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Subsequent Events (Details) - USD ($)
9 Months Ended 12 Months Ended
Nov. 21, 2018
Nov. 20, 2018
Nov. 09, 2018
Oct. 04, 2018
Sep. 30, 2018
Dec. 31, 2017
Subsequent Events            
Number of pre-funded warrants issued         889,921 106,376
Subsequent event            
Subsequent Events            
Minimum number of consecutive business days needed to meet required minimum closing bid price     30 days      
Common stock minimum bid price required for Nasdaq listing rule     $ 1.00      
Grace period provided with minimum bid price to regain compliance     180 days      
Common stock minimum bid price required to regain compliance     $ 1.00      
Number of consecutive business days required to regain compliance     10 days      
Subsequent event | October 2018 Equity Financing            
Subsequent Events            
Shares issued (in shares)       11,575,001    
Number of pre-funded warrants issued       3,425,000    
Purchase price of common stock       $ 0.60    
Gross proceeds from issuance of common stock       $ 7,000,000    
Purchase price of pre-funded warrants       $ 0.59    
Gross proceeds from issuance of pre-funded warrants       $ 2,000,000    
Actual cash received after deducting estimated fees and expenses       $ 8,300,000    
Subsequent event | Standstill Agreement | Convertible promissory note issued June 29,2017            
Subsequent Events            
Debt repayment   $ 1,500,000        
Redemption of debt $ 500,000          
Subsequent event | Standstill Agreement | Convertible promissory note issued June 29,2017 | Fails to repay Note            
Subsequent Events            
Redemption of debt $ 1,000,000