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STOCKHOLDER'S EQUITY - Narrative (Details) - USD ($)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended 9 Months Ended
May 01, 2019
Aug. 31, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Class of Stock [Line Items]              
Share-based compensation expense     $ 5,993 $ 5,885 $ 17,581 $ 14,728  
Unrecognized compensation cost, weighted average period (in years)         2 years 3 months 18 days    
Common stock, shares authorized (in shares)     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
Common stock, par value (in dollars per share)     $ 0.001   $ 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   1,000,000,000
Common stock, par value (in dollars per share)     $ 0.001   $ 0.001   $ 0.001
Conversion of Class B Shares to Class A Shares (in shares)     (1,130,851) (7,263) (6,718,576) (13,323)  
Preferred Stock              
Class of Stock [Line Items]              
Common stock, shares authorized (in shares)     100,000,000   100,000,000    
Common stock, par value (in dollars per share)     $ 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%            
Vesting based on service conditions              
Class of Stock [Line Items]              
Unrecognized compensation cost     $ 45,000   $ 45,000    
Vesting based on performance conditions              
Class of Stock [Line Items]              
Unrecognized compensation cost     300   300    
Restricted Stock Units (RSUs)              
Class of Stock [Line Items]              
Share-based compensation expense     $ 400 $ 1,100 $ 1,400 $ 1,100  
Award vesting period (in months)   18 months          
Common Shares | Class A Shares              
Class of Stock [Line Items]              
Conversion of Class B Shares to Class A Shares (in shares)     (1,130,851) [1] (7,263) [2] (6,718,576) [3] (13,323) [4]  
Conversion of Special Warrants to Class A and Class B Shares (in shares)     60,698 [1] 1,986,278 [2] 47,197,139 [3] 4,990,132 [4]  
Common Shares | Class B Shares              
Class of Stock [Line Items]              
Conversion of Class B Shares to Class A Shares (in shares)     (1,130,851) [1] (7,263) [2] (6,718,576) [3] (13,323) [4]  
Conversion of Special Warrants to Class A and Class B Shares (in shares)     0 704 [2] 22,337,312 [3] 2,049 [4]  
Common Shares | Special Warrants              
Class of Stock [Line Items]              
Conversion of Special Warrants to Class A and Class B Shares (in shares)     60,698 [1] 1,986,982 [2] 69,534,451 [3] 4,992,181 [4]  
Corporate Expenses              
Class of Stock [Line Items]              
Share-based compensation expense     $ 6,000 $ 5,900 $ 17,600 $ 14,700  
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2021.
[2] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2020.
[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.
[4] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2019 or 2020.