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6. INCOME TAXES (Details) (USD $) | Sep. 30, 2012 | Sep. 30, 2011
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Income Taxes Details |  |
Net operating loss carryforwards | $ 56,664,358 | $ 51,381,945
R&D credit | 2,258,838 | 2,340,614
Stock-based compensation | 2,455,231 | 1,597,790
Vacation and other | 193,163 | 190,522
Deferred rent | 1,278,863 | 991,091
Litigation liability |  | 1,842,297
Total deferred tax assets | 62,850,453 | 58,344,259
Derivative gain | (4,681,855) | (3,639,050)
Depreciation | (51,980) | (76,841)
Total deferred tax liabilities | (4,733,835) | (3,715,891)
Valuation allowance | (58,116,618) | (54,628,368)
Net deferred tax asset | $ 0 | $ 0

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