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Prepaid Expenses and Other Current Assets (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2017
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Long-term Purchase Commitment [Line Items]            
Prepaid expenses and other current assets   $ 346   $ 346   $ 733
Research and development   1,908 $ 691 5,945 $ 2,963  
Prepaid insurance   104   104    
Cost to purchase research and development supplies   $ 76   76   100
Research and Development Arrangement            
Long-term Purchase Commitment [Line Items]            
Payments to acquire in-process research and development $ 22          
Research and development       $ 396   245
Supplies expense           $ 100