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Other Balance Sheet Components - Prepaid Expenses and Other Current Assets (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
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Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |
Down payments to manufacturing vendors | $ 216,538 | $ 0
Prepaid expenses | 15,647 | 8,475
Tenant incentives receivables | 10,242 | 4,093
Interest receivable on marketable securities | 9,725 | 6,835
Prepaid expenses and other current assets | $ 252,152 | $ 19,403

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