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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) $ in Thousands	Jun. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 129,480
Gross Unrealized Gains	16
Gross Unrealized Losses	(26)
Fair Market Value	129,470
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	1,739
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Market Value	1,740
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	87,689
Gross Unrealized Gains	10
Gross Unrealized Losses	(21)
Fair Market Value	87,678
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,780
Gross Unrealized Gains	3
Gross Unrealized Losses	(1)
Fair Market Value	12,782
Non U.S. government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	737
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Market Value	737
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	26,535
Gross Unrealized Gains	2
Gross Unrealized Losses	(4)
Fair Market Value	$ 26,533

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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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