Investments - Summary (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	$ 1,027,032	$ 1,078,709
Gross unrealized gains	2	163
Gross unrealized losses	(5,256)	(615)
Estimated fair value	1,021,778	1,078,257
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	191,505	236,170
Gross unrealized gains	2	36
Gross unrealized losses	(1,416)	(248)
Estimated fair value	$ 190,091	$ 235,958
Corporate debt securities \| Maximum
Debt Securities, Available-for-sale [Line Items]
Maturity	2 years	2 years
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	$ 548,407	$ 621,947
Gross unrealized gains	0	127
Gross unrealized losses	(1,623)	(95)
Estimated fair value	$ 546,784	$ 621,979
Commercial paper \| Maximum
Debt Securities, Available-for-sale [Line Items]
Maturity	1 year	1 year
U.S. Agency bonds
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	$ 21,000	$ 58,092
Gross unrealized gains	0	0
Gross unrealized losses	(6)	0
Estimated fair value	$ 20,994	$ 58,092
U.S. Agency bonds \| Maximum
Debt Securities, Available-for-sale [Line Items]
Maturity	1 year	1 year
U.S. Treasury bills
Debt Securities, Available-for-sale [Line Items]
Debt Securities, Available-for-sale, Amortized Cost, Total	$ 266,120	$ 162,500
Gross unrealized gains	0	0
Gross unrealized losses	(2,211)	(272)
Estimated fair value	$ 263,909	$ 162,228
U.S. Treasury bills \| Maximum
Debt Securities, Available-for-sale [Line Items]
Maturity	2 years	2 years

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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