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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Cost	$ 12,220	$ 18,104
Unrealized Gains	0	0
Unrealized Losses	(37)	(16)
Fair Value	12,183	18,088
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	3,791	5,893
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	3,791	5,893
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	6,001	9,276
Unrealized Gains	0	0
Unrealized Losses	(8)	(9)
Fair Value	5,993	9,267
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	2,428	2,935
Unrealized Gains	0	0
Unrealized Losses	(29)	(7)
Fair Value	$ 2,399	$ 2,928

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- 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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