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Income taxes - Tax rate reconciliation (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Tax rate reconciliation
Net loss before tax for the period	$ (72,229)	$ (83,262)	$ (50,312)
Expected tax benefit / (expense) at the tax rate enacted in the Netherlands (25%)	18,057	20,816	12,578
Difference in tax rates between the Netherlands and foreign countries	1,905	1,816	819
Net change in valuation allowance	(20,054)	(16,301)	(10,843)
Non deductible expenses	(1,323)	(4,984)	(2,111)
Deductible expenses directly recognized in equity		168	139
Change in fair value of contingent consideration	270	(336)	(47)
Income tax benefit / (expense)	$ (1,145)	$ 1,179	$ 535
Tax rate enacted in the Netherlands	25.00%	25.00%	25.00%
Non-deductible expenses, Share-based compensation	$ 1,600	$ 2,900	$ 2,100
Non-deductible expenses, Derivatives	$ 0	$ 1,900	$ 0

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- Definition

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible expenses that are directly recognized in equity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible results on derivative financial instruments.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of income (loss) from continuing operations before deduction of income tax expense (benefit) and income (loss) attributable to noncontrolling interest, and addition of income (loss) from equity method investments.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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