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Nature of Business and Basis of Presentation - Reverse Stock Split (Details) | Oct. 10, 2018 $ / shares shares | Oct. 09, 2018 $ / shares shares | Sep. 30, 2018 $ / shares shares
--- | --- | --- | ---
Class of Stock [Line Items] |  |  |
Common stock, shares authorized |  |  | 300,000,000
Common stock, par value (in dollars per share) | $ / shares |  |  | $ 0.01
Subsequent Event |  |  |
Class of Stock [Line Items] |  |  |
Reverse stock split ratio | 0.0833 |  |
Common stock, shares outstanding | 90,811,562 | 1,089,738,735 |
Common stock, shares authorized | 300,000,000 | 3,500,000,000 |
Common stock, par value (in dollars per share) | $ / shares | $ 0.01 | $ 0.00001 |

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