Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	$ 262,165	$ 318,713
Total cash equivalents and marketable securities, Gross Unrealized Gains	15
Total cash equivalents and marketable securities, Gross Unrealized Losses	(146)	(143)
Total cash equivalents and marketable securities, Fair Value	262,034	318,570
U.S. Treasury and agency securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	118,365	40,093
Total cash equivalents and marketable securities, Gross Unrealized Gains	15
Total cash equivalents and marketable securities, Gross Unrealized Losses	(126)	(76)
Total cash equivalents and marketable securities, Fair Value	118,254	40,017
Corporate debt securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	6,328	75,598
Total cash equivalents and marketable securities, Gross Unrealized Losses	(8)	(50)
Total cash equivalents and marketable securities, Fair Value	6,320	75,548
Supranational and sovereign government securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost		6,011
Total cash equivalents and marketable securities, Gross Unrealized Losses		(1)
Total cash equivalents and marketable securities, Fair Value		6,010
Money Market Funds
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	39,234	39,854
Total cash equivalents and marketable securities, Fair Value	39,234	39,854
Commercial Paper
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	98,238	157,157
Total cash equivalents and marketable securities, Gross Unrealized Losses	(12)	(16)
Total cash equivalents and marketable securities, Fair Value	$ 98,226	$ 157,141