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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Mar. 31, 2018	Sep. 30, 2017
Accrued expenses
Warranty	$ 926,965	$ 1,013,461	$ 930,458	$ 1,013,461
Salary, benefits and payroll taxes			228,494	258,688
Professional fees			220,824	219,331
Other			175,083	268,557
Total accrued expenses			$ 1,554,859	$ 1,760,037
Warranty cost and accrual information
Warranty accrual, beginning of period	926,965	1,013,461
Accrued expense	33,961	7,702
Warranty cost	(30,468)	(90,705)
Warranty accrual, end of period	$ 930,458	$ 930,458

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for professional fees, such as for legal and accounting services received. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Total of the carrying values as of the balance sheet date of obligations incurred through that date and payable for obligations related to services received from employees, such as accrued salaries and bonuses, payroll taxes and fringe benefits. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Carrying value as of the balance sheet date of obligations incurred through that date and payable for estimated claims under standard and extended warranty protection rights granted to customers. For classified balance sheets, represents the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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