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Company and Summary of Significant Accounting Policies - Intangible Assets (Details) - USD ($)
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Impairment of Intangible assets    
Finite-Lived Intangible Assets [Line Items]    
Asset impairment charges $ 0 $ 0
Minimum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 12 months  
Maximum [Member]    
Finite-Lived Intangible Assets [Line Items]    
Useful life (in years) 60 months