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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Detail) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]      
Insurance premiums $ 61 $ 501 $ 625
Kits for clinical use     162
Taxes 53    
Security Deposit 50 50  
Other 221 147 173
Other prepaid expense including security deposit   197  
Total prepaid expenses and other current assets $ 385 $ 698 $ 960