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STOCKHOLDER'S EQUITY - Narrative (Details)
$ / shares in Units, $ in Thousands
 1 Months Ended 3 Months Ended
May 05, 2020
right
May 01, 2019
$ / shares
Aug. 31, 2020
Mar. 31, 2021
USD ($)
$ / shares
shares
Mar. 31, 2020
USD ($)
shares
Dec. 31, 2020
$ / shares
shares
Class of Stock [Line Items]            
Share-based compensation expense | $       $ 5,685 $ 4,625  
Unrecognized compensation cost, weighted average period (in years)       2 years 7 months 6 days    
Common stock, shares authorized (in shares)       2,100,000,000    
Number of rights declared for each share of common stock | right 1          
Beneficial ownership acquired (as a percent) 10.00%          
Beneficial ownership acquired by passive investor (as a percent) 20.00%          
Vesting based on service conditions            
Class of Stock [Line Items]            
Unrecognized compensation cost | $       $ 48,400    
Vesting based on performance conditions            
Class of Stock [Line Items]            
Unrecognized compensation cost | $       1,100    
Restricted Stock Units (RSUs)            
Class of Stock [Line Items]            
Share-based compensation expense | $       $ 500    
Award vesting period (in months)     18 months      
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) | $ / shares       $ 0.001   $ 0.001
Class A Shares | Common Shares            
Class of Stock [Line Items]            
Conversion of Class B Shares to Class A Shares (in shares) [1]       (154,045) (5,915)  
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]       47,121,747 2,126,591  
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) | $ / shares       $ 0.001   $ 0.001
Class B Shares | Common Shares            
Class of Stock [Line Items]            
Conversion of Class B Shares to Class A Shares (in shares) [1]       154,045 5,915  
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]       22,337,312 616  
Preferred Stock            
Class of Stock [Line Items]            
Common stock, shares authorized (in shares)       100,000,000    
Common stock, par value (in dollars per share) | $ / shares       $ 0.001    
Special Warrants            
Class of Stock [Line Items]            
Special warrants, exercise price per share (in dollars per share) | $ / shares   $ 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%        
Special Warrants | Common Shares            
Class of Stock [Line Items]            
Conversion of Special Warrants to Class A and Class B Shares (in shares) [1]       (69,459,059) (2,127,207)  
Corporate Expenses            
Class of Stock [Line Items]            
Share-based compensation expense | $       $ 5,700 $ 4,600  
[1] The Company's Preferred Stock is not presented in the data above as there were no shares issued and outstanding in 2021.