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Available-for-Sale-Securities - Schedule of Available-for-Sale Securities Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 102,226	$ 30,750
Gross Unrealized Gains	5	0
Gross Unrealized Losses	(23)	(13)
Estimated Fair Value	102,208	30,737
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	53,287	8,406
Gross Unrealized Gains	4	0
Gross Unrealized Losses	(17)	(7)
Estimated Fair Value	53,274	8,399
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost	7,922	7,591
Gross Unrealized Gains	0	0
Gross Unrealized Losses	0	0
Estimated Fair Value	7,922	7,591
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	41,017	14,753
Gross Unrealized Gains	1	0
Gross Unrealized Losses	(6)	(6)
Estimated Fair Value	$ 41,012	$ 14,747

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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