Marketable Securities and Fair Value Measurements - Schedule of Marketable Securities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Total
Amortized Cost	$ 240,787	$ 425,395
Gross Unrealized Gains	2	64
Gross Unrealized Losses	(268)	(51)
Estimated Fair Value	240,521	425,408
Commercial paper
Due within one year:
Amortized Cost	105,433	62,037
Gross Unrealized Gains	1	9
Gross Unrealized Losses	44	15
Estimated Fair Value	105,390	62,031
Total
Estimated Fair Value	105,390	62,031
U.S. government securities
Due within one year:
Amortized Cost	8,008	298,335
Gross Unrealized Gains	0	49
Gross Unrealized Losses	0	1
Estimated Fair Value	8,008	298,383
Due after one year through five years:
Amortized Cost	5,094	9,370
Gross Unrealized Gains	0	5
Gross Unrealized Losses	(18)	0
Estimated Fair Value	5,076	9,375
Total
Estimated Fair Value	13,084	307,758
Certificates of deposit
Due within one year:
Amortized Cost	23,528	17,344
Gross Unrealized Gains	1	1
Gross Unrealized Losses	7	1
Estimated Fair Value	23,522	17,344
Total
Estimated Fair Value	23,522	17,344
Corporate debt securities
Due within one year:
Amortized Cost	61,721	38,309
Gross Unrealized Gains	0	0
Gross Unrealized Losses	70	34
Estimated Fair Value	61,651	38,275
Due after one year through five years:
Amortized Cost	37,003
Gross Unrealized Gains	0
Gross Unrealized Losses	(129)
Estimated Fair Value	36,874
Total
Estimated Fair Value	$ 98,525	$ 38,275