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Credit Arrangements - Other Indebtedness (Details) - USD ($)
May 17, 2018
Sep. 30, 2019
Sep. 30, 2018
Feb. 15, 2018
Jan. 19, 2018
Mitsui Sumitomo Bank [Member]          
Line of Credit Facility [Line Items]          
Annual interest rate   1.575%      
Mitsui Sumitomo Bank [Member] | Term Loan          
Line of Credit Facility [Line Items]          
Notes payable outstanding   $ 0 $ 264,000    
Director | Convertible Secured Subordinated Promissory Note | Secured Debt          
Line of Credit Facility [Line Items]          
Interest rate         10.75%
Face amount of debt         $ 500,000
Conversion price (usd per share)         $ 542.13
Director | Additional Convertible Secured Subordinated Promissory Note | Secured Debt          
Line of Credit Facility [Line Items]          
Interest rate       10.75%  
Face amount of debt       $ 500,000  
Series A Preferred Stock          
Line of Credit Facility [Line Items]          
Shares issued upon conversion (in shares) 1,902        
Conversion price (usd per share)   $ 4.23      
Series A Preferred Stock | Director | Convertible Secured Subordinated Promissory Note | Secured Debt          
Line of Credit Facility [Line Items]          
Shares issued upon conversion (in shares) 1,902        
Conversion price (usd per share) $ 542.13