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Composition Of Certain Financial Statement Captions - Schedule of Other Income and Expense, Net (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disaggregation of Revenue [Line Items] |  |  |
Interest income from significant financing components | $ 892,020 | $ 280,067 | $ 406,133
Interest income from investments | 1,338 | 2,359 | 1,074
Realized and unrealized gain (loss) on marketable equity securities | (707) | 10 | (2,217)
Other income | 1,122 | 897 | 2,066
Other income and expense, net | 4,455 | 9,028 | 8,595
Financing |  |  |
Disaggregation of Revenue [Line Items] |  |  |
Interest income from significant financing components | $ 2,702 | $ 5,762 | $ 7,672

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