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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]    
Insurance premiums $ 140 $ 421
Financing costs   70
Security deposit 51 50
Income tax and VAT receivable 579 29
Other 128 130
Total prepaid expenses and other current assets $ 898 $ 700