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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Jun. 30, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 23,054
Unrealized Gains	0
Unrealized Losses	(4)
Fair Value	23,050
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	13,475	$ 5,889
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	13,475	$ 5,889
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	6,094
Unrealized Gains	0
Unrealized Losses	(3)
Fair Value	6,091
Long-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	3,485
Unrealized Gains	0
Unrealized Losses	(1)
Fair Value	$ 3,484

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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