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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Prepaid Expense and Other Assets, Current [Abstract]    
Prepaid clinical trial costs $ 4,871 $ 7,210
Prepaid insurance 839 393
Other 886 487
Total prepaid expenses and other current assets $ 6,596 $ 8,090