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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dec. 31, 2017
Prepaid Expense And Other Assets Current [Abstract]      
Clinical trial expenses $ 500    
Financing costs     $ 70
Insurance premiums 54 $ 140 421
Security deposit 50 51 50
Income tax and VAT receivable 33 579 29
Other 227 128 130
Total prepaid expenses and other current assets $ 864 $ 898 $ 700