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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)
 3 Months Ended
Dec. 31, 2016
Dec. 31, 2016
Sep. 30, 2016
Accrued expenses      
Warranty $ 1,009,368 $ 1,025,442 $ 1,009,368
Salary, benefits and payroll taxes   375,418 267,323
Professional fees   408,528 308,905
Other, including losses on contracts   436,766 304,312
Total accrued expenses   2,246,154 1,889,908
EDC program costs   $ 0 $ 100,000
Warranty cost and accrual information      
Warranty accrual, beginning of period 1,009,368    
Accrued expense 66,970    
Warranty cost (50,896)    
Warranty accrual, end of period $ 1,025,442