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PREFERRED STOCK AND SHAREHOLDERS' EQUITY - Main Terms of Redeemable Convertible Preferred Stock Options (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
Jul. 31, 2020
Dec. 31, 2019
Redeemable convertible preferred stock      
Mezzanine Equity [Line Items]      
Dividend rate 6.00%    
Liquidation preference interest rate 6.00%    
Liquidation preference amount for holders of preferred shares $ 148,665    
Liquidation preference accrued interest 64,819   $ 52,703
Fair value of Convertible Preferred Stock 143,694    
Issuance costs related to Redeemable Convertible Preferred Stock 2,253    
Initial value of Redeemable Convertible Preferred Stock $ 141,441    
Series A Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price $ 0.1208325    
Series A-1 Redeemable Convertible Preferred Stock [Member]      
Mezzanine Equity [Line Items]      
Original issue price 0.148375    
Series B Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price 0.2982925    
Series B-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price 0.238625    
Series C Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price 0.4166675    
Series C-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price 0.3125    
Series C-2 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price $ 0.8200475    
Minimum percentage of issue price pursuant to conversion 250.00%    
Minimum Net Proceeds From Convertible Preferred Stock $ 25,000    
Series D Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price $ 1.6748    
Minimum percentage of issue price pursuant to conversion 200.00%    
Minimum Net Proceeds From Convertible Preferred Stock $ 50,000    
Series E Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price $ 6.28    
Minimum percentage of issue price pursuant to conversion 75.00%    
Series E-1 Redeemable Convertible Preferred Stock      
Mezzanine Equity [Line Items]      
Original issue price $ 7.07    
Minimum percentage of issue price pursuant to conversion 75.00%    
Minimum Net Proceeds From Convertible Preferred Stock $ 50,000    
Redeemable preferred stock      
Mezzanine Equity [Line Items]      
Original issue price $ 10,000 $ 10,000