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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, 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
Mezzanine stock, aggregate liquidation preference $ 216,574 $ 213,484   $ 201,368    
Redeemable preferred stock            
Mezzanine stock, par value $ 0.01 $ 0.01   $ 0.01    
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    
Mezzanine stock, aggregate liquidation preference $ 37,451 $ 36,520