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Investments (Summary of Available-for-sale Investments) (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 511	$ 511
Gross Unrealized Gains	152	152
Gross Unrealized Losses	0	0
Fair Value	663	663
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	511	511
Gross Unrealized Gains	152	152
Gross Unrealized Losses	0	0
Fair Value	$ 663	$ 663

X

- Definition

Amount, before tax, of unrealized gain in accumulated other comprehensive income (AOCI) on 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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