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STOCKHOLDER'S EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2022
May 09, 2022
Mar. 28, 2022
May 01, 2019
Aug. 31, 2020
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Nov. 05, 2020
Jul. 25, 2019
Class of Stock [Line Items]                        
Share-based compensation expense           $ 10,437 $ 5,993 $ 24,582 $ 17,581      
Common stock, shares authorized (in shares) 2,100,000,000         2,100,000,000   2,100,000,000        
Class A Shares                        
Class of Stock [Line Items]                        
Common stock, shares authorized (in shares) 1,000,000,000         1,000,000,000   1,000,000,000   1,000,000,000    
Common stock, par value (in dollars per share) $ 0.001         $ 0.001   $ 0.001   $ 0.001    
Conversion of Special Warrants to Class A and Class B Shares (in shares)           85,141 [1] 60,698 96,516 [2] 47,197,139 [3]      
Class B Shares                        
Class of Stock [Line Items]                        
Common stock, shares authorized (in shares) 1,000,000,000         1,000,000,000   1,000,000,000   1,000,000,000    
Common stock, par value (in dollars per share) $ 0.001         $ 0.001   $ 0.001   $ 0.001    
Conversion of Class B Shares to Class A Shares (in shares)           9,218 1,130,851 207,438 6,718,576      
Conversion of Special Warrants to Class A and Class B Shares (in shares)                 22,337,312      
Preferred Stock                        
Class of Stock [Line Items]                        
Common stock, shares authorized (in shares) 100,000,000         100,000,000   100,000,000        
Common stock, par value (in dollars per share) $ 0.001         $ 0.001   $ 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%
FCC petitions for declaratory ruling, foreign owned percentage permitted                     100.00%  
Performance RSUs                        
Class of Stock [Line Items]                        
Share-based compensation expense             $ 400   $ 1,400      
Award vesting period (in months)         18 months              
Q1 2022 Performance RSUs                        
Class of Stock [Line Items]                        
Share-based compensation expense           $ 800   $ 1,500        
Award vesting period (in months)     50 months                  
Unrecognized compensation cost $ 11,000         11,000   11,000        
Unrecognized compensation cost, weighted average period (in years) 50 months                      
Q2 2022 Performance RSUs                        
Class of Stock [Line Items]                        
Share-based compensation expense           1,300   2,000        
Unrecognized compensation cost $ 13,400         13,400   13,400        
Unrecognized compensation cost, weighted average period (in years) 3 years 3 years                    
Awards Vesting Based On Service Conditions                        
Class of Stock [Line Items]                        
Unrecognized compensation cost $ 54,300         $ 54,300   $ 54,300        
Unrecognized compensation cost, weighted average period (in years)               3 years 4 months 24 days        
[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 2022 or 2021.
[3] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2021 or 2020.