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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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of cash inflow from maturity, prepayment and call of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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The cash inflow associated with the sale of debt and equity securities classified as available-for-sale securities.

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