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Stockholders' Equity - February 2018 Financing - Additional Information (Details) $ / shares in Units, $ in Millions | 1 Months Ended |  |  |
--- | --- | --- | --- | ---
Sep. 30, 2018 shares | Feb. 28, 2018 USD ($) $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 $ / shares shares | Dec. 31, 2016 $ / shares shares
Stockholders Equity Note [Line Items] |  |  |  |  |
Sale of common stock, net of expenses (in shares) | 4,667,811 | 424,000 |  |  |
Number of pre-funded warrants |  | 76,000 |  |  |
Net proceeds from issuance of private placement | $ |  | $ 4.3 |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  | $ 0.22 | $ 1,569 | $ 910,000
Number of warrants outstanding (in shares) |  |  | 65,685,269 | 14,049 | 78
February 2018 Warrants [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Warrants issued to purchase Common Stock |  | 1,000,000 |  |  |
Value of warrants issued | $ |  | $ 18.3 |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  | $ 10.00 |  |
Number of warrants outstanding (in shares) |  |  | 200,000 |  |
February 2018 Warrants [Member] | Exercise Price [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Warrants measurement input | $ / shares |  | 10.00 |  |  |
February 2018 Warrants [Member] | Contractual Term [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Warrants expiration period |  | 6 years |  |  |
February 2018 Warrants [Member] | Volatility [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Warrants measurement input |  | 1.2268 |  |  |
February 2018 Warrants [Member] | Risk Free Rate [Member] |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |
Warrants measurement input |  | 0.01 |  |  |

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