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Summary of Significant Accounting Policies - Accounts Receivable and Current Expected Credit Losses and Concentration of Credit Risk and Deferred Revenue and Customer Deposits (Details)
3 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Customer One | Accounts Receivable    
Concentration Risk [Line Items]    
Concentration risk percentage 12.00% 11.00%