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Commitments and contingencies (Details)
€ in Millions, $ in Millions
56 Months Ended
May 31, 2005
EUR (€)
May 31, 2005
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2016
USD ($)
Dec. 31, 2015
EUR (€)
Dec. 31, 2015
USD ($)
Grant Commitments            
Proceeds from grant commitments € 3.6 $ 3.8        
Interest rate     5.70% 5.70% 5.70% 5.70%
Grant commitments, carrying value     € 6.4 $ 6.8 € 6.1 $ 6.6