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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

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