Balance Sheet Components - Prepaid Expense and Other Current 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]
Government incentives receivable	$ 893						$ 1,001
Prepaid HW & SW maintenance	3,763						1,464
Receivables from employees	6,130						5,922
Other prepaid expense and other current assets	17,282						28,360
Total	$ 28,068	[1]	$ 28,642	$ 26,483	$ 30,073	$ 36,887	$ 36,747	[1]	$ 36,499	$ 24,820	$ 28,944

[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).