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Income taxes - Loss from operations before tax (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Income Tax Disclosure [Abstract]      
Domestic $ (68,461) $ (54,588) $ (61,446)
Foreign (59,649) (23,077) (80,095)
Total $ (128,110) $ (77,665) $ (141,541)