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Organization and Summary of Accounting Policies - CARES ACT (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Proceeds from grants received $ 59.0    
Grant funds 46.2 $ 0.0 $ 0.0
Accelerated payments 120.0    
Accelerated payments, current portion 95.0    
Deferred accrued payroll and benefits $ 16.9