Annual report pursuant to Section 13 and 15(d)

Income Taxes (Narrative) (Details)

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Income Taxes (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Income Tax Disclosure [Line Items]        
Statutory income tax (benefit) expense 21.00% 21.00% 21.00%  
Gross deferred tax asset $ 40,538 $ 43,945    
Valuation allowance 22,348 28,632 $ 42,122 $ 45,811
Net deferred tax asset 18,190 15,313    
Deferred tax liabilities, gross 8,304 8,633    
Net change in valuation allowance (6,284) (13,490) $ (3,689)  
Net operating loss carryforwards for U.S. federal income tax purposes 120,309      
Research and experimentation credit carryforwards 1,889      
Unrecognized tax benefits that would impact effective tax rate 427 561    
Unrecognized tax benefits that reduce deferred tax assets $ 292 462    
Total accrued interest and penalties   $ 4    
Minimum [Member]        
Income Tax Disclosure [Line Items]        
Foreign statutory tax rate, foreign operations 25.00%