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Net loss per share - Basic and Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Numerator:        
Net loss $ (15,090) $ (11,886) $ (79,207) $ (43,755)
Denominator:        
Weighted average common shares outstanding, basic and diluted 34,744,275 28,499,475    
Net loss per share, basic and diluted $ (0.43) $ (0.42)    
Number of weighted average restricted common stock 9,761 77,223