XML 45 R33.htm IDEA: XBRL DOCUMENT v3.19.2
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