Fair Value Measurements (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Financial Assets
Marketable securities:	$ 446,414	$ 437,371
Government agency securities
Financial Assets
Marketable securities:	170,207	159,357
Corporate notes/bonds
Financial Assets
Marketable securities:	37,812	56,883
Commercial paper
Financial Assets
Marketable securities:	12,587	29,816
U.S. Treasuries
Financial Assets
Marketable securities:	143,271	49,793
Fair Value, Recurring
Financial Assets
Total financial assets	450,291	441,248
Fair Value, Recurring \| Government agency securities
Financial Assets
Marketable securities:	170,207	159,357
Fair Value, Recurring \| Corporate notes/bonds
Financial Assets
Marketable securities:	37,812	56,883
Fair Value, Recurring \| Commercial paper
Financial Assets
Marketable securities:	12,587	29,816
Fair Value, Recurring \| U.S. Treasuries
Financial Assets
Marketable securities:	143,271	49,793
Fair Value, Recurring \| Money market funds
Financial Assets
Cash equivalents:	82,537	141,522
Restricted cash and other non-current assets:	$ 3,877	$ 3,877
Restricted cash and cash equivalents, statement of financial position [extensible enumeration]	Restricted cash and other non-current assets	Restricted cash and other non-current assets
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1)
Financial Assets
Total financial assets	$ 229,685	$ 195,192
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Government agency securities
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Corporate notes/bonds
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Commercial paper
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| U.S. Treasuries
Financial Assets
Marketable securities:	143,271	49,793
Fair Value, Recurring \| Quoted Prices in Active Markets for Identical Assets (Level 1) \| Money market funds
Financial Assets
Cash equivalents:	82,537	141,522
Restricted cash and other non-current assets:	$ 3,877	$ 3,877
Restricted cash and cash equivalents, statement of financial position [extensible enumeration]	Restricted cash and other non-current assets	Restricted cash and other non-current assets
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2)
Financial Assets
Total financial assets	$ 220,606	$ 246,056
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Government agency securities
Financial Assets
Marketable securities:	170,207	159,357
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Corporate notes/bonds
Financial Assets
Marketable securities:	37,812	56,883
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Commercial paper
Financial Assets
Marketable securities:	12,587	29,816
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| U.S. Treasuries
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Significant Other Observable Inputs (Level 2) \| Money market funds
Financial Assets
Cash equivalents:	0	0
Restricted cash and other non-current assets:	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3)
Financial Assets
Total financial assets	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Government agency securities
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Corporate notes/bonds
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Commercial paper
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| U.S. Treasuries
Financial Assets
Marketable securities:	0	0
Fair Value, Recurring \| Significant Unobservable Inputs (Level 3) \| Money market funds
Financial Assets
Cash equivalents:	0	0
Restricted cash and other non-current assets:	$ 0	$ 0

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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