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Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($)
Sep. 30, 2017
Sep. 30, 2016
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)