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Net loss per share (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2021
Mar. 31, 2020
Numerator:                    
Net loss attributable to common stockholders                 $ (80,870) $ (52,625)
Denominator:                    
Weighted average common shares outstanding, basic and diluted (in shares)                 46,248,969 34,261,548
Net loss per share attributable to common stockholders, basic and diluted (in dollars per share) $ (0.42) $ (0.44) $ (0.46) $ (0.44) $ (0.41) $ (0.46) $ (0.35) $ (0.30) $ (1.75) $ (1.54)