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Summary of Significant Accounting Policies (Tables)
9 Months Ended
Sep. 30, 2021
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents The following table provides a reconciliation of cash, cash equivalents and restricted cash to the balances shown in the unaudited condensed consolidated statements of cash flows:
(In thousands)September 30, 2021December 31, 2020September 30, 2020
Cash and cash equivalents$1,253,706 $1,517,361 $865,609 
Restricted cash12,696 11,154 8,926 
Total cash, cash equivalents and restricted cash$1,266,402 $1,528,515 $874,535 
Schedule of Accounts Receivable and Prepaid Expense and Other Current Assets Allowance for Doubtful Accounts The following table illustrates the activity in the Company's allowance for doubtful accounts:
(In thousands)Balance as of
December 31, 2020
Increases (decreases) to
Costs and
Expenses
Write-Offs
Net of
Recoveries
Balance as of
September 30, 2021
Allowance for doubtful accounts -
within accounts receivable, net
$20,350 $(4,149)$(2,100)$14,101 
Allowance for doubtful accounts -
within prepaid expenses and other current assets
$7,029 $— $— $7,029 
Schedule of Customer Refund Liability and Inventory Associated with the Reserves The following table presents the customer refund liability, as well as the associated value of inventory for the periods indicated:
(In thousands)Balance as of
September 30, 2021
Balance as of
December 31, 2020
Balance as of
September 30, 2020
Customer refund liability$174,274 $203,399 $197,496 
Inventory associated with the reserves$50,544 $57,867 $50,779