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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
3 Months Ended 6 Months Ended
Mar. 31, 2020
Mar. 31, 2020
Mar. 31, 2020
Sep. 30, 2019
Accrued expenses        
Warranty $ 573,412 $ 573,412 $ 573,412 $ 606,680
Salary, benefits and payroll taxes     272,306 212,322
Professional fees     106,464 153,298
Operating lease     81,899  
Other     142,984 138,618
Total accrued expenses     $ 1,177,065 $ 1,110,918
Warranty cost and accrual information        
Warranty accrual, beginning of period 559,180 606,680    
Accrued expense 63,777 40,975    
Warranty cost (49,545) (74,243)    
Warranty accrual, end of period $ 573,412 $ 573,412