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Other current assets (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Other current assets |  |
Corporate tax receivable | $ 22,072 | $ 16,459
Prepayments | 8,284 | 6,279
Clinical materials | 862 | 1,087
VAT receivable | 416 | 1,505
Other current assets | 509 | 439
Total | $ 32,143 | $ 25,769

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