Fair Value Measurements - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
Assets
Short-term investments	$ 228,833	$ 268,724
Fair Value, Measurements, Recurring
Assets
Total assets measured at fair value	983,700	1,127,309
Level 1 | Fair Value, Measurements, Recurring
Assets
Total assets measured at fair value	893,357	1,098,841
Level 2 | Fair Value, Measurements, Recurring
Assets
Total assets measured at fair value	90,343	28,468
Level 3 | Fair Value, Measurements, Recurring
Assets
Total assets measured at fair value	0	0
Money market funds | Fair Value, Measurements, Recurring
Assets
Cash equivalents	479,130	627,983
Money market funds | Level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	479,130	627,983
Money market funds | Level 2 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0	0
Money market funds | Level 3 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0	0
U.S. treasury bills | Fair Value, Measurements, Recurring
Assets
Cash equivalents	198,796	230,602
U.S. treasury bills | Level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	198,796	230,602
U.S. treasury bills | Level 2 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0	0
U.S. treasury bills | Level 3 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0	0
Commercial paper | Fair Value, Measurements, Recurring
Assets
Cash equivalents	13,980
Commercial paper | Level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
Commercial paper | Level 2 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	13,980
Commercial paper | Level 3 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
Corporate debt securities | Fair Value, Measurements, Recurring
Assets
Cash equivalents	38,621
Short-term investments	2,997	2,975
Corporate debt securities | Level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
Short-term investments	0	0
Corporate debt securities | Level 2 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	38,621
Short-term investments	2,997	2,975
Corporate debt securities | Level 3 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
Short-term investments	0	0
Certificate of deposits | Fair Value, Measurements, Recurring
Assets
Cash equivalents	24,340
Certificate of deposits | Level 1 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
Certificate of deposits | Level 2 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	24,340
Certificate of deposits | Level 3 | Fair Value, Measurements, Recurring
Assets
Cash equivalents	0
U.S. treasury securities | Fair Value, Measurements, Recurring
Assets
Short-term investments	215,431	240,256
U.S. treasury securities | Level 1 | Fair Value, Measurements, Recurring
Assets
Short-term investments	215,431	240,256
U.S. treasury securities | Level 2 | Fair Value, Measurements, Recurring
Assets
Short-term investments	0	0
U.S. treasury securities | Level 3 | Fair Value, Measurements, Recurring
Assets
Short-term investments	0	0
U.S. agency securities | Fair Value, Measurements, Recurring
Assets
Short-term investments		14,993
U.S. agency securities | Level 1 | Fair Value, Measurements, Recurring
Assets
Short-term investments		0
U.S. agency securities | Level 2 | Fair Value, Measurements, Recurring
Assets
Short-term investments		14,993
U.S. agency securities | Level 3 | Fair Value, Measurements, Recurring
Assets
Short-term investments		0
Asset-backed securities | Fair Value, Measurements, Recurring
Assets
Short-term investments	10,405	10,500
Asset-backed securities | Level 1 | Fair Value, Measurements, Recurring
Assets
Short-term investments	0	0
Asset-backed securities | Level 2 | Fair Value, Measurements, Recurring
Assets
Short-term investments	10,405	10,500
Asset-backed securities | Level 3 | Fair Value, Measurements, Recurring
Assets
Short-term investments	$ 0	$ 0