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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