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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2021
Mar. 31, 2021
Sep. 30, 2020
Accrued expenses        
Warranty $ 579,011 $ 579,011 $ 579,011 $ 547,743
Salary, benefits and payroll taxes     313,204 483,797
Professional fees     101,424 151,956
Operating lease     5,637 45,126
Other     259,734 133,338
Total accrued expenses     $ 1,259,010 $ 1,361,960
Warranty cost and accrual information        
Warranty accrual, beginning of period 578,172 547,743    
Accrued expense 27,960 101,826    
Warranty cost (27,121) (70,558)    
Warranty accrual, end of period $ 579,011 $ 579,011