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INCOME TAXES (Details 1) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Deferred tax assets (liabilities): |  |
Net operating loss carryforwards | $ 50,029,000 | $ 73,864,000
General business credit carryforwards | 3,227,000 | 2,557,000
State credits | 3,089,000 | 3,089,000
Property, equipment and goodwill | (28,000) | (23,000)
Stock options | 5,122,000 | 6,450,000
Derivatives | (57,000) | (92,000)
Deferred revenue | 778,000 | 1,464,000
Intangible assets | 379,000 | 228,000
Accrued interest | 156,000 | 253,000
Other | 143,000 | 231,000
Gross deferred tax assets | 62,838,000 | 88,021,000
Valuation allowance | (62,838,000) | (88,021,000)
Net deferred taxes | $ 0 | $ 0

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