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Income Taxes (Details 2) - USD ($)
Dec. 31, 2015
Dec. 31, 2014
Deferred tax assets:    
Stock-based compensation $ 1,713,608 $ 1,851,668
Net operating loss carryforwards 23,677,332 17,479,654
Employee benefits 59,472 41,568
Research and development tax credits 2,052,662 1,419,165
Orphan Drug Tax Credits 485,789 0
Other deductible tempory differences 215,638 97,656
Total gross deferred tax assets 28,204,501 20,889,711
Less valuation allowance (28,200,857) (20,886,811)
Net deferred tax assets 3,644 2,900
Deferred tax liabilities:    
Plant and equipment (3,644) (2,900)
Total gross deferred tax liabilities (3,644) (2,900)
Net deferred tax liabilities $ 0 $ 0