Annual report pursuant to Section 13 and 15(d)

Warrants - Additional Information (Details)

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Warrants - Additional Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Jan. 16, 2018
Dec. 27, 2016
Sep. 30, 2019
Sep. 30, 2018
Class Of Warrant Or Right [Line Items]        
Stock based compensation expense     $ 270 $ 497
Series B Convertible Preferred Stock Warrants        
Class Of Warrant Or Right [Line Items]        
Number of common shares into which each warrant may be exchanged     5  
Number of warrants outstanding     118,029  
Warrants additional extended expiration period 2 years      
Stock based compensation expense     $ 128 $ 270
Series B Convertible Preferred Warrants Expires on September 10, 2017        
Class Of Warrant Or Right [Line Items]        
Number of warrants outstanding   10,914    
Expiration date   Sep. 10, 2017    
Series B Convertible Preferred Warrants Expires on December 11, 2017        
Class Of Warrant Or Right [Line Items]        
Number of warrants outstanding   12,383    
Expiration date   Dec. 11, 2017    
Series B Convertible Preferred Warrants Expires on March 27, 2018        
Class Of Warrant Or Right [Line Items]        
Number of warrants outstanding   54,396    
Expiration date   Mar. 27, 2018    
Series B Convertible Preferred Warrants Expires on March 28, 2018        
Class Of Warrant Or Right [Line Items]        
Number of warrants outstanding   17,857    
Expiration date   Mar. 28, 2018    
Series B Convertible Preferred Warrants Expires on December 3, 2019        
Class Of Warrant Or Right [Line Items]        
Number of warrants outstanding     22,479  
Expiration date     Dec. 03, 2019