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Debt - Senior Secured Convertible Notes (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 28, 2019 | May 21, 2019
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Senior Secured Convertible Notes - May 2019 |  |  |  |
Debt |  |  |  |
Note Principal Amount |  |  |  | $ 2.4
Original Issue Discount |  |  |  | $ (0.5)
Senior Secured Convertible Notes |  |  |  |
Debt |  |  |  |
Note Principal Amount |  | $ 5.3 |  |
Original Issue Discount | $ (0.8) |  |  |
Senior Secured Convertible Notes - June 2019 |  |  |  |
Debt |  |  |  |
Note Principal Amount |  |  | $ 2.9 |
Original Issue Discount |  |  | $ (0.4) |

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