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Income Taxes - Summary (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Income Taxes        
Corporate tax rate (as a percent) 21.00% 21.00% 21.00%  
Federal | Net Operating Losses        
Income Taxes        
Net operating loss carryforwards $ 347.6     $ 194.0
Indefinite net operating loss carryforward 154.0      
Federal | Research and Development.        
Income Taxes        
Tax credit carryforwards 6.4      
State | Net Operating Losses        
Income Taxes        
Net operating loss carryforwards 116.0      
State | Research and Development.        
Income Taxes        
Tax credit carryforwards $ 1.9