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Nature of Business and Basis of Presentation - Additional Information (Details) $ in Millions |  |  | 1 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jun. 26, 2019 USD ($) | Jun. 11, 2019 USD ($) | May 08, 2019 shares | May 07, 2019 shares | Apr. 30, 2019 shares | Oct. 31, 2018 shares
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |
Common stock, shares outstanding |  |  |  |  | 13,709,330 | 7,972,686
Common stock, shares authorized |  |  |  |  | 225,000,000 | 225,000,000
Preferred stock, shares authorized |  |  |  |  | 250,000 |
EMRE [Member] | Hercules Capital, Inc. [Member] | Scenario Forecast [Member] |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |
Repayments of loan | $ | $ 6.0 |  |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |
Reverse stock split |  |  | 1-for-12 reverse stock split |  |  |
Reverse stock split, conversion ratio |  |  | 0.084 |  |  |
Common stock, shares outstanding |  |  | 15,284,269 | 183,411,230 |  |
Common stock, shares authorized |  |  | 225,000,000 |  |  |
Preferred stock, shares authorized |  |  | 250,000 |  |  |
Subsequent Event [Member] | Hercules Capital, Inc. [Member] |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |
Repayments of loan | $ |  | $ 1.4 |  |  |  |
Subsequent Event [Member] | EMRE [Member] |  |  |  |  |  |
Nature Of Business And Basis Of Presentation [Line Items] |  |  |  |  |  |
License agreement payment received | $ |  | $ 10.0 |  |  |  |

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