Annual report pursuant to Section 13 and 15(d)

SHARE-BASED COMPENSATION - Restricted Stock Units Activity (Details)

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SHARE-BASED COMPENSATION - Restricted Stock Units Activity (Details) - 2018 Equity Incentive Plan - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Mar. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Restricted stock units, number of shares issued (in shares)   1,031,740 36,657 202,200  
Restricted stock units, number of shares forfeited (in shares)   (21,277) (60,421)    
Stock option expense, not yet recognized   $ 400      
Restricted Stock Units (RSUs) - Service Based          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Restricted stock units, unvested, beginning of period   53,571,000 107,142,000 0  
Restricted stock units, number of shares issued (in shares)   892,142,000 36,657,000 107,142,000  
Restricted stock units, number of shares vested (in shares)   (328,035,000) (53,571,000)    
Restricted stock units, number of shares forfeited (in shares)   (21,277,000) (36,657,000)    
Restricted stock units, unvested, end of period 53,571,000 596,401,000 53,571,000 107,142,000  
Restricted stock units, grant-date fair value (in dollars per share)   $ 2,930 $ 6,820 $ 7,000.00  
Restricted stock units, forfeiture fair value (in dollars per share)   $ 2,350 $ 6,820    
Restricted stock units, grants fair value   $ 2,617 $ 250 $ 750  
Restricted stock units, vesting fair value   1,150 $ 171    
Stock option expense, not yet recognized   $ 1,600      
Share-based awards, compensation cost recognition period (in years)   2 years 2 months 12 days      
Restricted Stock Units (RSUs) - Performance Based With Market Condition          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Restricted stock units, unvested, beginning of period   71,383,000 95,057,000 0  
Restricted stock units, number of shares issued (in shares) 95,057 139,598,000   95,057,000  
Restricted stock units, number of shares forfeited (in shares)   (71,383,000) (23,674,000)    
Restricted stock units, unvested, end of period 71,383,000 139,598,000 71,383,000 95,057,000  
Restricted stock units, grant-date fair value (in dollars per share)   $ 2,560   $ 10,520  
Restricted stock units, forfeiture fair value (in dollars per share)   $ 10,520 $ 10,520    
Restricted stock units, grants fair value   $ 358   $ 1,000  
Liability-classified award fair value   800      
Stock option expense, not yet recognized   $ 200      
Share-based awards, compensation cost recognition period (in years)   2 years 7 months 6 days      
Accrued compensation expense   $ 300      
Restricted Stock Units (RSUs) - Performance Based With Market Condition | Subsequent Event          
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]          
Liability-classified award fair value         $ 800