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Revenue recognition - Comprehensive Income Impacts (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (50,969)	$ (33,738)	$ (79,751)	$ (80,270)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	33	31	(50)	0
Foreign currency translation (loss) gain	(260)	983	(2,291)	4,498
Comprehensive loss	(51,196)	$ (32,724)	(82,092)	$ (75,772)
Adjustments | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(817)		(975)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	0		0
Foreign currency translation (loss) gain	0		0
Comprehensive loss	(817)		(975)
Balances without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(51,786)		(80,726)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	33		(50)
Foreign currency translation (loss) gain	(260)		(2,291)
Comprehensive loss	$ (52,013)		$ (83,067)

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Amount after tax of increase (decrease) in equity from transactions and other events and circumstances from net income and other comprehensive income, attributable to parent entity. Excludes changes in equity resulting from investments by owners and distributions to owners.

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