Balance Sheet Account Details Prepaid expenses and other current assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Prepaid Expense and Other Assets, Current [Abstract]
Other receivables	$ 22,978	$ 7,857
Prepaid expenses	10,150	4,568
Income taxes receivable	0	2,560
Other	1,886	1,885
Total prepaid expenses and other current assets	$ 35,014	$ 16,870