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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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- Definition

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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