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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Sep. 30, 2017
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]    
Research and development claims receivable $ 7,191 $ 4,069
Prepayments 2,208 681
VAT receivable 1,274 248
Other asset 717 0
Grant income receivable 678 279
Other receivable 121 135
Total prepaid expenses and other current assets $ 12,189 $ 5,412