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Net loss per share - Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Numerator    
Net loss $ (128,642) $ (112,687)
Denominator    
Denominator for basic and diluted net loss per share (in shares) 70,188,602 62,389,158
Net loss per share:    
Basic and diluted (in dollars per share) $ (1.83) $ (1.81)