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Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Income Taxes [Abstract]    
U.S. federal statutory income tax rate 34.00% 34.00%
Warrant liability and preferred stock conversion liability 573.80% (54.90%)
Difference in foreign vs U.S. statutory rates (21.80%)  
Stock option forfeitures & expirations (138.20%)  
State taxes, net of federal benefit   3.70%
Non-deductible stock issuance costs (17.90%)  
R&D expenses associated with Australian research grants 27.80%  
Effect of tax rate changes 12.40%  
All other (2.90%) 1.00%
Subtotal 467.20% (16.20%)
Change in valuation allowance (454.80%) 16.20%
Effective income tax rate 12.40% 0.00%