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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, 2019 $ / shares shares | Dec. 31, 2018 $ / shares shares | Dec. 21, 2018 USD ($) | Dec. 31, 2017 $ / shares 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) |  |  | 1,826,608 | 93,835 |  | 20
Maximum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  | $ 23 | $ 7,000 |  | $ 13,798,400,000
Minimum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants exercisable per share price (in dollars per share) | $ / shares |  |  | $ 7 | $ 7 |  | $ 857,500
Contractual Term [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants expiration period |  |  | 4 years 7 months 6 days |  |  |
Contractual Term [Member] | Maximum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants expiration period |  |  |  | 5 years 1 month 6 days |  |
Contractual Term [Member] | Minimum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants expiration period |  |  |  | 1 year 1 month 6 days |  |
Volatility [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  | 2.075 |  |  |
Volatility [Member] | Maximum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  |  | 2.653 |  |
Volatility [Member] | Minimum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  |  | 1.457 |  |
Risk Free Rate [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  | 0.017 |  |  |
Risk Free Rate [Member] | Maximum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  |  | 0.026 |  |
Risk Free Rate [Member] | Minimum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants measurement input |  |  |  | 0.025 |  |
February 2018 Warrants [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Warrants issued to purchase Common Stock |  | 1,429,000,000 |  |  |  |
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 |  |  |  |
Pre-Funded Series D Warrants [Member] | Maximum [Member] |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |
Maximum offering and selling of stock and securities that entity make to raise capital | $ |  |  |  |  | $ 100.0 |

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