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Net loss per share - Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Numerator        
Net loss $ (133,624) $ (69,692) $ (380,636) $ (363,806)
Denominator        
Denominator for basic and diluted net loss per share (in shares) 70,585,938 67,641,171 70,397,846 65,068,281
Net loss per share:        
Basic and diluted (in dollars per share) $ (1.89) $ (1.03) $ (5.41) $ (5.59)