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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, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Numerator        
Net loss $ (41,789) $ (9,520) $ (113,902) $ (28,782)
Denominator        
Denominator for basic and diluted net loss per share (in shares) 55,912,748 46,137,833 57,113,141 46,257,397
Net loss per share:        
Basic and diluted (in dollars per share) $ (0.75) $ (0.21) $ (1.99) $ (0.62)