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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Dec. 31, 2016
Prepaid Expense And Other Assets Current [Abstract]      
Insurance premiums $ 168 $ 421 $ 501
Security deposit 50 50 50
VAT/GST receivable 37 29  
Software 26 15  
Financing costs 25 70  
Other 76 115  
Other   159 147
Total prepaid expenses and other current assets $ 382 $ 700 $ 698