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Related Party Transactions - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Nov. 15, 2018
Aug. 23, 2018
Jun. 08, 2018
May 17, 2018
Nov. 09, 2017
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Feb. 28, 2019
Sep. 30, 2018
Apr. 16, 2018
Feb. 15, 2018
Jan. 19, 2018
Related Party Transaction [Line Items]                            
Fees incurred to law firm           $ 85,000 $ 61,000 $ 131,000 $ 112,000          
Accrued liabilities for unbilled services           30,000   30,000     $ 60,000      
Outstanding loan amount           $ 26,000   $ 26,000     $ 26,000      
Common stock, shares issued (in shares)           5,291,494   5,291,494     5,113,400 232,558    
Common stock, par value (usd per share)           $ 0.01   $ 0.01     $ 0.01 $ 2.15    
Share price (in usd per share)                       $ 2.18    
Number of securities called by warrants or rights (in shares)                   728,155   232,558    
Exercise price of warrant (in usd per share)                   $ 1.18   $ 2.50    
9% Preferred Stock, Series A, Voting, Cumulative, Convertible                            
Related Party Transaction [Line Items]                            
Shares issued upon conversion (in shares)       1,902                    
Conversion price (usd per share)           $ 4.23   $ 4.23            
Shares converted (in shares) 718 717 905                      
9% Preferred Stock, Series A, Voting, Cumulative, Convertible | Director                            
Related Party Transaction [Line Items]                            
Sale of stock, consideration received on transaction         $ 500,000                  
sale of stock, price per share (USD per share)         $ 762.85                  
Sale of stock, percentage of ownership after transaction         5.00%                  
Common Stock                            
Related Party Transaction [Line Items]                            
Shares issued upon conversion (in shares) 169,741 169,485 213,437                      
Convertible Secured Subordinated Promissory Note | Secured Debt | Director                            
Related Party Transaction [Line Items]                            
Debt instrument, interest rate, percentage                           10.75%
Face amount of debt                           $ 500,000
Conversion price (usd per share)                           $ 542.13
Additional Convertible Secured Subordinated Promissory Note | Secured Debt | Director                            
Related Party Transaction [Line Items]                            
Debt instrument, interest rate, percentage                         10.75%  
Face amount of debt                         $ 500,000