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Income Taxes - Deferred tax assets and liabilities component (Details) - USD ($)
Sep. 30, 2016
Sep. 30, 2015
Non current deferred tax assets:    
Reserves and accruals $ 2,539,117 $ 3,321,257
Research and development credit 1,742,627 1,472,421
NOL carryforward - state 1,206,476 1,200,156
Depreciation (725,018) (741,736)
Stock options 603,881 678,316
Other   897
Gross non current deferred tax assets 5,367,083 5,931,311
Less : Valuation allowance (5,297,757) (5,371,528)
Total deferred tax assets 69,326 559,783
Non current deferred tax liabilities:    
Depreciation (137,027) (133,468)
Total deferred tax liabilities (137,027) (133,468)
Net deferred tax liability $ (67,701)  
Net deferred tax asset   $ 426,315