Cash Equivalents and Marketable Securities - Cash Equivalents and Marketable Securities (Details) - USD ($) $ in Thousands	Jun. 30, 2022	Dec. 31, 2021
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	$ 285,584	$ 318,713
Total cash equivalents and marketable securities, Gross Unrealized Losses	(450)	(143)
Total cash equivalents and marketable securities, Fair Value	285,134	318,570
U.S. Treasury and agency securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	94,873	40,093
Total cash equivalents and marketable securities, Gross Unrealized Losses	(368)	(76)
Total cash equivalents and marketable securities, Fair Value	94,505	40,017
Corporate debt securities
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	16,540	75,598
Total cash equivalents and marketable securities, Gross Unrealized Losses	(47)	(50)
Total cash equivalents and marketable securities, Fair Value	16,493	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	38,082	39,854
Total cash equivalents and marketable securities, Fair Value	38,082	39,854
Commercial Paper
Cash Equivalents and Marketable Securities
Total cash equivalents and marketable securities, Amortized Cost	136,089	157,157
Total cash equivalents and marketable securities, Gross Unrealized Losses	(35)	(16)
Total cash equivalents and marketable securities, Fair Value	$ 136,054	$ 157,141