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Stockholders' Equity - September 2018 Rights Offering - Additional Information (Details) - USD ($) $ in Millions | 1 Months Ended
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Sep. 30, 2018 | Feb. 28, 2018
Stockholders Equity Note [Abstract] |  |
Sale of common stock, net of expenses (in shares) | 6,669 | 606
Net proceeds from issuance of common stock | $ 7.0 |

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