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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
 3 Months Ended 9 Months Ended
Jun. 30, 2017
Jun. 30, 2017
Jun. 30, 2017
Sep. 30, 2016
Accrued expenses        
Warranty $ 1,054,499 $ 1,009,368 $ 1,036,950 $ 1,009,368
Salary, benefits and payroll taxes     468,612 267,323
Professional fees     272,370 308,905
Other, including losses on contracts     177,099 304,312
Total accrued expenses     1,955,031 1,889,908
EDC program costs     $ 20,000 $ 77,000
Warranty cost and accrual information        
Warranty accrual, beginning of period 1,054,499 1,009,368    
Accrued expense 28,168 171,737    
Warranty cost (45,717) (144,155)    
Warranty accrual, end of period $ 1,036,950 $ 1,036,950