Balance Sheet Components - Other Long-Term Assets (Details) - USD ($) $ in Thousands	Dec. 31, 2019		Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018		Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Prepaid and other long-term assets	$ 29,153						$ 34,093
Deferred commissions	5,007						1,083
Equity-method investments	5,733						6,046
Long-term deposits	1,759						1,660
Other long-term assets	$ 41,652	[1]	$ 70,951	$ 72,836	$ 45,447	$ 45,354	$ 42,882	[1]	$ 44,397	$ 45,241	$ 43,179

[1] We have variable interest entities which represent a portion of the consolidated balances are recorded within these financial statement line items in the Consolidated Balance Sheets (see Note 13, Power Purchase Agreement Programs).