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PREFERRED STOCK AND STOCK-BASED COMPENSATION - Stock Options and RSUs (Details) - $ / shares
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Options to purchase shares of common stock activity    
Outstanding at January 1, 2020 25,241,896 24,694,990
Granted   5,888,532
Exercised   (3,313,666)
Expired   247,176
Forfeited   (1,780,784)
Outstanding December 31, 2020   25,241,896
Weighted average exercise price of the options granted   $ 4.06
Options to purchase common stock    
Options to purchase shares of common stock activity    
Outstanding at January 1, 2020 25,241,896  
Granted 2,877,446  
Exercised (672,562)  
Forfeited (130,709)  
Outstanding December 31, 2020 27,316,071 25,241,896
Weighted average exercise price of the options granted $ 2.70  
Restricted stock units    
RSUs activity    
Outstanding December 31, 2019 915,730  
Awarded 794,448 915,730
Forfeited (600)  
Outstanding December 31, 2020 1,709,578 915,730
RSUs subject to continued service and liquidity-based conditions    
RSUs activity    
Options and RSUs vesting period 699,448