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Prepaid Expenses and Other Current Assets - Schedule of Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Prepaid Expense And Other Assets Current [Abstract]    
Insurance premiums $ 278 $ 625
Kits for clinical use 261 162
Deferred finance costs 452  
Other 254 173
Total prepaid expenses and other current assets $ 1,245 $ 960