Balance Sheet Components - Prepaid Expense and Other Current Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2020		Dec. 31, 2019		Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Government incentives receivable	$ 839		$ 893
Prepaid production insurance	3,961		3,763
Receivables from employees	6,653		6,130
Other prepaid expenses and other current assets	13,541		17,282
Total	$ 24,994	[1]	$ 28,068	[1]	$ 30,073

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