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Supplemental Balance Sheet Disclosures - Accrued Expenses (Details) - USD ($)	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Mar. 31, 2019	Mar. 31, 2019	Sep. 30, 2018
Accrued expenses
Warranty	$ 837,317	$ 854,952	$ 745,896	$ 854,952
Salary, benefits and payroll taxes			179,417	143,183
Professional fees			122,137	203,823
Other			411,639	261,063
Total accrued expenses			$ 1,459,089	$ 1,463,021
Warranty cost and accrual information
Warranty accrual, beginning of period	837,317	854,952
Accrued expense	(66,058)	(63,458)
Warranty cost	(25,363)	(45,598)
Warranty accrual, end of period	$ 745,896	$ 745,896

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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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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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Amount of expenses incurred but not yet paid classified as other, due within one year or 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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