Balance Sheet Components - Accrued Other Current Liabilities (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]
Compensation and benefits	$ 17,173						$ 16,742
Current portion of derivative liabilities	4,834						3,232
Sales related liabilities	416		$ 10,420	$ 10,027	$ 8,819		1,421		$ 7,780	$ 6,792	$ 6,556
Accrued installation	10,348						6,859
Sales tax liabilities	3,849						1,798
Interest payable	3,875						4,675
Other	29,789						32,111
Accrued other current liabilities	$ 70,284	[1]	$ 79,616	$ 105,393	$ 64,073	$ 66,838	$ 66,838	[1]	$ 63,986	$ 49,932	$ 53,654

[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).