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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
May 05, 2020 | Jul. 11, 2019 | Jun. 30, 2020 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019 | Aug. 19, 2019 | Jun. 06, 2019
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 |  |
Shares issued, par value per share |  |  | 0.01 | $ 0.01 |  | $ 0.01 |  |
Conversion price | $ 10.00 |  |  |  |  |  |  |
Offering price |  |  |  | $ 19,378 | $ 0 |  |  |
Warrant exercise price |  |  | $ 10.00 | $ 10.00 |  |  |  |
Deemed dividend for triggering of warrant down round feature |  |  | $ (55) | $ (55) |  |  |  |
Preferred stock, shares outstanding (in shares) |  |  | 25,950 | 25,950 |  | 41,517 |  |
Number of warrants outstanding (in shares) |  |  | 4,422,499 | 4,422,499 |  | 1,826,608 |  |
2019 Warrants [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Offering price | $ 22,000 |  |  |  |  |  |  |
Warrant exercise price | $ 10.00 |  |  |  |  | $ 23.04 |  |
Deemed dividend for triggering of warrant down round feature | $ 55 |  |  |  |  |  |  |
Number of warrants outstanding (in shares) |  |  | 1,800,000 | 1,800,000 |  |  |  |
Series E Convertible Preferred Stock [Member] | July 2019 Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Number of shares issued |  | 20,000 |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |
Shares issued, price per share |  | 1,000 |  |  |  |  |  |
Shares issued, par value per share |  | $ 0.01 |  |  |  |  |  |
Series E Preferred Stock and Related Warrants [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Conversion price |  |  |  |  |  |  |  | $ 1,500
Series E Preferred Stock and Related Warrants [Member] | July 2019 Private Placement [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Debt and warrants exchanged for preferred stock |  | $ 11,800 |  |  |  |  |  |
Number of preferred stock and warrants issued upon conversion |  | 11,500 |  |  |  |  |  |
Value of accounts payable exchanged |  | $ 100 |  |  |  |  |  |
Number of shares issued upon exchange of accounts payable |  | 149 |  |  |  |  |  |
Number of shares issued upon exchange of investor waiver rights |  | 923 |  |  |  |  |  |
Series E-1 Convertible Preferred Stock [Member] | August 2019 Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Number of shares issued |  |  |  |  |  |  | 9,510 |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  | $ 0.01 |
Shares issued, price per share |  |  |  |  |  |  | 1,000 |
Shares issued, par value per share |  |  |  |  |  |  | $ 0.01 |
Preferred Stock [Member] |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |
Conversion price | $ 10.00 |  |  |  |  | $ 23.04 |  |
Offering price | $ 22,000 |  |  |  |  |  |  |
Excess of the fair value of the common stock | $ 12,000 |  |  |  |  |  |  |

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