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Summary of Significant Accounting Policies - Identifiable Intangible Assets (Details)
12 Months Ended
Dec. 31, 2020
Minimum  
Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful life 1 year
Maximum  
Finite-Lived Intangible Assets [Line Items]  
Intangible assets estimated useful life 15 years