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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 18,104
Unrealized Gains	0
Unrealized Losses	(16)
Fair Value	18,088
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	5,893
Unrealized Gains	0
Unrealized Losses	0
Fair Value	5,893
Cash
Debt Securities, Available-for-sale [Line Items]
Cost		$ 1,712
Unrealized Gains		0
Unrealized Losses		0
Fair Value		$ 1,712
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	9,276
Unrealized Gains	0
Unrealized Losses	(9)
Fair Value	9,267
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	2,935
Unrealized Gains	0
Unrealized Losses	(7)
Fair Value	$ 2,928

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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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