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Summary of Significant Accounting Policies - Allowance for Doubtful Accounts and Credit Memo Reserves (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Accounts Receivable, Allowance for Credit Loss [Roll Forward]  
Balance as of December 31, 2020 $ 56,981
Credit memos charged to revenue 13,026
Allowance for bad debts charged to expense 9,850
Deductions and other (19,114)
Balance as of March 31, 2021 $ 60,743