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Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($)	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2016
Deferred tax assets:
Reserves and accruals	$ 730,015	$ 1,275,427	$ 2,539,117
Research and development credit	1,318,977	1,236,365	1,742,627
NOL carryforward - fed/state	2,982,246	1,208,592	1,206,476
Depreciation	(863,796)	(690,774)	(725,018)
Stock options	345,608	609,016	603,881
Gross non current deferred tax assets	4,513,050	3,638,626	5,367,083
Less : Valuation allowance	(4,296,553)	(3,568,459)	(5,297,757)
Total deferred tax assets	216,497	70,167	69,326
Deferred tax liabilities:
Depreciation	(346,091)	(137,909)	(137,027)
Total deferred tax liabilities	(346,091)	(137,909)	(137,027)
Net deferred tax asset (liability)	$ (129,594)	$ (67,742)	$ (67,701)

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from depreciation.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards.

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Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from share-based compensation.

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Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

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