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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, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Numerator        
Net loss $ (59,997) $ (50,969) $ (173,899) $ (79,751)
Denominator        
Denominator for basic and diluted net loss per share (in shares) 56,463,528 48,096,521 57,798,968 45,310,690
Net loss per share:        
Basic and diluted (in dollars per share) $ (1.06) $ (1.06) $ (3.01) $ (1.76)