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Property, plant and equipment, net - Long-lived assets by geographic region (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Long-lived assets    
Long-lived assets $ 35,702 $ 26,011
Lexington, US    
Long-lived assets    
Long-lived assets 19,552 21,594
Europe    
Long-lived assets    
Long-lived assets $ 16,150 $ 4,417