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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 | Sep. 30, 2019 shares | Dec. 31, 2018 $ / shares shares | Dec. 31, 2017 shares | Dec. 31, 2016 shares
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Sale of common stock, net of expenses (in shares) | 6,669 | 606 |  |  |  |
Number of pre-funded warrants |  | 109 |  |  |  |
Net proceeds from issuance of private placement | $ |  | $ 4.3 |  |  |  |
Number of warrants outstanding (in shares) |  |  | 1,002,024 | 93,835 | 20 | 1
Contractual Term [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants expiration period |  |  | 5 years |  |  |
Volatility [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  | 2.018 |  |  |
Risk Free Rate [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  | 0.016 |  |  |
February 2018 Warrants [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants issued to purchase Common Stock |  | 429 |  |  |  |
Value of warrants issued | $ |  | $ 18.3 |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  |  | $ 7,000 |  |
Number of warrants outstanding (in shares) |  |  |  | 273 |  |
February 2018 Warrants [Member] | Exercise Price [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input | $ / shares |  | 7,000 |  |  |  |
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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