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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Jun. 30, 2019
Sep. 30, 2018
Accrued expenses        
Warranty $ 745,896 $ 854,952 $ 723,194 $ 854,952
Salary, benefits and payroll taxes     336,186 143,183
Professional fees     159,591 203,823
Other     193,608 261,063
Total accrued expenses     $ 1,412,579 $ 1,463,021
Warranty cost and accrual information        
Warranty accrual, beginning of period 745,896 854,952    
Release of accrual, net (664) (64,123)    
Warranty cost (22,038) (67,635)    
Warranty accrual, end of period $ 723,194 $ 723,194