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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