Balance Sheet Components - Prepaid Expense and Other Current Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid hardware and software maintenance		$ 4,034	$ 5,227
Receivables from employees		5,184	5,160
Other prepaid expenses and other current assets		22,728	20,331
Prepaid expenses and other current assets	[1]	$ 31,946	$ 30,718

[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the condensed consolidated balance sheets (see Note 11 - Portfolio Financings).