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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