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Cash and Marketable Securities (Narrative) (Details) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Amortized cost of securities |  |  |  |  | $ 7,000,000
Fair value of securities |  |  |  |  | $ 7,000,000
Marketable securities, realized gain (loss) |  |  | $ (3,000,000) |  |
Unrealized losses on marketable securities | $ 0 | $ 0 |  | $ 0 |
Gross unrealized gains of securities | 0 | 0 | 0 | 0 |
Gross unrealized losses of securities | 0 | 0 | 0 | 0 |
Proceeds from sale of available-for-sale securities | 0 | $ 0 | 0 | 0 |
Maturities of available-for-sale securities |  |  | $ 9,000,000 | $ 9,000,000 |
Maximum [Member] |  |  |  |  |
Marketable securities, maturity term |  |  | 1 year |  |
Amortized cost of securities | 1,000,000 |  | $ 1,000,000 |  |
Fair value of securities | $ 1,000,000 |  | $ 1,000,000 |  |

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