Balance Sheet Components - Prepaid Expense and Other Current Assets (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Government incentives receivable		$ 479	$ 893
Prepaid hardware and software maintenance		5,227	3,763
Receivables from employees		5,160	6,130
Other prepaid expenses and other current assets		19,852	17,282
Prepaid Expense and Other Assets, Current	[1]	$ 30,718	$ 28,068

[1] We have variable interest entities, which represent a portion of the consolidated balances recorded within these financial statement line items in the consolidated balance sheets (see Note 13 - Portfolio Financings).