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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
3 Months Ended 9 Months Ended
Jun. 30, 2018
Jun. 30, 2018
Jun. 30, 2018
Sep. 30, 2017
Accrued expenses        
Warranty $ 930,458 $ 1,013,461 $ 893,914 $ 1,013,461
Salary, benefits and payroll taxes     387,783 258,688
Professional fees     145,677 219,331
Reduction in workforce / Severance     259,348  
Other     213,052 268,557
Total accrued expenses     $ 1,899,774 $ 1,760,037
Warranty cost and accrual information        
Warranty accrual, beginning of period 930,458 1,013,461    
Accrued expense 1,368 9,070    
Warranty cost (37,912) (128,617)    
Warranty accrual, end of period $ 893,914 $ 893,914