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Marketable Investments - Summary of Company's marketable investments (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 17,024
Gross Unrealized Gains	0
Gross Unrealized Losses	(6)
Market value	17,018
Corporate obligations
Debt Securities, Available-for-sale [Line Items]
Amortized cost	17,024
Gross Unrealized Gains	0
Gross Unrealized Losses	(6)
Market value	$ 17,018

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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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