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Income Taxes - Additional Information (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Tax Examination [Line Items]      
Provision for federal or state income taxes $ 0 $ 0 $ 0
Remaining portion of net operating losses 824,000,000    
Gross unrecognized tax benefits 7,200,000 6,100,000  
Unrecognized interest or penalties 0 $ 0 $ 0
U.S. Federal and State      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 837,000,000    
U.S. Federal and State | Tax Year 2025 To 2037      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 238,000,000    
U.S. Federal and State | Indefinite      
Income Tax Examination [Line Items]      
Net operating loss carryforwards 599,000,000    
U.S. Federal Government      
Income Tax Examination [Line Items]      
US Federal tax credits carry forward 81,000,000    
Net operating loss for limited use 13,500,000    
U.S. Federal Government | Minimum      
Income Tax Examination [Line Items]      
Net operating losses limited for use utilized on an annual basis 200,000    
U.S. Federal Government | Maximum      
Income Tax Examination [Line Items]      
Net operating losses limited for use utilized on an annual basis $ 1,400,000