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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2018	Sep. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Inventory write-down	$ 1,600
Allowance for doubtful accounts receivable	600	$ 600		$ 800
Deferred tax liability	115,200	115,200		0
Retained earnings (accumulated deficit)	$ (890,593)	(890,593)		$ (814,108)
ASC 606 Adjustment		(3,937)
Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)			$ 3,300
Variable consideration		$ 600

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