Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)	3 Months Ended
	Dec. 31, 2018	Dec. 31, 2018	Sep. 30, 2018
Accrued expenses
Warranty	$ 854,952	$ 837,317	$ 854,952
Salary, benefits and payroll taxes		314,563	143,183
Professional fees		271,204	203,823
Other		326,604	261,063
Total accrued expenses		$ 1,749,688	$ 1,463,021
Warranty cost and accrual information
Warranty accrual, beginning of period	854,952
Accrued expense	2,600
Warranty cost	(20,235)
Warranty accrual, end of period	$ 837,317