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Income Taxes - Operating loss carry forwards (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Net operating loss carry forwards    
Net operating loss carry forward $ 7.5 $ 6.4
Valuation allowance 42.1 28.6
increase in valuation allowance 12.1  
Foreign    
Net operating loss carry forwards    
Net operating loss carryforward, not subject to expiration 27.2  
Net operating loss carryforward, subject to expiration 1.3  
Operating loss carryforward 27.2  
Tax credit carryforward 34.4 $ 32.7
Austrian Operations    
Net operating loss carry forwards    
Operating loss carryforward 27.2  
Korean Operations    
Net operating loss carry forwards    
Operating loss carryforward 3.8  
U.S.    
Net operating loss carry forwards    
Capital loss carry forward 1.0  
Domestic    
Net operating loss carry forwards    
Net operating loss carryforward, subject to expiration 2.5  
Operating loss carryforward 3.8  
Capital loss carry forward $ 1.0