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Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Income Taxes [Abstract]    
U.S. federal statutory income tax rate 34.00% 34.00%
Fair value of derivative liabilities 3.60% 8.00%
Foreign rate differential (4.40%) (1.50%)
Stock-based compensation (1.00%) (0.60%)
State taxes, net of federal benefit (1.70%) (3.80%)
Australia refundable R&D tax offset (2.40%) (5.20%)
Goodwill impairment   (13.20%)
Effect of change in federal tax rate (184.20%)  
Change in reserve of uncertain tax positions   (10.70%)
Change in valuation allowance 170.90% (3.50%)
All other (5.60%) (0.60%)
Effective income tax rate 9.20% 2.90%