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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mezzanine stock, aggregate liquidation preference   $ 36,520        
Common stock, par value $ 0.01 $ 0.01   $ 0.01    
Common stock, shares authorized 173,274,443 170,274,443   159,391,312    
Common stock, shares issued 26,435,097 25,855,413   19,983,799    
Common stock, shares outstanding 26,435,097 25,855,413   19,983,799    
Redeemable convertible preferred stock            
Mezzanine stock, par value $ 0.01 $ 0.01   $ 0.01    
Mezzanine stock, aggregate liquidation preference $ 216,574 $ 213,484   $ 201,368    
Mezzanine stock, shares authorized 111,452,020 111,452,020   111,452,020    
Mezzanine stock, shares issued 111,452,020 111,452,020   111,452,020    
Mezzanine stock, shares outstanding 111,452,020 111,452,020 111,452,020 111,452,020 111,452,020 111,452,020
Redeemable preferred stock            
Mezzanine stock, par value $ 0.01 $ 0.01   $ 0.01    
Mezzanine stock, aggregate liquidation preference $ 37,451 $ 36,520        
Mezzanine stock, shares authorized 3,500 3,500   3,500    
Mezzanine stock, shares issued 3,500 3,500   3,500    
Mezzanine stock, shares outstanding 3,500 3,500   3,500