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Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Income Taxes [Abstract]    
U.S. federal statutory income tax rate 34.00% 34.00%
Warrant liability and preferred stock conversion liability 8.00% 573.80%
Difference in foreign vs U.S. statutory rates (1.50%) (21.80%)
Stock option forfeitures & expirations (0.60%) (138.20%)
State taxes, net of federal benefit (3.80%)  
Non-deductible stock issuance costs (1.00%) (17.90%)
R&D expenses associated with Australian research grants (5.20%) 27.80%
Effect of tax rate changes 0.30% 12.40%
Goodwill impairment (13.20%)  
Change in reserve of uncertain tax positions (10.70%)  
All other 0.10% (2.90%)
Subtotal 6.40% 467.20%
Change in valuation allowance (3.50%) (454.80%)
Effective income tax rate 2.90% 12.40%