Balance Sheet Components - Other Long-Term Assets (Details) - USD ($) $ in Thousands		Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018
Investment [Line Items]
Prepaid and other long-term assets		$ 23,574		$ 27,086
Equity-method investments		5,834		6,046
Long-term deposits		1,757		1,660
Other long-term assets	[1]	58,400		34,792
Diamond State Generation Partners, LLC
Investment [Line Items]
Equity-method investments		$ 27,235	$ 27,766	$ 0

[1] We have variable interest entities which represent a portion of the consolidated balances are recorded within the "Cash and cash equivalents," "Restricted cash," "Accounts receivable," "Customer financing receivable," "Prepaid expenses and other current assets," "Property and equipment, net," "Customer financing receivable, non-current," "Restricted cash, non-current," "Other long-term assets," "Accounts payable," "Accrued other current liabilities," "Deferred revenue and customer deposits," "Current portion of non-recourse debt from related parties," "Derivative liabilities, net of current portion," "Deferred revenue and customer deposits, net of current portion," "Long-term portion of non-recourse debt," and "Other long-term liabilities" financial statement line items in the Condensed Consolidated Balance Sheets (see Note 12 - Power Purchase Agreement Programs).