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Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($) | Sep. 30, 2017 | Sep. 30, 2016
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Deferred tax assets: |  |
Reserves and accruals | $ 1,275,427 | $ 2,539,117
Research and development credit | 1,236,365 | 1,742,627
NOL carryforward - state | 1,208,592 | 1,206,476
Depreciation | (690,774) | (725,018)
Stock options | 609,016 | 603,881
Gross non current deferred tax assets | 3,638,626 | 5,367,083
Less : Valuation allowance | (3,568,459) | (5,297,757)
Total deferred tax assets | 70,167 | 69,326
Deferred tax liabilities: |  |
Depreciation | (137,909) | (137,027)
Total deferred tax liabilities | (137,909) | (137,027)
Net deferred tax liability | $ (67,742) | $ (67,701)

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