Balance Sheet Components - Accrued Other Current Liabilities (Details) - USD ($) $ in Thousands		Sep. 30, 2021	Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Compensation and benefits		$ 24,393	$ 28,343
Current portion of derivative liabilities		12,415	19,116
Sales-related liabilities		6,232	14,479
Accrued installation		8,854	16,468
Sales tax liabilities		1,304	2,732
Interest payable		719	2,224
Other		31,960	28,642
Accrued other current liabilities	[1]	$ 85,877	$ 112,004

[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).