Balance Sheet Components - Other Long-Term Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid insurance		$ 10,112	$ 11,792
Deferred commissions		7,039	6,732
Long-term lease receivable		7,797	6,995
Goodwill		1,719	0
Prepaid and other long-term assets		11,926	8,992
Other long-term assets	[1]	$ 38,593	$ 34,511

[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).