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Revenue recognition - Comprehensive Income Impacts (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	$ (19,263)	$ (29,057)
Other comprehensive loss:
Unrealized loss on marketable securities	(123)	(22)
Foreign currency translation gain	1,107	631
Comprehensive loss	(18,279)	$ (28,448)
Adjustments | ASU 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(749)
Other comprehensive loss:
Unrealized loss on marketable securities	0
Foreign currency translation gain	0
Comprehensive loss	(749)
Balances without adoption of Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net loss	(20,012)
Other comprehensive loss:
Unrealized loss on marketable securities	(123)
Foreign currency translation gain	1,107
Comprehensive loss	$ (19,028)

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- Definition

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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