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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

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