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6. INCOME TAXES Net deferred tax asset (Details) - USD ($) | Sep. 30, 2015 | Sep. 30, 2014
--- | --- | ---
Income Taxes Net Deferred Tax Asset Details |  |
Net operating loss carryforwards | $ 61,363,080 | $ 55,229,799
R&D credit | 1,221,487 | 1,221,487
Stock-based compensation | 5,854,794 | 4,054,450
Fixed assets and intangibles | 41,018 | 26,329
Capitalized R&D | 15,081,545 | 9,897,041
Vacation and other | 114,625 | 108,891
Loan modification | 56,779 | 0
Total deferred tax assets | 83,733,328 | 70,537,997
Valuation allowance | (83,733,328) | (705,379,977)
Net deferred tax asset | $ 0 | $ 0

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