The Company and Summary of Significant Accounting Policies - Customer Accounts and Funds Receivable (Details)	Jun. 30, 2021 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Credit-related loss	$ 0

Amount of allowance for credit loss on financing receivable. Excludes allowance for financing receivable covered under loss sharing agreement.

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Name:	us-gaap_FinancingReceivableAllowanceForCreditLosses
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant