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Income Taxes (Narrative) (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Increase (decrease) in valuation allowance $ 25.0 $ 2.7  
Internal Revenue Service I R S [Member]      
Net operating loss carryforwards 166.2   $ 104.9
Internal Revenue Service I R S [Member] | Research [Member]      
Tax credit carryforwards $ 1.3    
Internal Revenue Service I R S [Member] | Minimum [Member]      
Expiration year Dec. 31, 2021    
Internal Revenue Service I R S [Member] | Minimum [Member] | Research [Member]      
Expiration year Dec. 31, 2022    
Internal Revenue Service I R S [Member] | Maximum [Member]      
Expiration year Dec. 31, 2037    
Internal Revenue Service I R S [Member] | Maximum [Member] | Research [Member]      
Expiration year Dec. 31, 2035    
State And Local Jurisdiction [Member]      
Net operating loss carryforwards $ 261.4    
State And Local Jurisdiction [Member] | Research [Member]      
Tax credit carryforwards $ 2.2    
State And Local Jurisdiction [Member] | Minimum [Member]      
Expiration year Dec. 31, 2028    
State And Local Jurisdiction [Member] | Maximum [Member]      
Expiration year Dec. 31, 2040