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Convertible Preferred Stock - Shares Issued (Details) - USD ($) $ / shares in Units, $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Dec. 31, 2017 | Sep. 30, 2018 | Jun. 30, 2018
Class of Stock [Line Items] |  |  |  |  |
Shares issued (in shares) | 0 | 0 |  |  |
Share price (in dollars per share) |  |  |  | $ 1.49 |
Series B Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Value of shares issued |  |  | $ 15.0 |  |
Shares issued (in shares) |  |  | 8,691,179 |  |
Share price (in dollars per share) |  |  | $ 1.73 |  | $ 1.73

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