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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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- Definition Represents the non-current portion of deferred tax assets attributable to federal and state operating loss carryforwards, before allocation of valuation allowances. + References No definition available. + Details
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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and carryforwards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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