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Fair Value Measurement - Marketable Securities (Details) $ in Thousands	Sep. 30, 2021 USD ($)
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	$ 305,939
Gross Unrealized Gains	24
Gross Unrealized Losses	(9)
Estimated Fair Value	305,954
Cash and cash equivalents
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	25,597
Estimated Fair Value	25,597
Short-term marketable securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	245,169
Gross Unrealized Gains	20
Gross Unrealized Losses	(6)
Estimated Fair Value	245,183
Long-term marketable securities
Debt Securities, Available-for-sale, Fair Value to Amortized Cost [Abstract]
Amortized Cost	35,173
Gross Unrealized Gains	4
Gross Unrealized Losses	(3)
Estimated Fair Value	$ 35,174

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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