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Supplementary Balance Sheet Information - Investments Available-for-sale (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 120,866
Gross Unrealized Gains	25
Gross Unrealized Losses	(9)
Fair Market Value	120,882
Certificate of deposit
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,609
Gross Unrealized Gains	1
Gross Unrealized Losses	0
Fair Market Value	2,610
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	77,901
Gross Unrealized Gains	15
Gross Unrealized Losses	(6)
Fair Market Value	77,910
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,434
Gross Unrealized Gains	4
Gross Unrealized Losses	(2)
Fair Market Value	12,436
Non U.S. government
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	732
Gross Unrealized Gains	0
Gross Unrealized Losses	0
Fair Market Value	732
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	27,190
Gross Unrealized Gains	5
Gross Unrealized Losses	(1)
Fair Market Value	$ 27,194

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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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