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Income Taxes - Schedule of Effective Income Tax Rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
U. S. federal statutory tax rate (34.00%) (34.00%)
Non-deductible stock-based compensation 0.00% 0.50%
Non-deductible fair value of warrant extensions 0.40% 3.60%
Non-deductible fair value of warrant discounts 2.00% 1.60%
Expirations related to stock-based compensation 3.30% 5.00%
Adjustment to deferred tax asset 0.00% (1.00%)
Change in valuation allowance 28.30% 24.30%
Effective tax rate 0.00% 0.00%