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Net loss per share - Numerator and Denominator (Details) - USD ($)
$ / shares in Units, $ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Numerator        
Net loss $ (181,427) $ (41,789) $ (294,114) $ (113,902)
Denominator        
Denominator for basic and diluted net loss per share (in shares) 65,150,780 55,912,748 63,769,958 57,113,141
Net loss per share:        
Basic and diluted (in dollars per share) $ (2.78) $ (0.75) $ (4.61) $ (1.99)