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Marketable Securities - Proceeds From Maturities of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Investments, Debt and Equity Securities [Abstract]
Proceeds from marketable securities	$ 7,500	$ 9,650	$ 17,405	$ 22,560
Sales of marketable securities	1,464	0	1,464	0
Total	$ 8,964	$ 9,650	$ 18,869	$ 22,560

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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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Amount of cash inflow from sale, 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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