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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expense And Other Assets Current [Abstract]      
Insurance premiums $ 337 $ 421 $ 501
Financing costs   70  
VAT/GST receivable 34 29  
Security deposit 49 50 50
Other 134 130  
Other   159 147
Total prepaid expenses and other current assets $ 554 $ 700 $ 698