Short-term Investments - Unrealized Gain (Loss) on Investments (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 267,716	$ 447,827
Unrealized Gain	1,032	47
Unrealized Loss	(24)	(7,016)
Estimated Fair Value	268,724	440,858
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	239,297	384,951
Unrealized Gain	970	0
Unrealized Loss	(11)	(6,949)
Estimated Fair Value	240,256	378,002
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	15,000	29,012
Unrealized Gain	0	47
Unrealized Loss	(7)	0
Estimated Fair Value	14,993	29,059
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		28,815
Unrealized Gain		0
Unrealized Loss		0
Estimated Fair Value		28,815
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,438
Unrealized Gain	62
Unrealized Loss	0
Estimated Fair Value	10,500
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	2,981	5,049
Unrealized Gain	0	0
Unrealized Loss	(6)	(67)
Estimated Fair Value	$ 2,975	$ 4,982