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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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