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Other current assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Other current assets    
Corporate tax receivable $ 18,605 $ 11,454
Prepayments 9,059 6,120
Clinical materials 2,993 3,760
Other current assets 1,969 382
Other current assets, Total $ 32,626 $ 21,716