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Other current assets (Details) - USD ($)
$ in Thousands
Jul. 31, 2020
Jun. 30, 2020
Dec. 31, 2019
Other current assets      
Corporate tax receivable   $ 26,746 $ 19,284
Prepayments   7,903 8,395
Clinical materials   1,521 1,459
Other current assets   2,929 1,809
Total   $ 39,099 $ 30,947
Research & Development Tax Credits      
Other current assets      
Corporate tax receivable $ 18,700