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Income Taxes - Net Operating Loss Carryforwards (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Taxes    
Net operating loss carryforwards $ 88,800,000  
Valuation allowance 4,452,000 $ 6,202,700
Income tax (expense) benefit $ 0 $ 0