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Revenue recognition - Comprehensive Income Impacts (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (9,520)	$ (17,475)	$ (28,782)	$ (46,532)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	40	(9)	(83)	(31)
Foreign currency translation gain	(3,138)	2,884	(2,031)	3,515
Comprehensive loss	(12,618)	$ (14,600)	(30,896)	$ (43,048)
Adjustments | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	591		(158)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	0		0
Foreign currency translation gain	0		0
Comprehensive loss	591		(158)
Balances without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(8,929)		(28,940)
Other comprehensive loss:
Unrealized gain (loss) on marketable securities	40		(83)
Foreign currency translation gain	(3,138)		(2,031)
Comprehensive loss	$ (12,027)		$ (31,054)

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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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