ 0
Enlightenment Capital Solutions Fund, II L.P.            
Subsidiary, Sale of Stock [Line Items]            
Payments for repurchase of common stock $ 1,300          
Stock repurchased during period (in shares) 39,682          
Payments for repurchase of warrants $ 26,900          
Warrants repurchased during period (in shares) 900,970          
Exchangeable Redeemable Preferred Stock            
Subsidiary, Sale of Stock [Line Items]            
Conversion of preferred stock to common stock     $ 108,900 $ 108,900    
IPO            
Subsidiary, Sale of Stock [Line Items]            
Number of shares issued (in shares)       17,200,000    
Share price (in dollars per share)       $ 17.00    
Net proceeds from initial public offering       $ 272,800    
Repayments of debt       21,000    
IPO | Exchangeable Redeemable Preferred Stock            
Subsidiary, Sale of Stock [Line Items]            
Conversion of preferred stock to common stock       108,900    
IPO | Class B Common Stock | Telos ID            
Subsidiary, Sale of Stock [Line Items]            
Payments for repurchase of common stock       $ 30,000    
Secondary Public Offering            
Subsidiary, Sale of Stock [Line Items]            
Sale of stock, number of shares issued in transaction (in shares)   9,100,000        
Sale of stock, price per share (in dollars per share)   $ 33.00        
Sale of stock, number of shares issued by certain existing shareholders (in shares)   7,000,000.0        
Proceeds from issuance of common stock   $ 64,300