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Significant Accounting Policies - Software Costs (Details) - Capitalized software - Maximum
12 Months Ended
Dec. 31, 2020
Intangible assets  
Amortization period 3 years
Cost of sales  
Intangible assets  
Amortization period 3 years
SG&A expense  
Intangible assets  
Amortization period 3 years