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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Research and development tax credit receivable $ 1,710 $ 1,148
Prepayments and VAT receivable 1,045 899
Other current assets 236 236
Prepaid expenses and other current assets $ 2,991 $ 2,283