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Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands |  | 9 Months Ended |  |
--- | --- | --- | --- | ---
Aug. 09, 2019 USD ($) $ / shares shares | Sep. 30, 2019 USD ($) Segments $ / shares shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($)
Class of Stock [Line Items] |  |  |  |  |
Cash and cash equivalents |  | $ 13,945 | $ 31,547 | $ 31,015 | $ 21,198
Working capital |  | $ (119,300) |  |  |
Preferred stock, par value (in dollars per share) | $ / shares |  | $ 0.001 |  | $ 0.001 |
Preferred stock issued during the period |  | $ 10,000 | $ 0 |  |
Number of reportable segments | Segments |  | 1 |  |  |
Series E Preferred Stock |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |
Preferred stock issued (in shares) | shares | 10,000 | 10,000 |  | 0 |
Preferred stock, par value (in dollars per share) | $ / shares | $ 0.001 | $ 0.001 |  | $ 0 |
Preferred stock issued during the period | $ 10,000 |  |  |  |

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