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STOCKHOLDER'S EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
Mar. 28, 2022
May 01, 2019
Aug. 31, 2020
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Dec. 22, 2021
Jul. 25, 2019
Class of Stock [Line Items]                
Share-based compensation expense       $ 5,535 $ 5,685      
Common stock, shares authorized (in shares)       2,100,000,000        
FCC petitions for declaratory ruling, percentage of voting stock and equity owned by non-US individuals and entities (up to)             100.00%  
Class A Shares                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)       1,000,000,000   1,000,000,000    
Common stock, par value (in dollars per share)       $ 0.001   $ 0.001    
Class B Shares                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)       1,000,000,000   1,000,000,000    
Common stock, par value (in dollars per share)       $ 0.001   $ 0.001    
Conversion of Class B Shares to Class A Shares (in shares)       (159,692) (154,045)      
Preferred Stock                
Class of Stock [Line Items]                
Common stock, shares authorized (in shares)       100,000,000        
Common stock, par value (in dollars per share)       $ 0.001        
Special Warrants                
Class of Stock [Line Items]                
Special warrants, number of securities called by each warrant (in shares)   1            
Special warrants, exercise price per share (in dollars per share)   $ 0.001            
Special warrants, conversion terms, ownership percentage of common stock (as a percent)   4.99%            
Special warrants, conversion terms, ownership percentage of capital stock or voting interests (as a percent)   22.50%            
FCC petitions for declaratory ruling, percentage of voting stock and equity owned by non-US individuals and entities (up to)               25.00%
Vesting based on service conditions                
Class of Stock [Line Items]                
Unrecognized compensation cost       $ 34,000        
Unrecognized compensation cost, weighted average period (in years)       1 year 10 months 24 days        
Vesting based on performance conditions                
Class of Stock [Line Items]                
Unrecognized compensation cost       $ 12,500        
Unrecognized compensation cost, weighted average period (in years)       50 months        
Restricted Stock Units (RSUs)                
Class of Stock [Line Items]                
Share-based compensation expense         $ 500      
Award vesting period (in months)     18 months          
2022 Performance RSUs                
Class of Stock [Line Items]                
Award vesting period (in months) 50 months              
Common Stock | Class A Shares                
Class of Stock [Line Items]                
Conversion of Class B Shares to Class A Shares (in shares)       (159,692) [1] (154,045) [2]      
Conversion of Special Warrants to Class A and Class B Shares (in shares)       11,361 [1] 47,121,747 [2]      
Common Stock | Class B Shares                
Class of Stock [Line Items]                
Conversion of Class B Shares to Class A Shares (in shares)       (159,692) [1] (154,045) [2]      
Conversion of Special Warrants to Class A and Class B Shares (in shares)       0 22,337,312 [2]      
Common Stock | Special Warrants                
Class of Stock [Line Items]                
Conversion of Special Warrants to Class A and Class B Shares (in shares)       11,361 [1] 69,459,059 [2]      
Corporate Expenses                
Class of Stock [Line Items]                
Share-based compensation expense       $ 5,500 $ 5,700      
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2022.
[2] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2021.