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Investments and Fair Value Measurements - Cash, Cash Equivalent and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021	Sep. 30, 2021
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	$ 87,897	$ 166,068	$ 282,131
Marketable securities, current	445,048	361,795
Marketable securities, non-current	186,066	528,911
Total marketable securities	631,114	890,706
Total cash, cash equivalents and marketable securities	719,011	1,056,774
U.S. Treasury securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	327,868	184,946
Marketable securities, non-current	0	239,528
Total marketable securities	327,868	424,475
Corporate notes and bonds
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	84,342	11,327
Marketable securities, non-current	152,773	197,298
Total marketable securities	237,115	208,625
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	6,498	124,089
Total marketable securities	6,498	124,089
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	6,464	21,576
Marketable securities, non-current	31,077	77,142
Total marketable securities	37,541	98,717
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	0	2,250
Total marketable securities	2,216	4,562
Municipal securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, non-current	2,216	2,312
Foreign government and supranational securities
Debt Securities, Available-for-sale [Line Items]
Marketable securities, current	19,876	17,607
Marketable securities, non-current	0	12,631
Total marketable securities	19,876	30,238
Cash
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	42,673	134,774
Money market funds
Debt Securities, Available-for-sale [Line Items]
Cash and cash equivalents:	$ 45,224	$ 31,294

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