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Fair Value of Financial Instruments - Schedule of Estimated Fair Values of Financial Instruments Outstanding (Details) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale [Line Items]
Cost	$ 11,140
Unrealized Gains	0
Unrealized Losses	(1)
Fair Value	11,139
Cash and Cash Equivalents
Debt Securities, Available-for-sale [Line Items]
Cost	9,529	$ 5,889
Unrealized Gains	0	0
Unrealized Losses	0	0
Fair Value	9,529	$ 5,889
Short-term investments
Debt Securities, Available-for-sale [Line Items]
Cost	1,611
Unrealized Gains	0
Unrealized Losses	(1)
Fair Value	$ 1,610

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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