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Marketable Securities - Proceeds From Maturities of Available-For-Sale Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Investments, Debt and Equity Securities [Abstract]
Maturities of marketable securities	$ 1,900	$ 3,999	$ 7,495	$ 21,404
Sales of marketable securities	1,805	0	1,805	1,464
Total	$ 3,705	$ 3,999	$ 9,300	$ 22,868

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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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