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Stockholders' Equity - Preferred Stock Issuances - Additional Information (Details) - USD ($) |  |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Aug. 19, 2019 | Jul. 11, 2019 | Mar. 29, 2019 | Mar. 29, 2019 | Nov. 06, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017 | Nov. 05, 2018
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01 | $ 0.01 |
Fair value of warrants issued |  |  |  |  |  |  | $ 20,844,000 | $ 28,539,000 | $ 28,539,000 | $ 16,953,000 |
Preferred stock, aggregate stated value |  |  |  |  |  | $ 0 | $ 0 |  | $ 0 | $ 0 |
2019 Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Fair value of warrants issued |  |  |  |  |  | $ 20,800,000 |  |  |  |  |
Series E Convertible Preferred Stock [Member] | July 2019 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from private placement, gross |  | $ 20,000,000 |  |  |  |  |  |  |  |  |
Series E Convertible Preferred Stock [Member] | July 2019 Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  | 20,000 |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  | $ 0.01 |  |  |  |  |  |  |  |  |
Shares issued, price per share |  | $ 1,000 |  |  |  |  |  |  |  |  |
Series E-1 Convertible Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Conversion of stock, description |  |  |  |  |  |  | The Conversion Price and the Exercise Price may, upon each of (i) the third trading day following the date that the Company effects a reverse stock split, (ii) the date that the initial registration statement to be filed pursuant to the Registration Rights Agreement (as further discussed below) is declared effective by the United States Securities and Exchange Commission (“SEC”), and (iii) in the event that all of the registrable securities (as defined in the Registration Rights Agreement) are not then registered on an effective registration statement, the date that all of the shares underlying the Preferred Stock and Warrants may be sold pursuant to Rule 144, be reduced, and only reduced, to equal the lesser of (x) the then effective Conversion Price or Exercise Price, as applicable, and (y) 90% of the average of the five daily volume weighted average prices of the Common Stock immediately prior to such dates. |  |  |  |
Series E-1 Convertible Preferred Stock [Member] | August 2019 Private Placement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Proceeds from private placement, gross | $ 9,500,000 |  |  |  |  |  |  |  |  |  |
Series E-1 Convertible Preferred Stock [Member] | August 2019 Private Placement [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued | 9,510 |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) | $ 0.01 |  |  |  |  |  |  |  |  |  |
Shares issued, price per share | $ 1,000 |  |  |  |  |  |  |  |  |  |
Preferred Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt instrument, conversion price |  |  |  |  |  | $ 23.04 | $ 23.04 |  |  |  |
Exercise price of warrants |  |  |  |  |  | $ 23.04 | $ 23.04 |  |  |  |
Warrant exercisable term |  |  |  |  |  | 5 years |  |  |  |  |
Net proceeds from issuance of preferred stock |  |  |  |  |  | $ 26,500,000 |  |  |  |  |
Beneficial conversion feature |  |  |  |  |  | 18,300,000 |  |  |  |  |
Series E Preferred Stock and Related Warrants [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Debt and warrants exchanged for preferred stock |  |  |  |  |  | $ 11,800,000 |  |  |  |  |
Number of preferred stock and warrants issued upon conversion |  |  |  |  |  | 11,500 |  |  |  |  |
Value of accounts payable exchanged |  |  |  |  |  | $ 100,000 |  |  |  |  |
Number of shares issued upon exchange of accounts payable |  |  |  |  |  | 149 |  |  |  |  |
Number of shares issued upon exchange of investor waiver rights |  |  |  |  |  | 923 |  |  |  |  |
Series D Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, par value (in dollars per share) |  |  |  |  |  |  |  |  |  |  | $ 0.01
Preferred stock, aggregate stated value |  |  | $ 1,160,000 | $ 1,160,000 |  |  |  |  |  |  |
Proceeds from exchange of senior secured promissory note |  |  | 400,000 |  |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  |  | 1,560,000 | 1,560,000 |  |  |  |  |  |  |
Series D Preferred Shares [Member] | Common Stock [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Number of preferred stock and warrants issued upon conversion |  |  |  |  | 2,366 |  |  |  |  |  |
Series D Preferred Shares [Member] | Securities Purchase Agreement [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued |  |  |  |  | 101 |  |  |  |  |  |
Subsequent Event [Member] | Series D Preferred Shares [Member] |  |  |  |  |  |  |  |  |  |  |
Stockholders Equity Note [Line Items] |  |  |  |  |  |  |  |  |  |  |
Preferred stock, aggregate stated value |  |  | 1,160,000 | 1,160,000 |  |  |  |  |  |  |
Proceeds from exchange of senior secured promissory note |  |  |  | 400,000 |  |  |  |  |  |  |
Issuance of senior secured promissory note in exchange of preferred stock |  |  | 1,560,000 | 1,560,000 |  |  |  |  |  |  |
Preferred stock, value outstanding |  |  | $ 0 | $ 0 |  |  |  |  |  |  |

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