Balance Sheet Components - Other Long-Term Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020		Jan. 01, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Delaware grant	$ 9,212			$ 10,469
Other	3,067			17,544
Other long-term liabilities	$ 12,279	[1]	$ 17,673	$ 28,013	[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).