Short-term Investments - Unrealized Gain (Loss) on Short-Term Investments (Details) - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 216,365	$ 267,716
Unrealized Gain	1,204	1,032
Unrealized (Loss)	0	(24)
Short-term investments	217,569	268,724
U.S. treasury securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	205,922	239,297
Unrealized Gain	1,101	970
Unrealized (Loss)	0	(11)
Short-term investments	207,023	240,256
U.S. agency securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		15,000
Unrealized Gain		0
Unrealized (Loss)		(7)
Short-term investments		14,993
Asset-backed securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	10,443	10,438
Unrealized Gain	103	62
Unrealized (Loss)	0	0
Short-term investments	$ 10,546	10,500
Corporate debt securities
Debt Securities, Available-for-sale [Line Items]
Amortized Cost		2,981
Unrealized Gain		0
Unrealized (Loss)		(6)
Short-term investments		$ 2,975