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Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Millions |  | 6 Months Ended |
--- | --- | --- | ---
Aug. 09, 2019 USD ($) $ / shares shares | Jun. 30, 2019 Segments $ / shares | Dec. 31, 2018 $ / shares
Class of Stock [Line Items] |  |  |
Preferred stock, par value |  | $ 0.001 | $ 0.001
Number of reportable segments | Segments |  | 1 |
Subsequent Event | Series E Preferred Stock |  |  |
Class of Stock [Line Items] |  |  |
Preferred stock issued (in shares) | shares | 10,000 |  |
Preferred stock, par value | $ 0.001 |  |
Preferred stock issued during the period | $ | $ 10.0 |  |

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