Investments and Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022
Assets:
Short-term investments	$ 525,960	$ 377,312
U.S. treasury securities
Assets:
Short-term investments	74,167	9,757
Corporate debt securities
Assets:
Short-term investments	207,533	157,517
Recurring Basis
Assets:
Total cash equivalents	205,642	556,064
Short-term investments	525,960	377,312
Total	731,602	933,376
Recurring Basis | Level 1
Assets:
Total cash equivalents	205,642	530,674
Short-term investments	74,167	9,757
Total	279,809	540,431
Recurring Basis | Level 2
Assets:
Total cash equivalents	0	25,390
Short-term investments	451,793	367,555
Total	451,793	392,945
Recurring Basis | Level 3
Assets:
Total cash equivalents	0	0
Short-term investments	0	0
Total	0	0
Recurring Basis | U.S. treasury securities
Assets:
Short-term investments	74,167	9,757
Recurring Basis | U.S. treasury securities | Level 1
Assets:
Short-term investments	74,167	9,757
Recurring Basis | U.S. treasury securities | Level 2
Assets:
Short-term investments	0	0
Recurring Basis | U.S. treasury securities | Level 3
Assets:
Short-term investments	0	0
Recurring Basis | U.S. government agency securities
Assets:
Short-term investments	226,044	96,652
Recurring Basis | U.S. government agency securities | Level 1
Assets:
Short-term investments	0	0
Recurring Basis | U.S. government agency securities | Level 2
Assets:
Short-term investments	226,044	96,652
Recurring Basis | U.S. government agency securities | Level 3
Assets:
Short-term investments	0	0
Recurring Basis | Commercial paper
Assets:
Short-term investments	18,216	113,386
Recurring Basis | Commercial paper | Level 1
Assets:
Short-term investments	0	0
Recurring Basis | Commercial paper | Level 2
Assets:
Short-term investments	18,216	113,386
Recurring Basis | Commercial paper | Level 3
Assets:
Short-term investments	0	0
Recurring Basis | Corporate debt securities
Assets:
Short-term investments	207,533	157,517
Recurring Basis | Corporate debt securities | Level 1
Assets:
Short-term investments	0	0
Recurring Basis | Corporate debt securities | Level 2
Assets:
Short-term investments	207,533	157,517
Recurring Basis | Corporate debt securities | Level 3
Assets:
Short-term investments	0	0
Recurring Basis | Money market funds
Assets:
Total cash equivalents	205,642	530,674
Recurring Basis | Money market funds | Level 1
Assets:
Total cash equivalents	205,642	530,674
Recurring Basis | Money market funds | Level 2
Assets:
Total cash equivalents	0	0
Recurring Basis | Money market funds | Level 3
Assets:
Total cash equivalents	$ 0	0
Recurring Basis | Commercial paper
Assets:
Total cash equivalents		25,390
Recurring Basis | Commercial paper | Level 1
Assets:
Total cash equivalents		0
Recurring Basis | Commercial paper | Level 2
Assets:
Total cash equivalents		25,390
Recurring Basis | Commercial paper | Level 3
Assets:
Total cash equivalents		$ 0