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Available-for-Sale-Securities - Summary (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Cost	$ 30,750	$ 22,766
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(13)	(1)
Estimated Fair Value	30,737	22,768
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	8,406	11,673
Gross Unrealized Gains	0	3
Gross Unrealized Losses	(7)	(1)
Estimated Fair Value	8,399	11,675
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cost	7,591	11,093
Gross Unrealized Gains	0
Gross Unrealized Losses
Estimated Fair Value	7,591	11,093
Municipal debt securities
Debt Securities, Available-for-sale [Line Items]
Cost	14,753	0
Gross Unrealized Gains	0	0
Gross Unrealized Losses	(6)	0
Estimated Fair Value	$ 14,747	$ 0

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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