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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
3 Months Ended
Dec. 31, 2019
Dec. 31, 2019
Sep. 30, 2019
Accrued expenses      
Warranty $ 559,180 $ 559,180 $ 606,680
Salary, benefits and payroll taxes   362,025 212,322
Professional fees   314,054 153,298
Operating lease   84,368  
Other   94,418 138,618
Total accrued expenses   $ 1,414,045 $ 1,110,918
Warranty cost and accrual information      
Warranty accrual, beginning of period 606,680    
Release of accrual, net (22,801)    
Warranty cost (24,699)    
Warranty accrual, end of period $ 559,180