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Summary of significant accounting policies (Details)
€ in Millions
12 Months Ended
Jul. 31, 2014
EUR (€)
shares
Jul. 31, 2014
USD ($)
shares
Dec. 31, 2016
USD ($)
shares
Jul. 31, 2014
USD ($)
Earnings Per Common Share        
Dilutive securities (in shares)     0  
Lexington, US | 401(k) Plan        
Pensions        
Maximum annual employee contribution as a percent of pre-tax compensation     50.00%  
Amount of employer matching contribution for every employee dollar contributed | $     $ 0.50  
Maximum | Lexington, US | 401(k) Plan        
Pensions        
Percent of employee gross pay for which the employer makes a matching contribution     6.00%  
Leasehold improvements | Minimum | Lexington, US        
Property, plant and equipment, net        
Estimated useful life (in years)     P10Y  
Leasehold improvements | Minimum | Amsterdam        
Property, plant and equipment, net        
Estimated useful life (in years)     P10Y  
Laboratory equipment | Minimum        
Property, plant and equipment, net        
Estimated useful life (in years)     P5Y  
Laboratory equipment | Maximum        
Property, plant and equipment, net        
Estimated useful life (in years)     P10Y  
Office equipment | Minimum        
Property, plant and equipment, net        
Estimated useful life (in years)     P3Y  
Office equipment | Maximum        
Property, plant and equipment, net        
Estimated useful life (in years)     P5Y  
Licenses        
Intangible assets        
Estimated useful life (in years)     20 years  
InoCard        
Business combinations        
Total consideration of business acquisition € 4.3 $ 5,700,000    
Up-front cash-payment 1.5 2,000,000    
Value of shares issued € 1.5 $ 2,000,000    
Number of shares issued 189,982 189,982    
Contingent consideration € 1.3     $ 1,700,000