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Income Taxes (Details 2) (USD $) | Dec. 31, 2013 | Dec. 31, 2012
--- | --- | ---
Deferred tax assets: |  |
Stock-based compensation | $ 1,152,904 | $ 859,095
Net operating loss carryforwards | 10,041,416 | 9,216,044
Employee benefits | 59,505 | 38,927
Alternative-minimum tax credit carryforwards | 0 | 17,635
Research and development tax credits | 410,490 | 1,210,405
Other deductible temporary differences | 0 | 280,872
Total gross deferred tax assets | 11,664,315 | 11,622,978
Less valuation allowance | (11,660,247) | (11,619,578)
Net deferred tax assets | 4,068 | 3,400
Deferred tax liabilities: |  |
Plant and equipment | (4,068) | (3,400)
Total gross deferred tax liabilities | (4,068) | (3,400)
Net deferred tax liabilities | $ 0 | $ 0

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