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CONVERTIBLE PREFERRED STOCK AND COMMON STOCK - Schedule of Convertible Preferred Stock (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 409,351,021 409,351,021 321,346,716  
Convertible preferred stock, shares outstanding 175,528,225 175,437,783 191,139,933 186,466,181
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 220,955 $ 220,563 $ 231,129 $ 218,931
Convertible preferred stock, liquidation preference $ 258,084 $ 257,947 $ 258,041  
Series 1 convertible preferred stock, 4,305 shares authorized 4,305 4,305 4,305  
Series 1 convertible preferred stock, shares outstanding 2,961 2,961 2,961  
Authorized Shares (in shares) 409,351,021      
Outstanding Shares (in shares) 175,531,186      
Series D'        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 190,000,000 190,000,000 102,000,000  
Convertible preferred stock, shares outstanding 105,386,149 105,386,149 78,932,752  
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 129,339      
Convertible preferred stock, liquidation preference $ 161,515 $ 161,516 $ 120,972  
Series D        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 87,235,535 87,235,535 87,235,535  
Convertible preferred stock, shares outstanding 33,483,143 33,392,701 35,586,652  
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 46,979      
Convertible preferred stock, liquidation preference $ 51,316 $ 51,178 $ 54,540  
Series C        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 64,129,209      
Convertible preferred stock, shares outstanding 23,298,388      
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 35,293      
Convertible preferred stock, liquidation preference $ 35,514      
Series B        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 36,969,407 36,969,407 36,969,407  
Convertible preferred stock, shares outstanding 9,185,302 9,185,302 9,126,596  
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 7,049      
Convertible preferred stock, liquidation preference $ 7,123 $ 7,123 $ 7,078  
Series A'        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 30,991,277      
Convertible preferred stock, shares outstanding 4,158,503      
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 1,702      
Convertible preferred stock, liquidation preference $ 1,865      
Series A        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized 21,288      
Convertible preferred stock, shares outstanding 16,740      
Convertible preferred stock, $0.00001 par value; 409,351,021 and 321,346,716 shares authorized as of December 31, 2020 and 2019, respectively; 175,437,783 and 191,139,933 shares issued and outstanding as of December 31, 2020 and 2019, respectively; (liquidation preference of $257,947 and $258,041 as of December 31, 2020 and 2019, respectively) $ 593      
Convertible preferred stock, liquidation preference $ 751      
Series 1        
Class of Stock [Line Items]        
Convertible preferred stock, shares authorized   4,305 4,305  
Convertible preferred stock, shares outstanding   2,961 2,961  
Series 1 convertible preferred stock, 4,305 shares authorized 4,305      
Series 1 convertible preferred stock, shares outstanding 2,961