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Fair Value Measurements - Recurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Financial Assets
Marketable securities	$ 566,408	$ 619,916
Money market funds
Financial Assets
Marketable securities	210,881	203,519
U.S. Treasuries
Financial Assets
Marketable securities	91,672	123,933
Commercial paper
Financial Assets
Marketable securities	63,142	89,687
Corporate notes/bonds
Financial Assets
Marketable securities	67,809	76,078
Recurring
Financial Assets
Total financial assets	570,285	623,793
Recurring | Money market funds
Financial Assets
Cash and cash equivalents	210,881	203,519
Restricted cash	3,877	3,877
Recurring | U.S. Treasuries
Financial Assets
Marketable securities	91,672	123,933
Recurring | Government agency securities
Financial Assets
Marketable securities	132,904	126,699
Recurring | Commercial paper
Financial Assets
Marketable securities	63,142	89,687
Recurring | Corporate notes/bonds
Financial Assets
Marketable securities	67,809	76,078
Recurring | Level 1
Financial Assets
Total financial assets	306,430	331,329
Recurring | Level 1 | Money market funds
Financial Assets
Cash and cash equivalents	210,881	203,519
Restricted cash	3,877	3,877
Recurring | Level 1 | U.S. Treasuries
Financial Assets
Marketable securities	91,672	123,933
Recurring | Level 2
Financial Assets
Total financial assets	263,855	292,464
Recurring | Level 2 | Government agency securities
Financial Assets
Marketable securities	132,904	126,699
Recurring | Level 2 | Commercial paper
Financial Assets
Marketable securities	63,142	89,687
Recurring | Level 2 | Corporate notes/bonds
Financial Assets
Marketable securities	$ 67,809	$ 76,078

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