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Right-of-use asset and lease liabilities - Narrative (Details) € in Millions, $ in Millions	1 Months Ended	6 Months Ended
	Nov. 30, 2018 ft² item	Jun. 30, 2019 USD ($)	Jun. 30, 2019 EUR (€)	Dec. 01, 2017	Jun. 30, 2016	Mar. 31, 2016	Nov. 30, 2013
Leases
Area of facility (in square feet) | ft²	30,655
Weighted-average remaining lease term, Operating leases		10 years 10 months 24 days	10 years 10 months 24 days
Weighted-average discount rate, Operating leases		11.35%	11.35%
Lexington
Leases
Lease term (in years)	5 years						10 years
Number of subsequent renewals | item	2
Renewal term (in years)	5 years
Amsterdam
Leases
Lease term (in years)				10 years		16 years
Renewal term (in years)					5 years
Minimum rentals to be received		$ 9.1	€ 8.0

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- Definition

The number of renewals allowed in an operating lease arrangement.

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Area of land held.

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Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

+ References

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Weighted average discount rate for operating lease calculated at point in time.

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