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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2016
Jun. 30, 2016
Sep. 30, 2015
Accrued expenses        
Warranty $ 996,660 $ 878,901 $ 950,432 $ 878,901
Salary, benefits and payroll taxes     451,910 537,451
Professional fees     689,453 353,012
Other, including losses on contracts     204,102 799,167
Total accrued expenses     2,295,897 2,568,531
EDC program costs     $ 0 $ 600,000
Warranty cost and accrual information        
Warranty accrual, beginning of period 996,660 878,901    
Accrued expense 35,890 308,200    
Warranty cost (82,118) (236,669)    
Warranty accrual, end of period $ 950,432 $ 950,432