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Balance Sheet Components Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Tax related receivables | $ 50,866 | $ 41,252
Current promissory note and related interest receivable | 27,914 | 25,005
Current promissory note 1 | 4,262 | 4,428
Other prepaid expenses and current assets | 29,182 | 7,128
Other current receivables | 19,624 | 24,637
Total prepaid expenses and other current assets | $ 131,848 | $ 102,450

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