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Significant Accounting Policies - Intangible Assets (Details)
12 Months Ended
Dec. 31, 2020
Maximum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 20 years
Minimum [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Asset, Useful Life 4 years