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Warrants to Acquire Shares of Common Stock (Narrative) (Details)
 1 Months Ended 9 Months Ended
Apr. 30, 2018
USD ($)
shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Jul. 16, 2018
$ / shares
May 31, 2018
$ / shares
Dec. 29, 2017
$ / shares
Class of Warrant or Right [Line Items]          
Shares issued for cancellation of warrants (in shares)   54,613      
Surrender and cancellation of warrants (in shares)   121,667      
Common stock acquired in exchange for warrants (in shares)   412,667      
Fair value of consideration exchanged | $   $ 1,200,000      
Exercise price (usd per share) | $ / shares     $ 2.10 $ 6.59 $ 7.42
Series A Convertible Preferred          
Class of Warrant or Right [Line Items]          
Exercise price (usd per share) | $ / shares   $ 6.59      
Convertible Promissory Notes | Convertible Notes Payable          
Class of Warrant or Right [Line Items]          
Debt instrument, face amount | $   $ 1,000,000.0      
Common stock acquired in exchange for warrants (in shares)   412,667      
Warrants and rights outstanding | $ $ 800,000 $ 100,000      
Conversion of units (in shares) 118,644        
Measurement Input, Price Volatility          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding, measurement input         0.9010
Measurement Input, Risk Free Interest Rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding, measurement input   0     0.0220
Measurement Input, Expected Dividend Rate          
Class of Warrant or Right [Line Items]          
Warrants and rights outstanding, measurement input   0     0