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Income Taxes - Reconciliation of Income Tax Rate Federal Statutory Rate and Effective Tax Rate (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]    
U. S. federal statutory tax rate (35.00%) (35.00%)
Stock-based compensation 27.50%
Change in valuation allowance 31.10% 7.60%
Amortization of warrant discounts 4.00%
Fair value of stock options issued in payment of debt 0.50%
Other (0.10%) (0.60%)
Effective tax rate 0.00% 0.00%