Balance Sheet Components - Accrued Other Current Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Jan. 01, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Compensation and benefits	$ 28,343			$ 17,173
Current portion of derivative liabilities	19,116			4,834
Sales-related liabilities	14,479			416
Accrued installation	16,468			10,348
Sales tax liabilities	2,732			3,849
Interest payable	2,224			3,875
Other	28,642			29,789
Accrued other current liabilities	$ 112,004	[1]	$ 68,970	$ 70,284	[1]

[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).