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Debt (Convertible Debt) (Details) - USD ($)
1 Months Ended 9 Months Ended
Apr. 30, 2018
Sep. 30, 2018
Debt Instrument [Line Items]    
Common stock acquired in exchange for warrants (in shares)   412,667
Convertible Notes Payable | Convertible Promissory Notes    
Debt Instrument [Line Items]    
Debt instrument, face amount   $ 1,000,000.0
Common stock acquired in exchange for warrants (in shares)   412,667
Debt instrument, interest rate, stated percentage   5.00%
Debt instrument, convertible, conversion price (in USD per share)   $ 7.00
Warrants and rights outstanding $ 800,000 $ 100,000
Conversion of units (in shares) 118,644