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Earnings per share - Numerator and Denominator (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Numerator |  |  |  |  |  |  |  |  |  |  |
Net loss | $ (77,677) | $ (59,997) | $ (41,789) | $ (72,113) | $ (48,330) | $ (50,969) | $ (9,520) | $ (19,263) | $ (251,576) | $ (128,081) | $ (79,000)
Denominator |  |  |  |  |  |  |  |  |  |  |
Denominator for basic and diluted net loss per share (in shares) |  |  |  |  |  |  |  |  | 58,863,185 | 46,576,313 | 39,183,073
Net loss per share: |  |  |  |  |  |  |  |  |  |  |
Basic and diluted (in dollars per share) |  |  |  |  |  |  |  |  | $ (4.27) | $ (2.75) | $ (2.02)

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