Balance Sheet Components Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Notes To Financial Statements [Abstract]
Tax related receivables	$ 55,162	$ 41,252
Current promissory note and related interest receivable	13,598	7,128
Current promissory note	14,552	25,005
Other current receivables	25,264	29,065
Total prepaid expenses and other current assets	$ 108,576	$ 102,450

Amount, before allowance for credit loss, of financing receivable, classified as current.

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