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Summary of significant accounting policies - Narrative (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)	$ (839,624)		$ (814,108)
ASC 606 Adjustment	(3,937)
Allowance for doubtful accounts receivable	500		$ 800
Adjustments
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Retained earnings (accumulated deficit)		$ 3,300
Variable consideration	$ 600

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