Marketable Securities - Investments In Marketable Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Debt Securities, Available-for-sale [Line Items]
Short-term marketable securities, amortized cost basis	$ 267,040	$ 275,754
Short-term marketable securities, gross unrealized losses	(1,227)	(414)
Short-term marketable securities, fair value	265,813	275,340
Long-term marketable securities, amortized cost basis	33,084	64,596
Long-term marketable securities, gross unrealized losses	(360)	(200)
Long-term marketable securities, fair value	32,724	64,396
U.S. Treasury notes
Debt Securities, Available-for-sale [Line Items]
Short-term marketable securities, amortized cost basis	188,665	226,136
Short-term marketable securities, gross unrealized losses	(527)	(344)
Short-term marketable securities, fair value	188,138	225,792
Long-term marketable securities, amortized cost basis	11,040	0
Long-term marketable securities, gross unrealized losses	(72)	0
Long-term marketable securities, fair value	10,968	0
U.S. Government-sponsored enterprise securities
Debt Securities, Available-for-sale [Line Items]
Short-term marketable securities, amortized cost basis	78,375	49,618
Short-term marketable securities, gross unrealized losses	(700)	(70)
Short-term marketable securities, fair value	77,675	49,548
Long-term marketable securities, amortized cost basis	22,044	64,596
Long-term marketable securities, gross unrealized losses	(288)	(200)
Long-term marketable securities, fair value	$ 21,756	$ 64,396