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Income Taxes (Reconciliation of Statutory to Effective Income Tax Rate) (Details)
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Income Taxes [Abstract]    
U.S. federal statutory income tax rate 21.00% 34.00%
Fair value of derivative liabilities 0.20% 3.60%
Foreign rate differential 0.30% (4.40%)
Stock-based compensation (0.30%) (1.00%)
State taxes, net of federal benefit 0.30% (1.70%)
Australia refundable R&D tax offset (4.60%) (2.40%)
NOL and credit expiration (20.30%)  
Effect of change in federal tax rate (0.30%) (184.20%)
Change in reserve of uncertain tax positions 3.20%  
Change in valuation allowance 3.40% 170.90%
All other (0.10%) (5.60%)
Effective income tax rate 2.80% 9.20%