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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 |

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