Quarterly report pursuant to Section 13 or 15(d)

Capitalization and Equity Structure - Additional Information (Details)

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Capitalization and Equity Structure - Additional Information (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
May 24, 2019
Jan. 30, 2019
Aug. 21, 2018
Dec. 31, 2015
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
May 31, 2019
Mar. 08, 2019
Mar. 07, 2019
Sep. 30, 2017
Class of Stock [Line Items]                          
Common stock, shares authorized (in shares)         141,429,000   141,429,000   141,429,000        
Preferred Stock, shares authorized (in shares)         10,000,000   10,000,000   10,000,000        
Common stock, shares outstanding (in shares)         74,953,000   74,953,000   62,963,000        
Common stock, shares issued (in shares)         74,953,000   74,953,000   62,963,000        
Preferred stock, shares outstanding (in shares)         0   0   0        
Preferred stock, shares issued (in shares)         0   0   0        
Proceeds from issuance of common stock and warrants, net             $ 2,313,000            
Financing costs         $ 0 $ 0 $ 706,000 $ 0          
Warrants issued (in shares)             6,667,000            
Loss on modification of warrants         $ 0 $ 0 $ 257,000 $ 0          
2019 Warrants                          
Class of Stock [Line Items]                          
Proceeds from issuance of common stock and warrants, net $ 7,334,000                        
Warrants called (in shares)                   6,667,000      
Exercise price (in dollars per share)         $ 2   $ 2     $ 2      
Warrants issued (in shares)             6,667,000            
2015 Warrants                          
Class of Stock [Line Items]                          
Exercise price (in dollars per share)       $ 3.74 2.75   $ 2.75            
Warrants issued (in shares)       2,122,000     0            
Information Agent Warrants                          
Class of Stock [Line Items]                          
Warrants called (in shares)                         200,000
Exercise price (in dollars per share)         1.5   $ 1.5           $ 1.5
Warrants issued (in shares)             0            
2015 Warrants, Amendment                          
Class of Stock [Line Items]                          
Exercise price (in dollars per share)                     $ 2.75 $ 3.74  
Underwriting agreement                          
Class of Stock [Line Items]                          
Proceeds from issuance of common stock and warrants, net $ 10,000,000                        
Common Stock                          
Class of Stock [Line Items]                          
Number of shares sold (in shares)   3,067,000                      
Price per share sold (in dollars per share)   $ 1.63                      
Amount received from sale of shares   $ 5,000,000                      
Direct financing costs   $ 8,000                      
Common Stock | At-The-Market Offering                          
Class of Stock [Line Items]                          
Aggregate value of offering     $ 25,000,000                    
Number of shares sold (in shares)             1,294,000            
Price per share sold (in dollars per share)         $ 1.85   $ 1.85            
Value of stock available for issuance             $ 17,734,000            
Common Stock | Underwriting agreement                          
Class of Stock [Line Items]                          
Number of shares sold (in shares) 6,667,000                        
Price per share sold (in dollars per share) $ 1.5                        
Proceeds from issuance of common stock and warrants, net $ 2,666,000                        
Direct financing costs 963,000                        
Issuance costs in APIC 257,000                        
Financing costs $ 706,000                        
Warrants called (in shares) 6,667,000                        
Exercise price (in dollars per share) $ 2.00                        
Warrant                          
Class of Stock [Line Items]                          
Warrants exercised (in shares)             0   518,000