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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Income Tax Contingency [Line Items]          
Federal tax at statutory rate   34.00% 34.00% 34.00%  
Reduction to federal deferred tax assets   $ 29,480      
Corporate alternative minimum tax, deferred tax benefit   102      
Research and development credit carryforward   5,339 $ 5,446    
Pre-tax book loss for domestic operations   (19,409) (27,271) $ (21,157)  
Pre-tax book loss for international operations   (7,469) (6,027) (6,019)  
Undistributed earnings of foreign subsidiaries   107      
Unrecognized deferred tax assets   2,816 2,816    
Deferred tax assets tax credit carryforwards research and unrecognized tax benefits reduction from IRS audit   2,018      
Unrecognized tax benefits that would impact effective tax rate   0 0 0  
Unrecognized tax benefits   1,157 $ 3,175 $ 1,982 $ 1,982
Scenario, Plan [Member]          
Income Tax Contingency [Line Items]          
Federal tax at statutory rate 21.00%        
Federal [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward   240,286      
Research and development credit carryforward   6,392      
State [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward   147,841      
Foreign [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward   $ 30,501      
Minimum [Member] | Federal [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2021      
Research and development credit credit carryforwards expiration year   Dec. 31, 2022      
Minimum [Member] | State [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2018      
Minimum [Member] | Foreign [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2018      
Maximum [Member] | Federal [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2038      
Research and development credit credit carryforwards expiration year   Dec. 31, 2038      
Maximum [Member] | State [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2038      
Maximum [Member] | Foreign [Member]          
Income Tax Contingency [Line Items]          
Operating loss carryforward, expiration year   Dec. 31, 2027